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LogiGrain

payment-readyonline

payment-ready until 2026-11-21

Exact calculation tools for AI agents, paid per call with x402 (0.001 USDC on Base).

Call it x402 v2

x402 v2

Base URL
https://logigrain.net
Payment
x402 v2, header channel
$ curl -i 'https://logigrain.net/api/code'

An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.

Endpoints 19 paid routes on logigrain.net

GET/api/codeBase$0.001since 11-07
GET/api/compoundBase$0.001since 11-07
GET/api/convertBase$0.001since 11-07
GET/api/convert-unitBase$0.001since 11-07
GET/api/dateBase$0.001since 11-07
GET/api/eraBase$0.001since 11-07
GET/api/feedBase$0.001since 11-07
GET/api/housing-loanBase$0.001since 11-07

11 more in Example 402 response

Prices as captured in the 402 response: median $0.001 across the 19 endpoints.

Example 402 response

Endpoints and prices

Current paid endpoints; minimum quoted prices in USD where available; first capture dates in UTC
MethodPathDescriptionPriceNetworkAsset402 channelCaptured
GET/api/codeSyntax check for JSON, HTML and CSS snippets.$0.001BaseUSDCheadersince 11-07
GET/api/compoundCompound interest with optional monthly contributions.$0.001BaseUSDCheadersince 11-07
GET/api/convertCurrency conversion using live exchange rates (cached 60 s).$0.001BaseUSDCheadersince 11-07
GET/api/convert-unitUnit conversion: length, weight, speed, data, area, volume, energy, temperature.$0.001BaseUSDCheadersince 11-07
GET/api/dateDate difference, add days, Unix timestamp conversion, weekday count.$0.001BaseUSDCheadersince 11-07
GET/api/eraJapanese era (wareki: 令和/平成/昭和/大正/明治) to Gregorian and back, with real-date and era-start validation, plus Japanese fiscal year.$0.001BaseUSDCheadersince 11-07
GET/api/feedLive forex rates or crypto prices (cached).$0.001BaseUSDCheadersince 11-07
GET/api/housing-loanJapan mortgage tax deduction (住宅ローン控除) for move-ins 2026-2030 (FY2026 reform): borrowing limit and 13/10-year period by home type, performance class, special household and floor area; yearly deduction or a full-period projection from a loan, split between income and resident tax. Refuses older move-ins; asks for missing facts. Checked against National Tax Agency tax answers and an independent implementation.$0.001BaseUSDCheadersince 11-07
GET/api/jsonJSON validate, format or minify, with key count and depth.$0.001BaseUSDCheadersince 11-07
GET/api/kyuseiNine Star Ki (九星気学): main star and monthly star with solar-term boundaries computed astronomically (within about 15 minutes, 1900-2150), Japan time.$0.001BaseUSDCheadersince 07-01
GET/api/mathSafe math expression evaluation (no code execution): functions, constants, variables.$0.001BaseUSDCheadersince 11-07
GET/api/moonMoon phase from a true ephemeris: age, illumination, phase name (Japanese/English), next full and new moon date and time (within about 2 minutes), timezone aware.$0.001BaseUSDCheadersince 11-07
GET/api/nenkinJapanese public pension estimate (老齢基礎年金) using official parameters for the current fiscal year (FY2026 full amount 847,300 yen): exemptions, early claim/deferral rates, fuka-nenkin. Returns the rule year used and a quotable sentence; asks for the contribution record instead of guessing; warns when parameters are stale.$0.001BaseUSDCheadersince 11-07
GET/api/nenkin-deferralWhen to start the Japanese public pension: break-even age of early claim or deferral versus a baseline, probability of living to that age from the official Japanese life table (令和7年簡易生命表, by sex), and expected lifetime total for each start age 60-75. Returns the rule year used, assumptions, what would change the answer, and a quotable sentence. Totals cross-checked by an independent implementation.$0.001BaseUSDCheadersince 11-07
GET/api/nisaJapan new NISA limits: how much can still be bought this year and next year under the annual limits (つみたて 1.2M / 成長 2.4M yen) and the 18M-yen lifetime book-value limit (成長 up to 12M). Selling frees the book value (cost), not the sale price, from the next year. Returns the rule basis, assumptions, what would change the answer and a quotable sentence; asks for book values instead of guessing. Rules checked against the FSA NISA site.$0.001BaseUSDCheadersince 11-07
GET/api/probabilityBayes theorem, exact combinations and permutations (big-integer exact result).$0.001BaseUSDCheadersince 11-07
GET/api/seiyoWestern astrology natal chart (西洋占星術): Sun-Neptune longitudes and signs, ASC/MC, Placidus and whole-sign houses, aspects. Verified against Swiss Ephemeris (planets mostly within 0.03 deg, cusps within 0.01 deg, 1950-2024).$0.001BaseUSDCheadersince 07-01
GET/api/shibuZi Wei Dou Shu (紫微斗数) natal chart: lunar date, 命宮/身宮, 五行局, 14 major stars, auxiliary and malefic stars, 四化, 大限, optional 流年. Lunar-new-year boundary; documented leap-month convention.$0.001BaseUSDCheadersince 07-01
GET/api/shichuFour Pillars / BaZi (四柱推命): year, month, day and hour pillars with solar-term boundaries in JST. Pillars cross-checked against an independent Chinese-calendar library on 3,000 random datetimes.$0.001BaseUSDCheadersince 07-01

Payment evidence

402 payload captured at . Check evidence JSON · Measurement methodology.

First of 19 payloads captured by the monitor.

109 lines, scroll inside

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/era",
    "mimeType": "application/json",
    "description": "Japanese era (wareki: 令和/平成/昭和/大正/明治) to Gregorian and back, with real-date and era-start validation, plus Japanese fiscal year."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "value": "2019-05-01",
            "action": "to_era"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "era": "令和",
            "iso": "2019-05-01",
            "input": "2019-05-01",
            "action": "to_era",
            "era_year": 1,
            "era_roman": "Reiwa",
            "formatted_kanji": "令和1年5月1日",
            "formatted_short": "R1.5.1"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "value"
                ],
                "properties": {
                  "value": {
                    "type": "string",
                    "description": "Era string (e.g. R6, 令和6) or ISO date (YYYY-MM-DD) depending on action"
                  },
                  "action": {
                    "type": "string",
                    "description": "Operation (default to_iso)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}
Other captured 402 responses (18)

Captured payload 2 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/json",
    "mimeType": "application/json",
    "description": "JSON validate, format or minify, with key count and depth."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "input": "{\"key\":\"value\"}",
            "action": "format"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "keys": 1,
            "size": "15 B",
            "type": "Object",
            "depth": 1,
            "valid": true,
            "action": "format",
            "result": "{\n  \"key\": \"value\"\n}"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "input"
                ],
                "properties": {
                  "input": {
                    "type": "string",
                    "description": "URL-encoded JSON string"
                  },
                  "action": {
                    "type": "string",
                    "description": "Operation to perform (default validate)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 3 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/math",
    "mimeType": "application/json",
    "description": "Safe math expression evaluation (no code execution): functions, constants, variables."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "expr": "sqrt(144)+2^10"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "expr": "sqrt(144)+2^10",
            "type": "Integer",
            "vars": {},
            "valid": true,
            "result": 1036
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "expr"
                ],
                "properties": {
                  "expr": {
                    "type": "string",
                    "description": "Math expression, e.g. sqrt(144)+2^10"
                  },
                  "vars": {
                    "type": "string",
                    "description": "Optional variables, comma-separated k=v pairs, e.g. x=3,y=4"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 4 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/kyusei",
    "mimeType": "application/json",
    "description": "Nine Star Ki (九星気学): main star and monthly star with solar-term boundaries computed astronomically (within about 15 minutes, 1900-2150), Japan time."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "date": "1982-06-20",
            "time": "10:30"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "kyusei": {
              "input": {
                "date": "1982-06-20",
                "time": "10:30",
                "timezone": "Asia/Tokyo"
              },
              "honmeisei": {
                "star": 9,
                "name_en": "Kyushi-Kasei",
                "name_ja": "九紫火星"
              },
              "getsumeisei": {
                "star": 1,
                "name_en": "Ippaku-Suisei",
                "name_ja": "一白水星"
              },
              "kigaku_year": 1982,
              "setsu_month": {
                "term_ja": "芒種",
                "term_start": "1982-06-06T09:33+09:00"
              }
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "date"
                ],
                "properties": {
                  "date": {
                    "type": "string",
                    "description": "Birth date YYYY-MM-DD (JST). Solar-term (立春/節入り) boundaries handled astronomically."
                  },
                  "time": {
                    "type": "string",
                    "description": "Birth time HH:MM (JST 24h, default 00:00). Matters only near solar-term boundaries."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 5 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/moon",
    "mimeType": "application/json",
    "description": "Moon phase from a true ephemeris: age, illumination, phase name (Japanese/English), next full and new moon date and time (within about 2 minutes), timezone aware."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "tz": "Asia/Tokyo",
            "date": "2026-10-15"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "moon": {
              "phase": "waxing_crescent",
              "method": "true ephemeris (Meeus ch.47 Moon + ch.25 apparent Sun); phase times within ~2...",
              "age_days": 3.97,
              "timezone": "Asia/Tokyo",
              "is_waxing": true,
              "timestamp": "2026-10-14T15:00:00.000Z",
              "days_to_new": 25.7,
              "days_to_full": 11.5,
              "next_new_moon": "2026-11-09",
              "phase_name_en": "Waxing Crescent",
              "phase_name_ja": "三日月",
              "elongation_deg": 45.82,
              "next_full_moon": "2026-10-26",
              "next_new_moon_time": "2026-11-09T16:02+09:00",
              "next_full_moon_time": "2026-10-26T13:11+09:00",
              "traditional_name_ja": "繊月(せんげつ)",
              "illumination_percent": 15.2
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "tz": {
                    "type": "string",
                    "description": "Timezone, fixed standard offset (default UTC)"
                  },
                  "date": {
                    "type": "string",
                    "description": "Reference date YYYY-MM-DD, interpreted as local midnight in tz (default now)"
                  },
                  "include": {
                    "type": "string",
                    "description": "Comma-separated extras, e.g. trivia"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 6 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/code",
    "mimeType": "application/json",
    "description": "Syntax check for JSON, HTML and CSS snippets."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "code": "{\"key\":\"value\"}",
            "lang": "json"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "lang": "json",
            "chars": 15,
            "lines": 1,
            "valid": true,
            "errors": []
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "lang",
                  "code"
                ],
                "properties": {
                  "code": {
                    "type": "string",
                    "description": "URL-encoded source code"
                  },
                  "lang": {
                    "type": "string",
                    "description": "Language to validate"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 7 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/feed",
    "mimeType": "application/json",
    "description": "Live forex rates or crypto prices (cached)."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "type": "forex",
            "symbols": "JPY,EUR"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "type"
                ],
                "properties": {
                  "base": {
                    "type": "string",
                    "description": "Base currency for forex (default USD)"
                  },
                  "type": {
                    "type": "string",
                    "description": "Feed type"
                  },
                  "symbols": {
                    "type": "string",
                    "description": "Comma-separated symbols (e.g. JPY,EUR or BTC,ETH,XLM)"
                  }
                }
              }
            },
            "additionalProperties": false
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 8 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/compound",
    "mimeType": "application/json",
    "description": "Compound interest with optional monthly contributions."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "rate": "7",
            "years": "20",
            "principal": "10000"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "gain": 28697,
            "inputs": {
              "rate": "7",
              "years": 20,
              "monthly": 0,
              "principal": 10000
            },
            "result": 38697,
            "invested": 10000,
            "multiplier": 3.87
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "principal",
                  "rate",
                  "years"
                ],
                "properties": {
                  "rate": {
                    "type": "string",
                    "description": "Annual interest rate in percent (e.g. 7 = 7%)"
                  },
                  "years": {
                    "type": "string",
                    "description": "Number of years"
                  },
                  "monthly": {
                    "type": "string",
                    "description": "Optional monthly contribution"
                  },
                  "principal": {
                    "type": "string",
                    "description": "Initial principal amount"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 9 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/seiyo",
    "mimeType": "application/json",
    "description": "Western astrology natal chart (西洋占星術): Sun-Neptune longitudes and signs, ASC/MC, Placidus and whole-sign houses, aspects. Verified against Swiss Ephemeris (planets mostly within 0.03 deg, cusps within 0.01 deg, 1950-2024)."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "tz": "9",
            "lat": "35.68",
            "lon": "139.77",
            "date": "1990-05-15",
            "time": "08:30"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "input": {
              "tz": 9,
              "day": 15,
              "lat": 35.68,
              "lon": 139.77,
              "hour": 8,
              "year": 1990,
              "month": 5,
              "minute": 30
            },
            "angles": {
              "IC": {
                "deg": 5.13,
                "sign": "Libra"
              },
              "MC": {
                "deg": 5.13,
                "sign": "Aries"
              },
              "ASC": {
                "deg": 19.91,
                "sign": "Cancer"
              },
              "DSC": {
                "deg": 19.91,
                "sign": "Capricorn"
              }
            },
            "aspects": [
              {
                "a": "Sun",
                "b": "Moon",
                "orb": 3.15,
                "type": "trine",
                "separation": 123.15
              },
              {
                "a": "Sun",
                "b": "Mars",
                "orb": 5.95,
                "type": "sextile",
                "separation": 65.95
              }
            ],
            "planets": {
              "Sun": {
                "sign": "Taurus",
                "longitude": 53.899,
                "deg_in_sign": 23.9,
                "house_whole": 11,
                "house_placidus": 11
              },
              "Moon": {
                "sign": "Capricorn",
                "longitude": 290.75,
                "deg_in_sign": 20.75,
                "house_whole": 7,
                "house_placidus": 7
              },
              "Mercury": {
                "sign": "Taurus",
                "longitude": 38.088,
                "deg_in_sign": 8.09,
                "house_whole": 11,
                "house_placidus": 10
              }
            },
            "julian_day": 2448026.4791666665
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "date"
                ],
                "properties": {
                  "tz": {
                    "type": "string",
                    "description": "UTC offset hours (default 9)"
                  },
                  "lat": {
                    "type": "string",
                    "description": "Latitude north (default 35.68)"
                  },
                  "lon": {
                    "type": "string",
                    "description": "Longitude east (default 139.77)"
                  },
                  "date": {
                    "type": "string",
                    "description": "Birth date YYYY-MM-DD"
                  },
                  "time": {
                    "type": "string",
                    "description": "Birth time HH:MM (default 12:00)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 10 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/shibu",
    "mimeType": "application/json",
    "description": "Zi Wei Dou Shu (紫微斗数) natal chart: lunar date, 命宮/身宮, 五行局, 14 major stars, auxiliary and malefic stars, 四化, 大限, optional 流年. Lunar-new-year boundary; documented leap-month convention."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "date": "1990-08-15",
            "time": "06:00",
            "gender": "male"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "shibu": {
              "input": {
                "date": "1990-08-15",
                "time": "06:00",
                "gender": "male",
                "time_provided": true,
                "lunar_basis_tz": "UTC+8"
              },
              "sihua": {
                "map": {
                  "化忌": "天同",
                  "化権": "武曲",
                  "化禄": "太陽",
                  "化科": "太陰"
                },
                "birth_year_stem": "庚"
              },
              "daxian": {
                "note": "Each 大限 spans 10 years; see per-palace 'daxian' field.",
                "direction": "順行"
              },
              "liunian": {
                "note": "Provide 'liunian' (year, e.g. 2026) to overlay the annual chart."
              },
              "palaces": [
                {
                  "stem": "戊",
                  "branch": "子",
                  "palace": "財帛宮",
                  "is_body_palace": false
                },
                {
                  "stem": "己",
                  "branch": "丑",
                  "palace": "子女宮",
                  "is_body_palace": false
                }
              ],
              "ming_gong": {
                "stem": "庚",
                "branch": "辰",
                "ganzhi": "庚辰"
              },
              "shen_gong": {
                "branch": "戌",
                "palace": "遷移宮"
              },
              "wuxing_ju": {
                "name": "金四局",
                "number": 4,
                "nayin_element": "金"
              },
              "lunar_date": {
                "day": 25,
                "year": 1990,
                "month": 6,
                "is_leap_year": true,
                "is_leap_month": false
              },
              "ziwei_star": "巳",
              "hour_branch": "卯",
              "tianfu_star": "亥",
              "birth_year_pillar": {
                "num": 6,
                "name": "庚午",
                "element": "metal",
                "stem_en": "Geng",
                "stem_ja": "庚",
                "branch_en": "Wu",
                "branch_ja": "午",
                "stem_branch_en": "Geng-Wu"
              }
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "date"
                ],
                "properties": {
                  "date": {
                    "type": "string",
                    "description": "Birth date YYYY-MM-DD. Lunar conversion uses China Standard Time (UTC+8) as the charting basis."
                  },
                  "time": {
                    "type": "string",
                    "description": "Birth time HH:MM (24h). Determines the 時辰 (two-hour branch); 23:00-23:59 counts as next day (夜子時)."
                  },
                  "gender": {
                    "type": "string",
                    "description": "male or female. Required to compute 大限 (10-year periods); chart is otherwise gender-independent."
                  },
                  "liunian": {
                    "type": "string",
                    "description": "Annual-chart year (e.g. 2026). When set, overlays 流年 stars and 流年四化 onto each palace."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 11 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/probability",
    "mimeType": "application/json",
    "description": "Bayes theorem, exact combinations and permutations (big-integer exact result)."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "n": "60",
            "r": "30",
            "type": "combination"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "n": 60,
            "r": 30,
            "type": "combination",
            "result": 118264581564861420,
            "formula": "C(n,r) = n! / (r!(n-r)!)",
            "result_exact": "118264581564861424",
            "exact_as_number": false
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "type"
                ],
                "properties": {
                  "n": {
                    "type": "string",
                    "description": "n, required for combination/permutation"
                  },
                  "r": {
                    "type": "string",
                    "description": "r, required for combination/permutation"
                  },
                  "pa": {
                    "type": "string",
                    "description": "P(A), required for bayes"
                  },
                  "pba": {
                    "type": "string",
                    "description": "P(B|A), required for bayes"
                  },
                  "pbna": {
                    "type": "string",
                    "description": "P(B|¬A), required for bayes"
                  },
                  "type": {
                    "type": "string",
                    "description": "Calculation type"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 12 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/convert",
    "mimeType": "application/json",
    "description": "Currency conversion using live exchange rates (cached 60 s)."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "to": "JPY",
            "from": "USD",
            "amount": "100"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "from",
                  "to"
                ],
                "properties": {
                  "to": {
                    "type": "string",
                    "description": "Target currency code, e.g. JPY"
                  },
                  "from": {
                    "type": "string",
                    "description": "Source currency code, e.g. USD"
                  },
                  "amount": {
                    "type": "string",
                    "description": "Amount to convert (default 1)"
                  }
                }
              }
            },
            "additionalProperties": false
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 13 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/shichu",
    "mimeType": "application/json",
    "description": "Four Pillars / BaZi (四柱推命): year, month, day and hour pillars with solar-term boundaries in JST. Pillars cross-checked against an independent Chinese-calendar library on 3,000 random datetimes."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "date": "1990-05-15",
            "time": "08:30"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "shichu": {
              "input": {
                "date": "1990-05-15",
                "time": "08:30",
                "timezone": "Asia/Tokyo",
                "time_provided": true
              },
              "day_master": "庚",
              "day_pillar": {
                "num": 16,
                "name": "庚辰",
                "element": "metal",
                "stem_en": "Geng",
                "stem_ja": "庚",
                "branch_en": "Chen",
                "branch_ja": "辰",
                "stem_branch_en": "Geng-Chen"
              },
              "hour_pillar": {
                "num": 16,
                "name": "庚辰",
                "element": "metal",
                "stem_en": "Geng",
                "stem_ja": "庚",
                "branch_en": "Chen",
                "branch_ja": "辰",
                "stem_branch_en": "Geng-Chen"
              },
              "setsu_month": {
                "term_ja": "立夏"
              },
              "year_pillar": {
                "num": 6,
                "name": "庚午",
                "element": "metal",
                "stem_en": "Geng",
                "stem_ja": "庚",
                "branch_en": "Wu",
                "branch_ja": "午",
                "stem_branch_en": "Geng-Wu"
              },
              "month_pillar": {
                "num": 17,
                "name": "辛巳",
                "element": "metal",
                "stem_en": "Xin",
                "stem_ja": "辛",
                "branch_en": "Si",
                "branch_ja": "巳",
                "stem_branch_en": "Xin-Si"
              },
              "day_master_en": "Geng",
              "meishiki_year": 1990,
              "day_pillar_zi_shifted": {
                "num": 16,
                "name": "庚辰",
                "element": "metal",
                "stem_en": "Geng",
                "stem_ja": "庚",
                "branch_en": "Chen",
                "branch_ja": "辰",
                "stem_branch_en": "Geng-Chen"
              },
              "hour_pillar_zi_shifted": {
                "num": 16,
                "name": "庚辰",
                "element": "metal",
                "stem_en": "Geng",
                "stem_ja": "庚",
                "branch_en": "Chen",
                "branch_ja": "辰",
                "stem_branch_en": "Geng-Chen"
              }
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "date"
                ],
                "properties": {
                  "date": {
                    "type": "string",
                    "description": "Birth date YYYY-MM-DD (JST). Year/month pillars use 立春/節入り boundaries (astronomical)."
                  },
                  "time": {
                    "type": "string",
                    "description": "Birth time HH:MM (JST 24h). Required for the hour pillar; also affects 子-hour day-pillar shift."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 14 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/nisa",
    "mimeType": "application/json",
    "description": "Japan new NISA limits: how much can still be bought this year and next year under the annual limits (つみたて 1.2M / 成長 2.4M yen) and the 18M-yen lifetime book-value limit (成長 up to 12M). Selling frees the book value (cost), not the sale price, from the next year. Returns the rule basis, assumptions, what would change the answer and a quotable sentence; asks for book values instead of guessing. Rules checked against the FSA NISA site."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "sale_price": "1500000",
            "held_growth": "5000000",
            "sold_growth": "1000000",
            "bought_growth": "1000000",
            "held_tsumitate": "3000000",
            "bought_tsumitate": "600000"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "nisa": {
              "basis": {
                "url": "https://www.fsa.go.jp/policy/nisa2/",
                "year": 2026,
                "rules": "2024年1月施行の新NISA(2026年10月時点で確認)",
                "source": "金融庁 NISA特設ウェブサイト(新しいNISA:年間投資枠・非課税保有限度額・簿価残高方式、よくある質問)",
                "as_of_date": "2026-10-19"
              },
              "next_year": {
                "year": 2027,
                "can_buy": {
                  "growth": 2400000,
                  "tsumitate": 1200000,
                  "combined_max": 3600000
                },
                "lifetime_remaining": 10000000,
                "lifetime_used_book": 8000000,
                "growth_lifetime_remaining": 7000000,
                "recovered_from_sales_book": 1000000
              },
              "this_year": {
                "note": "Sales made this year do not free any limit until next year, and do not restore this year's annual limit.",
                "year": 2026,
                "annual_used": {
                  "growth": 1000000,
                  "tsumitate": 600000
                },
                "can_still_buy": {
                  "growth": 1400000,
                  "tsumitate": 600000,
                  "combined_max": 2000000
                },
                "growth_used_book": 6000000,
                "lifetime_remaining": 9000000,
                "lifetime_used_book": 9000000,
                "growth_lifetime_remaining": 6000000
              },
              "summary_en": "In 2026 you can still buy up to 2,000,000 yen (tsumitate up to 600,000, growth up to 1,400,000). On January 1, 2027, 1,000,000 yen of sold book value is recovered, leaving 10,000,000 yen of lifetim...",
              "summary_ja": "2026年はあと最大2,000,000円(つみたて600,000円・成長1,400,000円まで)購入でき、2027年1月には売却分の簿価1,000,000円が戻って生涯枠の残りは10,000,000円、その年は最大3,600,000円まで購入できます(新NISAの制度、2026年10月時点で確認)。",
              "sale_price_check": {
                "sale_price": 1500000,
                "explanation_en": "The limit freed next year is the book value sold (1,000,000 yen), not the sale price (1,500,000 yen).",
                "explanation_ja": "売却額1,500,000円ではなく、売った分の取得価額(簿価)1,000,000円が翌年に戻ります。",
                "recovered_book": 1000000
              }
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "as_of": {
                    "type": "string",
                    "description": "Date YYYY-MM-DD (default today); its year is 'this year'"
                  },
                  "birth": {
                    "type": "string",
                    "description": "Optional birth date YYYY-MM-DD to check the age-18 requirement (as of January 1)"
                  },
                  "sale_price": {
                    "type": "string",
                    "description": "Optional: total sale price, to show that the limit freed is the book value, not the price"
                  },
                  "held_growth": {
                    "type": "string",
                    "description": "Book value (cost) of current 成長投資枠 holdings, yen"
                  },
                  "sold_growth": {
                    "type": "string",
                    "description": "Book value (cost) of 成長投資枠 holdings sold this year, yen"
                  },
                  "bought_growth": {
                    "type": "string",
                    "description": "成長投資枠 purchases this calendar year, yen (default 0)"
                  },
                  "held_tsumitate": {
                    "type": "string",
                    "description": "Book value (cost) of current つみたて投資枠 holdings, yen. Give this and/or held_growth"
                  },
                  "sold_tsumitate": {
                    "type": "string",
                    "description": "Book value (cost) of つみたて投資枠 holdings sold this year, yen"
                  },
                  "bought_tsumitate": {
                    "type": "string",
                    "description": "つみたて投資枠 purchases this calendar year, yen (default 0)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 15 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/nenkin",
    "mimeType": "application/json",
    "description": "Japanese public pension estimate (老齢基礎年金) using official parameters for the current fiscal year (FY2026 full amount 847,300 yen): exemptions, early claim/deferral rates, fuka-nenkin. Returns the rule year used and a quotable sentence; asks for the contribution record instead of guessing; warns when parameters are stale."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "paid": "456",
            "birth": "1975-06-15",
            "start_age": "67"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "nenkin": {
              "note": null,
              "basis": {
                "as_of_date": "2026-10-19",
                "parameters": "令和8年度年金額改定(厚生労働省, 2026年4月分から。国民年金+1.9%)",
                "fiscal_year": 2026
              },
              "eligible": true,
              "adjustment": {
                "kind": "deferral (kurisage) 24 months x +0.7%",
                "rate": 0.168,
                "start_age": 67,
                "start_extra_months": 0
              },
              "summary_en": "Under FY2026 parameters, a person born 1975-06-15 with 456 paid months starting at 67 would receive about 940,164 yen per year (about 78,347 yen per month) o...",
              "summary_ja": "令和8年度の基準で、1975年6月15日生まれ・保険料納付456か月の人が67歳から受け取る老齢基礎年金の年額は940,164円(月額約78,347円)の見込みです。",
              "birth_class": "born 1956-04-02 or later",
              "fiscal_year": 2026,
              "fuka_annual": 0,
              "kiso_annual": 940164,
              "kosei_annual": null,
              "total_annual": 940164,
              "weighted_months": 456,
              "qualifying_months": 456,
              "full_amount_annual": 847300,
              "total_monthly_approx": 78347
            },
            "stale_warning": null,
            "parameter_source": "令和8年度年金額改定(厚生労働省, 2026年4月分から。国民年金+1.9%)"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "birth"
                ],
                "properties": {
                  "fuka": {
                    "type": "string",
                    "description": "Fuka-nenkin paid months (200 yen/month)"
                  },
                  "paid": {
                    "type": "string",
                    "description": "Paid contribution months (0-480)"
                  },
                  "birth": {
                    "type": "string",
                    "description": "Birth date YYYY-MM-DD (1941-04-02 or later)"
                  },
                  "karaki": {
                    "type": "string",
                    "description": "Karaki (合算対象期間) months (eligibility only)"
                  },
                  "student": {
                    "type": "string",
                    "description": "Student deferral months (counts toward eligibility only)"
                  },
                  "exempt_1q": {
                    "type": "string",
                    "description": "1/4 exemption months from 2009-04"
                  },
                  "exempt_3q": {
                    "type": "string",
                    "description": "3/4 exemption months from 2009-04"
                  },
                  "kosei_yen": {
                    "type": "string",
                    "description": "Optional annual kosei-nenkin amount (e.g. from nenkin teikibin); only the early/deferral rate is applied"
                  },
                  "start_age": {
                    "type": "string",
                    "description": "Claim start age 60-75 (default 65)"
                  },
                  "exempt_full": {
                    "type": "string",
                    "description": "Full exemption months from 2009-04"
                  },
                  "exempt_half": {
                    "type": "string",
                    "description": "Half exemption months from 2009-04"
                  },
                  "fiscal_year": {
                    "type": "string",
                    "description": "Parameter year (default latest)"
                  },
                  "exempt_1q_pre2009": {
                    "type": "string",
                    "description": "1/4 exemption months before 2009-04"
                  },
                  "exempt_3q_pre2009": {
                    "type": "string",
                    "description": "3/4 exemption months before 2009-04"
                  },
                  "start_extra_months": {
                    "type": "string",
                    "description": "Additional months 0-11"
                  },
                  "exempt_full_pre2009": {
                    "type": "string",
                    "description": "Full exemption months before 2009-04"
                  },
                  "exempt_half_pre2009": {
                    "type": "string",
                    "description": "Half exemption months before 2009-04"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 16 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/housing-loan",
    "mimeType": "application/json",
    "description": "Japan mortgage tax deduction (住宅ローン控除) for move-ins 2026-2030 under the FY2026 reform: borrowing limit and 13/10-year period by new/resale/used, performance class, special household and floor area, dated transitional rules, yearly deduction or a full-period projection from a loan with the income-tax/resident-tax split. Refuses older move-ins instead of mixing rules; asks for missing facts. Rules checked against the National Tax Agency tax answers (law as of 2026-04-01) and cross-checked by an independent implementation."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "rate": "0.8",
            "type": "new",
            "move_in": "2026-04",
            "kosodate": "yes",
            "floor_area": "70",
            "term_years": "35",
            "loan_amount": "40000000",
            "performance": "zeh"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "housing_loan": {
              "home": {
                "type": "new",
                "move_in": "2026-04",
                "type_ja": "新築",
                "performance": "zeh",
                "floor_area_m2": 70,
                "performance_ja": "ZEH水準省エネ住宅"
              },
              "basis": {
                "rules": "令和8年度税制改正後の住宅ローン控除(2026〜2030年入居、令和8年4月1日現在の法令。2026年10月時点で確認)",
                "as_of_date": "2026-10-19",
                "move_in_year": 2026
              },
              "eligible": true,
              "projection": {
                "schedule": [
                  {
                    "year": 2026,
                    "deduction": 275300,
                    "year_end_balance": 39337995
                  },
                  {
                    "year": 2027,
                    "deduction": 268300,
                    "year_end_balance": 38338347
                  }
                ],
                "monthly_payment": 109224,
                "total_deduction": 3017000
              },
              "summary_en": "For a newly built ZEH-level energy-efficient home (70 m2) moving in 2026-04 (special household), the borrowing limit is 45,000,000 yen and the deduction lasts 13 years (2026-2038): each year 0.7% o...",
              "summary_ja": "2026年4月入居の新築のZEH水準省エネ住宅(70㎡)(子育て・若者夫婦世帯)は、借入限度額4,500万円・控除期間13年(2026〜2038年分)で、各年の控除額は年末残高×0.7%、最大で年315,000円です。借入4,000万円・金利0.8%・35年の元利均等返済なら、13年間の控除額の合計は約3,017,000円の見込みです(税額が控除額より少ない年は全額は戻りません)。(令和8年度税制改正後の住宅ローン控除、2026年10月時点で確認)",
              "deduction_rate": 0.007,
              "borrowing_limit": 45000000,
              "deduction_years": 13,
              "deduction_period": {
                "last_year": 2038,
                "first_year": 2026
              },
              "special_household": true,
              "max_deduction_per_year": 315000
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "move_in",
                  "type",
                  "performance",
                  "floor_area"
                ],
                "properties": {
                  "rate": {
                    "type": "string",
                    "description": "Annual interest rate in percent (fixed), e.g. 0.8"
                  },
                  "type": {
                    "type": "string",
                    "description": "new (新築) | resale (買取再販) | used (中古/既存)"
                  },
                  "as_of": {
                    "type": "string",
                    "description": "Date for the rule basis, YYYY-MM-DD (default today)"
                  },
                  "price": {
                    "type": "string",
                    "description": "Home price (取得対価), yen: caps the counted balance"
                  },
                  "income": {
                    "type": "string",
                    "description": "Total income (合計所得金額), yen. Required for 40-50 m2 homes"
                  },
                  "move_in": {
                    "type": "string",
                    "description": "Move-in month YYYY-MM (or YYYY-MM-DD), 2026-01 to 2030-12"
                  },
                  "rebuild": {
                    "type": "string",
                    "description": "Rebuilding on the same site? yes | no (red-zone exception)"
                  },
                  "seismic": {
                    "type": "string",
                    "description": "Used home built before 1982: has a seismic-standard certificate? yes | no"
                  },
                  "kosodate": {
                    "type": "string",
                    "description": "Special household (子育て・若者夫婦世帯) on Dec 31 of the move-in year: yes | no. Required when it changes the limit"
                  },
                  "red_zone": {
                    "type": "string",
                    "description": "In a disaster red zone? yes | no (new homes moving in 2028+)"
                  },
                  "built_date": {
                    "type": "string",
                    "description": "Registered construction date YYYY-MM-DD (new homes' transitional rules; used homes before 1982)"
                  },
                  "floor_area": {
                    "type": "string",
                    "description": "Registered floor area in m2 (condos: private area). 40 or more"
                  },
                  "income_tax": {
                    "type": "string",
                    "description": "Annual income tax before the deduction, yen: splits the deduction between income tax and resident tax"
                  },
                  "term_years": {
                    "type": "string",
                    "description": "Loan term in years (10-50)"
                  },
                  "loan_amount": {
                    "type": "string",
                    "description": "Loan amount, yen: with rate and term_years, projects every year of the period"
                  },
                  "performance": {
                    "type": "string",
                    "description": "certified (認定長期優良・低炭素) | zeh (ZEH水準) | energy (省エネ基準適合) | other"
                  },
                  "permit_date": {
                    "type": "string",
                    "description": "Building confirmation date YYYY-MM-DD (needed for some new homes)"
                  },
                  "taxable_income": {
                    "type": "string",
                    "description": "Taxable income (課税総所得金額等), yen: resident-tax cap 5% (max 97,500 yen)"
                  },
                  "year_end_balance": {
                    "type": "string",
                    "description": "Year-end loan balance, yen: returns that year's deduction"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 17 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/convert-unit",
    "mimeType": "application/json",
    "description": "Unit conversion: length, weight, speed, data, area, volume, energy, temperature."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "to": "mile",
            "from": "kilometer",
            "value": "100"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "to": "mile",
            "from": "kilometer",
            "value": 100,
            "result": 62.13711922,
            "category": "length"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "value",
                  "from",
                  "to"
                ],
                "properties": {
                  "to": {
                    "type": "string",
                    "description": "Target unit (e.g. mile, fahrenheit)"
                  },
                  "from": {
                    "type": "string",
                    "description": "Source unit (e.g. kilometer, celsius)"
                  },
                  "value": {
                    "type": "string",
                    "description": "Value to convert"
                  },
                  "category": {
                    "type": "string",
                    "description": "Optional unit category (length, weight, speed, data, area, volume, energy); auto-detected if omitted"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 18 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/nenkin-deferral",
    "mimeType": "application/json",
    "description": "When to start the Japanese public pension: break-even age of early claim or deferral versus a baseline, probability of living to that age from the official Japanese life table (令和7年簡易生命表, by sex), and expected lifetime total for each start age 60-75. Returns the rule year used, assumptions, what would change the answer, and a quotable sentence. Totals cross-checked by an independent implementation."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "sex": "male",
            "birth": "1975-06-15",
            "start_age": "70"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "stale_warning": null,
            "nenkin_deferral": {
              "basis": {
                "as_of_date": "2026-10-19",
                "life_table": "令和7(2025)年簡易生命表(厚生労働省)",
                "life_table_url": "https://www.mhlw.go.jp/toukei/saikin/hw/life/life25/index.html",
                "life_table_year": 2025,
                "pension_parameters": "令和8年度年金額改定(厚生労働省, 2026年4月分から。国民年金+1.9%) — full basic pension used because 'annual_65' was not given"
              },
              "person": {
                "sex": "male",
                "birth": "1975-06-15",
                "age_at_as_of": 51.35,
                "max_deferral_months": 120,
                "early_rate_per_month": 0.004
              },
              "options": [
                {
                  "start_age": 70,
                  "annual_amount": 1203166,
                  "adjustment_rate": 0.42,
                  "expected_total_yen": 16588461,
                  "start_age_label_ja": "70歳",
                  "start_extra_months": 0,
                  "break_even_vs_baseline": {
                    "meaning": "Starting at this age pays more in total than the baseline only if alive beyond the break-even age.",
                    "age_years": 81.9,
                    "age_label_en": "81 years 11 months",
                    "age_label_ja": "81歳11か月",
                    "prob_alive_at_break_even_pct": 59.7
                  },
                  "prob_alive_at_start_pct": 87.4,
                  "prob_this_option_pays_more_pct": 59.7
                }
              ],
              "baseline": {
                "start_age": 65,
                "annual_amount": 847300,
                "adjustment_rate": 0,
                "expected_total_yen": 15510001,
                "start_age_label_ja": "65歳",
                "start_extra_months": 0,
                "prob_alive_at_start_pct": 93
              },
              "summary_en": "For a male born 1975-06-15, starting at 70 years instead of 65 years breaks even at 81 years 11 months; the probability of living to that age is about 59.7% ...",
              "summary_ja": "1975年6月15日生まれの男性が70歳から受け取る場合、65歳開始との損益分岐は81歳11か月で、令和7(2025)年簡易生命表ではその年齢まで生きる確率は約59.7%です(額面・税と社会保険料は考慮せず)。",
              "baseline_note": null,
              "annual_amount_at_65": 847300,
              "best_by_expected_total": {
                "label_ja": "70歳",
                "start_age": 70,
                "start_extra_months": 0
              }
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "birth",
                  "sex"
                ],
                "properties": {
                  "sex": {
                    "type": "string",
                    "description": "male or female (life tables are by sex)"
                  },
                  "as_of": {
                    "type": "string",
                    "description": "Date the person is known to be alive, YYYY-MM-DD (default today)"
                  },
                  "birth": {
                    "type": "string",
                    "description": "Birth date YYYY-MM-DD (1941-04-02 or later)"
                  },
                  "annual_65": {
                    "type": "string",
                    "description": "Annual pension at 65 in yen (e.g. from nenkin teikibin). Default: full basic pension. Affects expected totals only"
                  },
                  "start_age": {
                    "type": "string",
                    "description": "Start age to evaluate (60-75). Omit to get all start ages"
                  },
                  "fiscal_year": {
                    "type": "string",
                    "description": "Pension parameter year (default latest)"
                  },
                  "baseline_age": {
                    "type": "string",
                    "description": "Age to compare against (default 65; moved to the next whole age if 65 is already past)"
                  },
                  "life_table_year": {
                    "type": "string",
                    "description": "Life table year (default latest)"
                  },
                  "start_extra_months": {
                    "type": "string",
                    "description": "Additional months 0-11"
                  },
                  "baseline_extra_months": {
                    "type": "string",
                    "description": "Additional months 0-11 for the baseline"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 19 of 19

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x716fdE0dAc4Ef6ed2018206d43697C6Bb71D7EB3",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://logigrain.net/api/date",
    "mimeType": "application/json",
    "description": "Date difference, add days, Unix timestamp conversion, weekday count."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "end": "2026-12-31",
            "start": "2026-01-01",
            "action": "diff"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "end": "2026-12-31",
            "days": 364,
            "start": "2026-01-01",
            "action": "diff",
            "direction": "forward"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "end": {
                    "type": "string",
                    "description": "End date YYYY-MM-DD (diff/business)"
                  },
                  "days": {
                    "type": "string",
                    "description": "Days to add (action=add)"
                  },
                  "start": {
                    "type": "string",
                    "description": "Start date YYYY-MM-DD (diff/add/business)"
                  },
                  "action": {
                    "type": "string",
                    "description": "Operation (default diff)"
                  },
                  "timestamp": {
                    "type": "string",
                    "description": "Unix timestamp in seconds (action=unix)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Can I trust it score from our own monitoring

score from our own monitoring

89/100 Solid

#20 of 148 in Finance. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.

Reliability
100% uptime 30d
Compliance
A 14/14 checks pass
Price
$0.001 p9 in Finance
Risk
clean no risk flag
Traction
$0.00 30d 0 buyers
Last change
price changed 5d ago 3 in 30d
14/14 compliance checks
  • 402 payload captured
  • accepts[] array present
  • payTo address recoverable
  • payTo at accepts[0].payTo (conformant shape)
  • payTo is a valid on-chain address
  • atomic price declared
  • atomic price in a sane range
  • asset (token) address declared
  • network resolves to CAIP-2
  • payment scheme declared
  • served over HTTPS
  • declares the current x402 version (2)
  • EIP-712 domain parameters present on every EVM entry
  • x402 v2 envelope delivered in the payment-required header

402 terms unchanged since 2026-11-09. Last up 2026-11-14.

── Site signals

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
How the score works

What the score read on this service: status online, 100% uptime 30d, 151ms response p95, x402 compliance 14 of 14, $0.001 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

It is a score inside Finance, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 148 listings, this one among them: the same 148 the position above is counted against. When the two differ, the field is the wider one, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Traction is a conservative undercount; first settlement seen 2026-06-27.

All measured facts

What it does

Exact calculation tools for AI agents, paid per call with x402 (0.001 USDC on Base). Japanese rules that change every year and that LLMs often get wrong: public pension amount and start-age break-even with survival probability from the official life table, new NISA remaining limits, and the mortgage tax deduction (2026-2030 move-ins). Each answer states which year's rules it used, asks for missing facts instead of guessing, and includes a quotable sentence. Also: astronomy and calendar (moon phase, Japanese era, Western natal chart, Four Pillars, Nine Star Ki, Zi Wei Dou Shu) and general utilities (compound interest, currency and unit conversion, date math, exact combinatorics).

LogiGrain is a listed x402 Finance API. Captured payment terms name Base. Monitoring and settlement figures below describe the observations available to this directory; an unpaid HTTP 402 check does not prove that a paid call will deliver.

Assessment computed at . Latest service check observed at . Service data JSON · Measurement methodology.

Page rendered at . This response time is separate from the observation and computation times attached to each measurement.

Latest endpoint observation: . Latest price capture: . Prices are recorded quotes, not a promise of availability. Token assets and payment terms are listed separately. Endpoint data JSON · Price history JSON · Measurement methodology.

Assessment computed at . Uptime uses the stated daily-rollup window; response times are in milliseconds, compliance is passed/evaluated checks, and traction is a measured settlement floor. The comparison score is out of 100 within this category. Assessment JSON · Measurement methodology.

Observed daily coverage: 2026-10-16 to 2026-11-14 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. Latest settlement in the assessment: . Uptime and response JSON · Volume JSON · Buyers JSON · Measurement methodology.

Ranked from the measured category pool, refreshed at most once a minute. The comparison has no persisted computation timestamp; the assessment time above belongs to this service only. Ranking API documentation · Ranking methodology.

x402 List home · Services · Finance

uptime · latest daily rollup
100%
uptime 7d
100%
uptime 30d
100%
uptime 90d
100%
response p95
151ms
avg response
209ms
total checks
4,358

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

price (min)
$0.001
category percentile (min)
p9 in Finance
endpoints / prices
19 / 1
model
flat
stability
0%

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age
197d
registrar
Cloudflare, Inc.
hosting
custom
domain created
2026-04-28

Identity facts, not a risk score.

assessment volume 30d
$0.00
exact assessment volume 30d (USD)
0
assessment recorded at (UTC)
2026-11-14T02:53:28.037Z
buyers 30d
0
settlements 30d
0
measured since
2026-06-27 (start of our harvest window)
last settlement
2026-09-24
top buyer share
-
top 3 buyers share
-
concentrated volume
no
trend 7d vs 30d
-
networks
eip155:8453
volume all-time
$0.51
settlements all-time
509
median settlement 30d
-
max settlement 30d
-

Assessment volume uses the latest 30d assessment. Over time sums daily address snapshots, rounded to cents and refreshed separately. The two sources can differ in timing, precision and shared-address attribution. Amounts use cents for comparison; known sub-cent values keep up to 12 significant digits. The exact stored assessment value is shown above.

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share lowers the on-chain traction part of the ranking score behind this page's verdict and /best, by up to half when one address holds all 30d volume. The Recommended and Highest volume sorts of the services list do not use it; they use the Concentrated volume rule instead.

member since
2026-07-01
Recent checks
Latest 18 unpaid HTTP checks, newest first; response times in milliseconds, observation times in UTC
Checked at (UTC)StatusHTTPResponseEndpoints
Online40294ms19
Online402107ms19
Online40289ms19
Online40249ms19
Online40294ms19
Online40285ms19
Online40280ms19
Online40274ms19
Online402104ms19
Online40260ms19
Online40291ms19
Online402113ms19
Online402104ms19
Online40270ms19
Online402126ms19
Online402120ms19
Online402100ms19
Online40273ms19

Changes3 in 30d

Latest 3 recorded changes, up to 10 in the last 30 days; newest first; observation times in UTC
Observed at (UTC)ChangeEvidence
price changed

GET /api/moon · eip155:8453 · USDC: 500 → 1000

price changed

GET /api/moon · eip155:8453 · USDC: 1000 → 500

schema changed

endpoint added GET /api/code

endpoint added GET /api/compound

endpoint added GET /api/convert

endpoint added GET /api/convert-unit

endpoint added GET /api/date

endpoint added GET /api/era

endpoint added GET /api/feed

endpoint added GET /api/housing-loan

endpoint added GET /api/json

endpoint added GET /api/math

endpoint added GET /api/moon

endpoint added GET /api/nenkin

endpoint added GET /api/nenkin-deferral

endpoint added GET /api/nisa

endpoint added GET /api/probability

schema added GET /api/code exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/compound exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/convert exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/convert-unit exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/date exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/era exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/feed exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/housing-loan exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/json exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/math exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/moon exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/nenkin exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/nenkin-deferral exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/nisa exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

schema added GET /api/probability exact eip155:8453 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 USDC 2 300 {"name":"USD Coin","version":"2"}

Amounts are on-wire atomic units in the named asset.

all changes

Over time

On-chain volume daily snapshots, USD 30d: $0.00, peak $0.01 on 11-09
volume no data in the payload
Distinct buyers per dayDistinct buyers per day
Uptime 100% on all 29 completed days
Volume 30d
$0.00
Uptime
100% on all 29 completed days
Daily on-chain settlement volume in US dollars, 2026-10-16 to 2026-11-14; highest day $0.01 on 11-09; 27 days have no data in the payload; distinct buyers per day
More charts
Response time daily average, ms min 86ms, avg 182ms, max 274ms

10-16 to 11-14* UTC

Scores over time

x402 compliance low 14/14, high 14/14

10-16 to 11-14* UTC

Price percentile in Finance own low to high; exact values below

10-16 to 11-14* UTC

Site signals present (of 6) own low to high; exact values below

10-16 to 11-14* UTC

Scores: one day per column, 10-16 to 11-14*, on the columns of Response time. Uptime held 100% every day in this window, including any partial day. Daily readings remain in the Uptime strip and Values. The checklist grew from 11 to 14 checks on 2026-07-28, before this window. Pillar lines use their own low and high. Exact dated readings are available in each readout and in Values.

Each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/logigrain/price, /scores, /volume and /buyers.

Values

* today so far, partial (UTC).

The uptime summary counts completed UTC days only. The strip, readouts and table retain today's partial reading.

Daily snapshot total, 30d: $0.02, peak $0.01 on 11-09. The visible 30d total in Traction comes from the latest assessment. These sources can differ in their window, refresh time, cent rounding and shared-address attribution.

Daily address snapshots: 2026-10-16 to 2026-11-14 UTC; * today so far, partial (UTC). Daily snapshots store cents. A recorded $0.00 with settlements cannot distinguish exact zero from volume rounded away. Lost precision is unavailable here. † marks a recorded $0.00 with settlements.

Settlement volume uses the stored USD valuation of tracked payments; it is distinct from token quantities. USD-pegged assets are valued at 1 USD per token in these rollups. The measured settlement floor does not cover all payments to this service.

Assessment history last recorded at . Each UTC day uses its last recorded run; missing readings stay unmeasured. Assessment history JSON · Measurement methodology.

Daily values, 2026-10-16 to 2026-11-14: address settlement volume in USD, distinct buyer and settlement counts, uptime percent, average response milliseconds, compliance passed/total, price percentile 0-100, site signals out of 6; UTC dates
DayVolumeBuyersSettlementsUptimeResponseCompliancePrice percentileSite signals
2026-10-16no datano datano data100%225.70ms14/14p134/6
2026-10-17no datano datano data100%192.33ms14/14p134/6
2026-10-18no datano datano data100%165.75ms14/14p134/6
2026-10-19no datano datano data100%211.21ms14/14p124/6
2026-10-20no datano datano data100%237.87ms14/14p124/6
2026-10-21no datano datano data100%179.10ms14/14p124/6
2026-10-22no datano datano data100%265.13ms14/14p124/6
2026-10-23no datano datano data100%178.71ms14/14p124/6
2026-10-24no datano datano data100%127.74ms14/14p124/6
2026-10-25no datano datano data100%209.88ms14/14p124/6
2026-10-26no datano datano data100%271.91ms14/14p124/6
2026-10-27no datano datano data100%250.44ms14/14p114/6
2026-10-28no datano datano data100%187.57ms14/14p114/6
2026-10-29no datano datano data100%204.60ms14/14p114/6
2026-10-30no datano datano data100%213.40ms14/14p114/6
2026-10-31no datano datano data100%274.26ms14/14p104/6
2026-11-01no datano datano data100%212.28ms14/14p104/6
2026-11-02no datano datano data100%174.64ms14/14p104/6
2026-11-03no datano datano data100%218.47ms14/14p104/6
2026-11-04no datano datano data100%226.03ms14/14p94/6
2026-11-05no datano datano data100%166.90ms14/14p94/6
2026-11-06no datano datano data100%158.93ms14/14p94/6
2026-11-07no datano datano data100%161.31ms14/14p94/6
2026-11-08no datano datano data100%86.46ms14/14p94/6
2026-11-09$0.0136100%130.24ms14/14p94/6
2026-11-10$0.0146100%111.68ms14/14p94/6
2026-11-11$0.00 recorded†11100%113.82ms14/14p94/6
2026-11-12no datano datano data100%100.89ms14/14p94/6
2026-11-13no datano datano data100%109.46ms14/14p94/6
2026-11-14*no datano datano data100%91.25ms14/14p94/6

Alternatives in Finance

402lounge strong 97/100 100% up 30d --- 30d
Mangrove AI strong 97/100 99.9% up 30d --- 30d
LiquidVision.app strong 97/100 99.5% up 30d --- 30d
Trading Signals Toolkit strong 97/100 100% up 30d --- 30d
SpendTheBits strong 96/100 100% up 30d --- 30d

5 of 147 other ranked services in Finance, ordered by the same measured score.

see the whole category

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HTML

<a href="https://x402-list.com/services/logigrain?utm_source=badge&utm_medium=referral&utm_campaign=embed">
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</a>

Markdown

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HTML, live uptime variant

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Delisting

To request delisting, email info@x402-list.com with the service name, slug, or URL. Removal is free and does not require proof of ownership. See all free email requests.