KHOTEM · Cryptographic Witness

✓ verifiedonline

Call it x402 v2

x402 v2

Base URL: https://khotem.com
Payment: x402 v2, header channel

$ curl -i 'https://khotem.com/api/doc/15'

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

Endpoints 8 paid routes on khotem.com

POST/api/attestBase+Pol+Sol$0.10since 08-31

POST/api/auditBase+Pol+Sol$0.15since 08-31

GET/api/doc/15Base+Pol+Sol$0.10since 08-26

GET/api/doc/16Base+Pol+Sol$0.10since 08-26

GET/api/doc/17Base+Pol+Sol$0.10since 08-26

POST/api/sealBase+Pol+Sol$0.10since 08-31

POST/api/threadBase+Pol+Sol$0.25since 08-31

POST/api/verifyBase+Pol+Sol$0.05since 08-31

Prices as captured in the 402 response: median $0.10 across the 8 endpoints.

Example 402 response

Endpoints and prices

Current paid endpoints; minimum quoted prices in USD where available; first capture dates in UTC
Method	Path	Description	Price	Network	Asset	402 channel	Captured
POST	/api/attest	No description	$0.10	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-31
POST	/api/audit	No description	$0.15	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-31
GET	/api/doc/15	No description	$0.10	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-26
GET	/api/doc/16	No description	$0.10	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-26
GET	/api/doc/17	No description	$0.10	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-26
POST	/api/seal	No description	$0.10	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-31
POST	/api/thread	No description	$0.25	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-31
POST	/api/verify	No description	$0.05	Base+Pol+Sol	USDC, Dai Stablecoin, (PoS) Dai Stablecoin	header	since 08-31

Payment evidence

402 payload captured at 2026-10-10 12:44:12 UTC. Check evidence JSON · Measurement methodology.

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "150000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "150000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "150000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "150000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "150000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/audit",
    "mimeType": "application/json",
    "description": "AUDIT: batch audit of an array of sessions. POST body: array. Returns per-item results + overall verdict."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {},
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "ok": 3,
            "total": 5,
            "results": [
              {
                "ok": true,
                "root": "9f2c…"
              },
              {
                "ok": false,
                "reason": "root_mismatch"
              }
            ],
            "verdict": "✗ TAMPERED",
            "payment_seal": "a1b2c3d4e5f60708",
            "verdict_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "array",
                "items": {
                  "type": "object",
                  "required": [
                    "seal"
                  ],
                  "properties": {
                    "seal": {
                      "type": "object",
                      "required": [
                        "root"
                      ],
                      "properties": {
                        "root": {
                          "type": "string",
                          "description": "merkle root hex"
                        }
                      }
                    }
                  },
                  "description": "Session object. All fields except \"seal\" and \"_\"-prefixed are hashed into leaves; seal.root must equal the merkle root."
                },
                "description": "Array of session objects, same shape as /api/verify"
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Other captured 402 responses (7)

Captured payload 2 of 8

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "50000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "50000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "50000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "50000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "50000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/verify",
    "mimeType": "application/json",
    "description": "VERIFY: session integrity check (merkle+CID). POST body: session object(s) with seal.root. Returns verdict ALL VERIFIED / TAMPERED with reason."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "seal": {
              "root": "merkle root hex"
            }
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "ok": 1,
            "total": 1,
            "results": [
              {
                "ok": true,
                "root": "9f2c…"
              }
            ],
            "verdict": "✓ ALL VERIFIED",
            "payment_seal": "a1b2c3d4e5f60708",
            "verdict_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "seal"
                ],
                "properties": {
                  "seal": {
                    "type": "object",
                    "required": [
                      "root"
                    ],
                    "properties": {
                      "root": {
                        "type": "string",
                        "description": "merkle root hex"
                      }
                    }
                  }
                },
                "description": "Session object. All fields except \"seal\" and \"_\"-prefixed are hashed into leaves; seal.root must equal the merkle root."
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Captured payload 3 of 8

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "250000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "250000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "250000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "250000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "250000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/thread",
    "mimeType": "application/json",
    "description": "THREAD: full sealed document thread (Russian). GET after payment — all documents with per-file sha16."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "mode": "DIRECT",
            "thread": {
              "15": {
                "file": "DOC15.md",
                "sha16": "a1b2c3d4e5f60708",
                "content": "<markdown>"
              }
            },
            "payment_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "queryParams"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "DELETE",
                  "HEAD"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {},
                "description": "No input — GET returns the full document thread after payment.",
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Captured payload 4 of 8

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "100000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/doc/15",
    "mimeType": "application/json",
    "description": "DOC 15: sealed operating-law document (Russian). GET after payment — markdown + sha16."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "doc": "15",
            "sha16": "a1b2c3d4e5f60708",
            "content": "<document 15, markdown>",
            "payment_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "queryParams"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "DELETE",
                  "HEAD"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {},
                "description": "No input — GET returns the document after payment.",
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Captured payload 5 of 8

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "100000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/seal",
    "mimeType": "application/json",
    "description": "SEAL: witnessed cryptographic stamp + timestamp. POST body: {\"content\":\"...\"} (hashed and forgotten) or {\"hash\":\"<sha256 hex>\"} — content never leaves your machine. Returns seal_stamp + payment_seal."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "hash": "Pre-computed sha256 hex (64 chars)",
            "content": "Content to hash and seal"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "note": "content not stored: hashed and forgotten",
            "proof": "recorded in the KHOTEM ledger; verifiable via /api/attest",
            "sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
            "witness": "KHOTEM-SEAL",
            "timestamp": "2026-08-24T12:00:00.000Z",
            "seal_stamp": "a1b2c3d4e5f60708",
            "payment_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "properties": {
                  "hash": {
                    "type": "string",
                    "description": "Pre-computed sha256 hex (64 chars)"
                  },
                  "content": {
                    "type": "string",
                    "description": "Content to hash and seal"
                  }
                },
                "description": "Provide either content (server hashes and forgets it) or hash (client-side sha256, content never sent)."
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Captured payload 6 of 8

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "100000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/attest",
    "mimeType": "application/json",
    "description": "ATTEST: certificate of existence. POST body: {\"ref\":\"0x<txHash>\" | \"<sha256 hex>\" | \"<16-hex stamp>\"} — exact match against the ledger. Returns CONFIRMED + entry, or honest NOT_FOUND."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "ref": "txHash (0x+64 hex) / sha256 (64 hex) / stamp (16 hex) — exac"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "entry": {
              "ts": "2026-08-24T12:00:00.000Z",
              "event": "seal",
              "sha256": "e3b0c4…"
            },
            "attest": "CONFIRMED",
            "attest_seal": "a1b2c3d4e5f60708",
            "payment_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "ref"
                ],
                "properties": {
                  "ref": {
                    "type": "string",
                    "description": "txHash (0x+64 hex) / sha256 (64 hex) / stamp (16 hex) — exact match"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Captured payload 7 of 8

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "100000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/doc/16",
    "mimeType": "application/json",
    "description": "DOC 16: sealed operating-law document (Russian). GET after payment — markdown + sha16."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "doc": "16",
            "sha16": "a1b2c3d4e5f60708",
            "content": "<document 16, markdown>",
            "payment_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "queryParams"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "DELETE",
                  "HEAD"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {},
                "description": "No input — GET returns the document after payment.",
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Captured payload 8 of 8

{
  "accepts": [
    {
      "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
      "extra": {
        "name": "Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
      "extra": {
        "name": "(PoS) Dai Stablecoin",
        "version": "2"
      },
      "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
      "amount": "100000000000000000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
      "amount": "100000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://khotem.com/api/doc/17",
    "mimeType": "application/json",
    "description": "DOC 17: sealed operating-law document (Russian). GET after payment — markdown + sha16."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "doc": "17",
            "sha16": "a1b2c3d4e5f60708",
            "content": "<document 17, markdown>",
            "payment_seal": "1020304050607080"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "queryParams"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "DELETE",
                  "HEAD"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {},
                "description": "No input — GET returns the document after payment.",
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "khotemSeal": {
      "info": {
        "verify": "POST /api/attest {\"ref\": \"<payment_seal or sha256>\"}",
        "description": "Every paid answer carries a KHOTEM seal (payment_seal): a ledger-anchored, independently verifiable stamp of this exact call. Verify any stamp via POST /api/attest ($0.10) or free precheck POST /api/attest/check.",
        "free_precheck": "POST /api/attest/check {\"ref\": \"…\"}"
      }
    },
    "builderCode": {
      "code": "bc_l38pwyuh",
      "schema": "erc-8021-schema-2",
      "registry": "base-builder-codes"
    }
  },
  "x402Version": 2
}

Can I trust it score from our own monitoring

score from our own monitoring

85/100 Solid

                           │         │     ···│···
0                          55        75       93

                │     │   ·│··
0               55    75   93

#36 of 117 in Verification. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.

Reliability: 100% uptime 30d
Compliance: A 14/14 checks pass
Price: $0.02 to $0.25 p66 in Verification
Risk: clean no risk flag
Traction: $2.07 30d 4 buyers, top buyer 71% (address, not entity)
Last change: price changed 2h ago 1 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 2026-10-10. Last up 2026-10-10.

── 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, 243ms response p95, x402 compliance 14 of 14, $0.02 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 Verification, 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 117 listings, this one among them: the same 117 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.

Delivery-verified 2026-09-01 (paid probe delivered HTTP 200), no expiry, revoked only on payTo or schema drift. Settled via payAI ($1.74, 69 tx) and coinbase ($0.33, 15 tx). Traction is a conservative undercount; first settlement seen 2026-08-30.

All measured facts

What it does

KHOTEM is a cryptographic witness for AI agents: seal (SHA-256 commitments), attest, verify, timestamp and audit, plus three paid operational-law documents for agent builders. x402 v2 with EIP-712-ready accepts on Base, Polygon and Solana. Direct on-chain USDC verification · no facilitator, no accounts, no API keys. Pay per request, present the settlement txHash in X-PAYMENT. Machine-readable via OpenAPI, Bazaar discovery extension, skill.md, AGENTS.md and llms.txt.

KHOTEM · Cryptographic Witness is a listed x402 Verification API. Captured payment terms name Base, Polygon, Solana. 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 2026-10-10 10:13:01 UTC. Latest service check observed at 2026-10-10 14:52:10 UTC. Service data JSON · Measurement methodology.

Page rendered at 2026-10-10 15:02:30 UTC. This response time is separate from the observation and computation times attached to each measurement.

Latest endpoint observation: 2026-10-10 14:52:10 UTC. Latest price capture: 2026-10-10 12:28:11 UTC. 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 2026-10-10 10:13:01 UTC. 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: 2026-09-11 to 2026-10-10 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: 2026-10-10 05:10:13 UTC. 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 · Verification

uptime · latest daily rollup: 100%
uptime 7d: 100%
uptime 30d: 100%
uptime 90d: 100%
response p95: 243ms
avg response: 286ms
total checks: 2,725

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

price (min): $0.02
price (max): $0.25
category percentile (min): p66 in Verification
category percentile (max): p69 in Verification
endpoints / prices: 8 / 5
model: tiered
stability: 100%

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: 48d
registrar: Registrar of Domain Names REG.RU LLC
hosting: custom
domain created: 2026-08-20

Identity facts, not a risk score.

assessment volume 30d: $2.07
exact assessment volume 30d (USD): 2.07
assessment recorded at (UTC): 2026-10-10T10:13:01.324Z
buyers 30d: 4
settlements 30d: 84
measured since: 2026-08-30 (start of our harvest window)
last settlement: 2026-10-10
top buyer share: 71% of 30d volume (address, not entity)
top 3 buyers share: -
concentrated volume: no
trend 7d vs 30d: 1.76x the 30d daily rate
networks: eip155:137, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpKuc147dw2N9d
volume all-time: $3.46
settlements all-time: 108
median settlement 30d: $0.02
max settlement 30d: $0.10

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: 2026-08-26

Recent checks

Latest 18 unpaid HTTP checks, newest first; response times in milliseconds, observation times in UTC
Checked at (UTC)	Status	HTTP	Response	Endpoints
2026-10-10 14:52:10 UTC	Online	402	173ms	8
2026-10-10 14:36:11 UTC	Online	402	130ms	8
2026-10-10 14:20:12 UTC	Online	402	128ms	8
2026-10-10 14:04:10 UTC	Online	402	123ms	8
2026-10-10 13:48:12 UTC	Online	402	162ms	8
2026-10-10 13:32:13 UTC	Online	402	153ms	8
2026-10-10 13:16:11 UTC	Online	402	164ms	8
2026-10-10 13:00:11 UTC	Online	402	120ms	8
2026-10-10 12:44:12 UTC	Online	402	187ms	8
2026-10-10 12:28:11 UTC	Online	402	164ms	8
2026-10-10 12:12:12 UTC	Online	402	141ms	8
2026-10-10 11:56:11 UTC	Online	402	142ms	8
2026-10-10 11:40:11 UTC	Online	402	184ms	8
2026-10-10 11:24:19 UTC	Online	402	100ms	8
2026-10-10 11:08:11 UTC	Online	402	212ms	8
2026-10-10 10:52:09 UTC	Online	402	143ms	8
2026-10-10 10:36:09 UTC	Online	402	170ms	8
2026-10-10 10:20:11 UTC	Online	402	171ms	8

Changes1 in 30d

Latest 1 recorded changes, up to 10 in the last 30 days; newest first; observation times in UTC
Observed at (UTC)	Change	Evidence
2026-10-10 12:44:12 UTC	price changed	`POST /api/attest` · eip155:137 · USDC: 20000 → 100000 `POST /api/attest` · eip155:137 · (PoS) Dai Stablecoin: 20000000000000000 → 100000000000000000 `POST /api/attest` · eip155:8453 · Dai Stablecoin: 20000000000000000 → 100000000000000000 `POST /api/attest` · eip155:8453 · USDC: 20000 → 100000 `POST /api/attest` · solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp · USDC: 20000 → 100000 `POST /api/seal` · eip155:137 · USDC: 50000 → 100000 `POST /api/seal` · eip155:137 · (PoS) Dai Stablecoin: 50000000000000000 → 100000000000000000 `POST /api/seal` · eip155:8453 · Dai Stablecoin: 50000000000000000 → 100000000000000000 `POST /api/seal` · eip155:8453 · USDC: 50000 → 100000 `POST /api/seal` · solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp · USDC: 50000 → 100000

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

all changes

Over time

On-chain volume daily snapshots, USD 30d: $2.07, peak $2.07 on 10-10*

                                                                                            $2.07
                                                                                              ██ 
                                                                                              ██ 
                                                                                              ██ 
                                                                                           ▄▄ ██ 
       ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ██ ██ 
    $0

volume

Distinct buyers per dayDistinct buyers per day

        1  2  1  1  1  1  1  1  2  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  3

Uptime 1 of 29 completed days below 100%

       ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ▇▇ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██

uptime below 100%, to scale

       09-11                                     09-25                                   10-10*

Volume 30d: $2.07
Uptime: 1 of 29 completed days below 100%

Daily on-chain settlement volume in US dollars, 2026-09-11 to 2026-10-10; highest day $2.07 on 10-10*; distinct buyers per day

Day    Volume             USD  Buyers
09-11                   $0.05       1
09-12                   $0.06       2
09-13                   $0.05       1
09-14                   $0.05       1
09-15                   $0.05       1
09-16                   $0.05       1
09-17                   $0.03       1
09-18                   $0.05       1
09-19                   $0.03       2
09-20                   $0.02       1
09-21                   $0.02       1
09-22                   $0.04       2
09-23                   $0.02       1
09-24                   $0.02       1
09-25                   $0.02       1
09-26                   $0.02       1
09-27                   $0.02       1
09-28                   $0.02       1
09-29                   $0.02       1
09-30                   $0.02       1
10-01                   $0.02       1
10-02                   $0.02       1
10-03                   $0.02       1
10-04                   $0.02       1
10-05                   $0.02       1
10-06                   $0.05       1
10-07                   $0.05       1
10-08                   $0.05       1
10-09                   $0.61       2
10-10*                  $2.07       3

More charts

Response time daily average, ms min 132ms, avg 284ms, max 589ms

       ▃▃ ▃▃ ▂▂ ▂▂ ▂▂ ▄▄ ▃▃ ▃▃ ▄▄ ▆▆ ▃▃ ▄▄ ▄▄ ▅▅ ▄▄ ▅▅ ▄▄ ▄▄ ▅▅ ▄▄ ▄▄ ▆▆ ▅▅ ▃▃ ▃▃ ██ ▅▅ ▃▃ ▂▂ ▂▂

09-11 to 10-10* UTC

      ▃▃▂▂▂▄▃▃▄▆▃▄▄▅▄▅▄▄▅▄▄▆▅▃▃█▅▃▂▂

      09-11         09-25     10-10*

Scores over time

x402 compliance low 14/14, high 14/14

       ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄ ▄▄

09-11 to 10-10* UTC

      ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄

      09-11         09-25     10-10*

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

       ▁▁ ▁▁ ▁▁ ▃▃ ▃▃ ▃▃ ▃▃ ▃▃ ▃▃ ▃▃ ▇▇ ▇▇ ▅▅ ▅▅ ▅▅ ▅▅ ▄▄ ▄▄ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▁▁ ▃▃ ▃▃ ▃▃ ▃▃ ▃▃ ▃▃

09-11 to 10-10* UTC

      ▁▁▁▃▃▃▃▃▃▃▇▇▅▅▅▅▄▄▁▁▁▁▁▁▃▃▃▃▃▃

      09-11         09-25     10-10*

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

       ▁▁ ▁▁ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇ ▇▇

09-11 to 10-10* UTC

      ▁▁▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇

      09-11         09-25     10-10*

       09-11                                     09-25                                   10-10*

      09-11         09-25     10-10*

Scores: one day per column, 09-11 to 10-10*, on the columns of Response time. Uptime held below 100% on some days 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/khotem-cryptographic-witness/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: $3.59, peak $2.07 on 10-10*. 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: 2026-09-11 to 2026-10-10 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.

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 2026-10-10 10:13:01 UTC. Each UTC day uses its last recorded run; missing readings stay unmeasured. Assessment history JSON · Measurement methodology.

Daily values, 2026-09-11 to 2026-10-10: 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
Day	Volume	Buyers	Settlements	Uptime	Response	Compliance	Price percentile	Site signals
2026-09-11	$0.05	1	2	100%	216.04ms	14/14	p65	4/6
2026-09-12	$0.06	2	3	100%	226.02ms	14/14	p65	4/6
2026-09-13	$0.05	1	2	100%	155.88ms	14/14	p65	6/6
2026-09-14	$0.05	1	2	100%	131.88ms	14/14	p66	6/6
2026-09-15	$0.05	1	2	100%	178.01ms	14/14	p66	6/6
2026-09-16	$0.05	1	2	100%	278.45ms	14/14	p66	6/6
2026-09-17	$0.03	1	1	100%	255.16ms	14/14	p66	6/6
2026-09-18	$0.05	1	2	100%	251.40ms	14/14	p66	6/6
2026-09-19	$0.03	2	2	100%	296.43ms	14/14	p66	6/6
2026-09-20	$0.02	1	1	100%	406.34ms	14/14	p66	6/6
2026-09-21	$0.02	1	1	100%	245.16ms	14/14	p69	6/6
2026-09-22	$0.04	2	3	100%	314.44ms	14/14	p69	6/6
2026-09-23	$0.02	1	1	100%	310.28ms	14/14	p68	6/6
2026-09-24	$0.02	1	1	100%	344.00ms	14/14	p68	6/6
2026-09-25	$0.02	1	1	100%	321.74ms	14/14	p68	6/6
2026-09-26	$0.02	1	1	100%	389.97ms	14/14	p68	6/6
2026-09-27	$0.02	1	1	100%	324.51ms	14/14	p67	6/6
2026-09-28	$0.02	1	1	98.89%	277.66ms	14/14	p67	6/6
2026-09-29	$0.02	1	1	100%	337.63ms	14/14	p65	6/6
2026-09-30	$0.02	1	1	100%	281.67ms	14/14	p65	6/6
2026-10-01	$0.02	1	1	100%	285.79ms	14/14	p65	6/6
2026-10-02	$0.02	1	1	100%	426.40ms	14/14	p65	6/6
2026-10-03	$0.02	1	1	100%	368.48ms	14/14	p65	6/6
2026-10-04	$0.02	1	1	100%	225.67ms	14/14	p65	6/6
2026-10-05	$0.02	1	1	100%	223.73ms	14/14	p66	6/6
2026-10-06	$0.05	1	2	100%	588.61ms	14/14	p66	6/6
2026-10-07	$0.05	1	2	100%	343.22ms	14/14	p66	6/6
2026-10-08	$0.05	1	2	100%	221.69ms	14/14	p66	6/6
2026-10-09	$0.61	2	24	100%	151.00ms	14/14	p66	6/6
2026-10-10*	$2.07	3	13	100%	149.09ms	14/14	p66	6/6

Alternatives in Verification

scvd.store · evidence observatory for the x402 economy strong 94/100 100% up 30d $293.00 30d

Rubric Protocol · Post-Quantum AI Attestation solid 93/100 99.8% up 30d $33.39 30d

PHION Agent Services solid 89/100 99.9% up 30d $1.56 30d

KushBitx AgentProof solid 89/100 100% up 30d $1.52 30d

HexScan solid 88/100 100% up 30d $0.32 30d

5 of 116 other ranked services in Verification, ordered by the same measured score.

Own this service?

Keep this listing accurate. Ownership is proven with a domain check and every change is reviewed by hand.

Update this listing

Embed a badge

HTML

<a href="https://x402-list.com/services/khotem-cryptographic-witness?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/khotem-cryptographic-witness.svg" alt="KHOTEM — Cryptographic Witness listed on x402-list" height="28">
</a>

Markdown

[![KHOTEM — Cryptographic Witness on x402-list](https://x402-list.com/badge/khotem-cryptographic-witness.svg)](https://x402-list.com/services/khotem-cryptographic-witness?utm_source=badge&utm_medium=referral&utm_campaign=embed)

HTML, live uptime variant

<a href="https://x402-list.com/services/khotem-cryptographic-witness?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/khotem-cryptographic-witness.svg?data=uptime" alt="KHOTEM — Cryptographic Witness uptime on x402-list" height="28">
</a>

Delisting

To request delisting, email info@x402-list.com or update your listing at /services/khotem-cryptographic-witness/update.