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payment-readyonline

payment-ready until 2026-10-21

Pay-per-call chain data for agents on Base, Arbitrum, Ethereum and Optimism: gas with USD cost estimates, latest block, USD prices, wallet balances with USD values, ERC-20 token data with DEX market stats, address classification (EOA, EIP-7702, Safe multisig, proxy, token), ERC-20 allowance checks, decoded transactions, x402/USDC payment receipt verification and verifiable block-hash randomness. x402 v2, USDC on Base via the CDP facilitator, $0.001-$0.003 per call, no API key.

plainchain.appin60.com ↗

Call it x402 v2

x402 v2

Base URL
https://plainchain.appin60.com
Payment
x402 v2, header channel
$ curl -i 'https://plainchain.appin60.com/v1/address'

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

Endpoints 10 paid routes on plainchain.appin60.com

GET/v1/addressBase$0.001942since 10-14
GET/v1/allowanceBase$0.001042since 10-14
GET/v1/balancesBase$0.001942since 10-14
GET/v1/blockBase$0.001042since 10-14
GET/v1/gasBase$0.001042since 10-14
GET/v1/priceBase$0.001042since 10-14
GET/v1/randomBase$0.001042since 10-14
GET/v1/tokenBase$0.001942since 10-14

2 more in Example 402 response

Prices as captured in the 402 response: median $0.001492 across the 10 endpoints, unchanged since first capture.

Example 402 response

Endpoints and prices

Current paid endpoints; minimum quoted prices in USD where available; first capture dates in UTC
MethodPathDescriptionPriceNetworkAsset402 channelCaptured
GET/v1/addressNo description$0.001942BaseUSDCheadersince 10-14
GET/v1/allowanceNo description$0.001042BaseUSDCheadersince 10-14
GET/v1/balancesNo description$0.001942BaseUSDCheadersince 10-14
GET/v1/blockNo description$0.001042BaseUSDCheadersince 10-14
GET/v1/gasNo description$0.001042BaseUSDCheadersince 10-14
GET/v1/priceNo description$0.001042BaseUSDCheadersince 10-14
GET/v1/randomNo description$0.001042BaseUSDCheadersince 10-14
GET/v1/tokenNo description$0.001942BaseUSDCheadersince 10-14
GET/v1/txNo description$0.002942BaseUSDCheadersince 10-14
GET/v1/x402/receiptNo description$0.002942BaseUSDCheadersince 10-14

Payment evidence

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

First of 10 payloads captured by the monitor.

115 lines, scroll inside

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1942",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/address",
    "mimeType": "application/json",
    "description": "What is this address? Classifies any address on Base, Arbitrum, Ethereum or Optimism as a plain wallet (EOA), EIP-7702 delegated wallet, Safe multisig (owners and threshold), upgradeable proxy (implementation and admin), ERC-20 token or other contract, with owner(), nonce and ETH balance. Use before sending funds to or trusting an address."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base",
            "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "type": "contract",
            "chain": "Base",
            "erc20": {
              "symbol": "USDC",
              "decimals": 6
            },
            "proxy": {
              "admin": "0x3abd...",
              "standard": "EIP-1967",
              "implementation": "0x2ce6..."
            },
            "address": "0x8335...",
            "summary": "ERC-20 token USDC; upgradeable proxy (EIP-1967) -> 0x2ce6..."
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "address"
                ],
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  },
                  "address": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "description": "any address"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}
Other captured 402 responses (9)

Captured payload 2 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1042",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/allowance",
    "mimeType": "application/json",
    "description": "ERC-20 approval check on Base, Arbitrum, Ethereum or Optimism: how much a spender may move from an owner's balance, flagged if unlimited. Use before trading, or when auditing a wallet's open approvals."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base",
            "owner": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
            "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "spender": "0x000000000022D473030F116dDEE9F6B43aC78BA3"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "risk": "Spender can move the owner's entire balance of this token at any time. Revoke if you no longer use it.",
            "chain": "Base",
            "symbol": "USDC",
            "allowance": "unlimited",
            "unlimited": true
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "owner",
                  "token",
                  "spender"
                ],
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  },
                  "owner": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "description": "token holder"
                  },
                  "token": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "description": "ERC-20 token"
                  },
                  "spender": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "description": "approved spender, e.g. a router or Permit2"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 3 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "2942",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/tx",
    "mimeType": "application/json",
    "description": "Transaction status and plain-English details on Base, Arbitrum, Ethereum or Optimism: success or reverted, confirmations, fee in ETH and USD, and every ERC-20 transfer decoded with symbols and amounts. Use to confirm a transfer, swap or payment landed."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "hash": "0x6863ff402c188f6d652c300cf815cdfdf96553a89dfe8457e1099ffc9199582d",
            "chain": "base"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "fee": {
              "eth": 4.1e-7,
              "usd": 0.00104
            },
            "chain": "Base",
            "status": "success",
            "confirmations": 3820001,
            "tokenTransfers": [
              {
                "to": "0x36c3...",
                "from": "0x4c29...",
                "amount": "0.01",
                "symbol": "USDC"
              }
            ]
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "hash"
                ],
                "properties": {
                  "hash": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{64}$",
                    "description": "transaction hash"
                  },
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 4 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "2942",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/x402/receipt",
    "mimeType": "application/json",
    "description": "Verify an x402 or USDC payment on-chain from its transaction hash: payer, recipient, amount and token, whether it was an EIP-3009 transferWithAuthorization (x402 exact scheme), the settling facilitator, confirmations, and optional match checks against an expected payTo and minimum amount. Use to prove a payment before delivering, or to audit receipts."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "hash": "0x6863ff402c188f6d652c300cf815cdfdf96553a89dfe8457e1099ffc9199582d",
            "chain": "base",
            "payTo": "0x36c37d1b47737ba2b2a2cf1b5bc38509516b222f",
            "amount": "0.01"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "checks": {
              "payToMatches": true,
              "amountMatches": true
            },
            "scheme": "EIP-3009 transferWithAuthorization (x402 exact)",
            "payment": {
              "payTo": "0x36c3...",
              "payer": "0x4c29...",
              "amount": "0.01",
              "symbol": "USDC"
            },
            "verified": true,
            "confirmations": 3820001
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "hash"
                ],
                "properties": {
                  "hash": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{64}$",
                    "description": "settlement transaction hash"
                  },
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  },
                  "payTo": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "description": "optional expected recipient"
                  },
                  "amount": {
                    "type": "string",
                    "description": "optional minimum expected amount in token units, e.g. 0.01"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 5 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1042",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/random",
    "mimeType": "application/json",
    "description": "Verifiable random coin flip, dice roll and integer from the latest Base block hash (optionally salted), with the formula to recompute it. Use for fair picks, giveaways, tie-breaks and games where anyone must be able to check the result."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "max": "100",
            "sides": "6"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "int": 57,
            "max": 100,
            "coin": "heads",
            "dice": 4,
            "block": 36581662,
            "chain": "Base",
            "sides": 6,
            "blockHash": "0x9c1e..."
          }
        }
      },
      "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": [],
                "properties": {
                  "max": {
                    "type": "string",
                    "description": "integer range 1..max (default 100)"
                  },
                  "salt": {
                    "type": "string",
                    "description": "optional salt, e.g. a raffle id"
                  },
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  },
                  "sides": {
                    "type": "string",
                    "description": "dice sides, 2-1000 (default 6)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 6 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1042",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/gas",
    "mimeType": "application/json",
    "description": "Current gas price on Base, Arbitrum, Ethereum or Optimism, with the USD cost right now of an ETH transfer, ERC-20 transfer, DEX swap and NFT mint. Use before sending a transaction to pick a chain or decide whether to wait."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "block": 36581662,
            "chain": "Base",
            "ethUsd": 2527.2,
            "chainId": 8453,
            "estimates": {
              "dexSwap": {
                "eth": 0.00000108,
                "gas": 180000,
                "usd": 0.00273
              },
              "ethTransfer": {
                "eth": 1.26e-7,
                "gas": 21000,
                "usd": 0.000318
              },
              "erc20Transfer": {
                "eth": 3.9e-7,
                "gas": 65000,
                "usd": 0.000986
              }
            },
            "baseFeeGwei": 0.005,
            "gasPriceGwei": 0.006,
            "priorityFeeGwei": 0.001
          }
        }
      },
      "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": [],
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 7 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1042",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/block",
    "mimeType": "application/json",
    "description": "Latest block on Base, Arbitrum, Ethereum or Optimism: number, hash, timestamp, age in seconds, base fee, gas used and transaction count. Use to check chain liveness or get a fresh block reference."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "hash": "0x9c1e...",
            "chain": "Base",
            "number": 36581662,
            "chainId": 8453,
            "gasUsed": 61234567,
            "txCount": 212,
            "gasLimit": 300000000,
            "timestamp": "2026-10-13T08:40:01.000Z",
            "ageSeconds": 1,
            "baseFeeGwei": 0.005
          }
        }
      },
      "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": [],
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 8 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1042",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/price",
    "mimeType": "application/json",
    "description": "USD spot price for up to 10 crypto symbols in one call (ETH, BTC, SOL, USDC, ARB, OP and any symbol listed on Coinbase). Use to value balances or convert amounts."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "symbols": "ETH,BTC"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "at": "2026-10-13T08:40:00.000Z",
            "prices": {
              "BTC": 111845.5,
              "ETH": 2527.22
            },
            "source": "Coinbase spot",
            "currency": "USD"
          }
        }
      },
      "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": [
                  "symbols"
                ],
                "properties": {
                  "symbols": {
                    "type": "string",
                    "description": "comma-separated symbols, e.g. ETH,BTC,SOL"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 9 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1942",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/balances",
    "mimeType": "application/json",
    "description": "Wallet balances with USD values on Base, Arbitrum, Ethereum or Optimism: native ETH plus USDC, USDT, WETH and the chain's major tokens, plus up to 10 extra token addresses you pass. Returns a USD total. Use before paying, bridging or reporting a portfolio."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base",
            "address": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "chain": "Base",
            "native": {
              "usd": 31.08,
              "symbol": "ETH",
              "balance": "0.0123"
            },
            "tokens": [
              {
                "usd": 152.4,
                "token": "0x8335...",
                "symbol": "USDC",
                "balance": "152.4"
              }
            ],
            "address": "0x...",
            "totalUsd": 183.48
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "address"
                ],
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  },
                  "tokens": {
                    "type": "string",
                    "description": "optional comma-separated extra ERC-20 addresses"
                  },
                  "address": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "description": "wallet address"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 10 of 10

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB442daCAE60C07bb5dB8f33C8a6c1572d8F24e83",
      "amount": "1942",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://plainchain.appin60.com/v1/token",
    "mimeType": "application/json",
    "description": "ERC-20 token lookup on Base, Arbitrum, Ethereum or Optimism: name, symbol, decimals, total supply, plus DEX market data (USD price, liquidity across pairs, 24h volume, 24h price change, FDV, oldest pair age). Use before buying, accepting or pricing an unfamiliar token."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "base",
            "address": "0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "name": "Degen",
            "chain": "Base",
            "market": {
              "priceUsd": 0.00099,
              "volume24hUsd": 32314,
              "oldestPairCreated": "2024-01-08T00:00:00.000Z",
              "priceChange24hPct": -2.1,
              "liquidityUsdAllPairs": 113268
            },
            "symbol": "DEGEN",
            "address": "0x4ed4e862860bed51a9570b96d89af5e1b0efefed",
            "decimals": 18,
            "totalSupply": "36965840682.5"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "address"
                ],
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "base (default), arbitrum, ethereum or optimism; chain ids 8453, 42161, 1, 10 also work"
                  },
                  "address": {
                    "type": "string",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "description": "token contract address"
                  }
                }
              }
            },
            "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

88/100 Solid

#14 of 73 in Blockchain. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.

Reliability
100% uptime since 10-14
Compliance
A 14/14 checks pass
Price
$0.001042 to $0.002942 p25 in Blockchain
Risk
clean no risk flag
Traction
$0.00 30d 0 buyers
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 2026-10-14. Last up 2026-10-14.

── 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, latest daily rollup (no 30d window yet), 184ms response p95, x402 compliance 14 of 14, $0.001042 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 Blockchain, 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 73 listings, this one among them: the same 73 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.

All measured facts

What it does

Pay-per-call chain data for agents on Base, Arbitrum, Ethereum and Optimism: gas with USD cost estimates, latest block, USD prices, wallet balances with USD values, ERC-20 token data with DEX market stats, address classification (EOA, EIP-7702, Safe multisig, proxy, token), ERC-20 allowance checks, decoded transactions, x402/USDC payment receipt verification and verifiable block-hash randomness. x402 v2, USDC on Base via the CDP facilitator, $0.001-$0.003 per call, no API key. Bad input returns 400 and is not charged.

Plainchain is a listed x402 Blockchain 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: 2026-09-15 to 2026-10-14 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. 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 · Blockchain

uptime · latest daily rollup
-
uptime 7d
-
uptime 30d
-
uptime 90d
-
response p95
184ms
avg response
184ms
total checks
1

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

price (min)
$0.001042
price (max)
$0.002942
category percentile (min)
p25 in Blockchain
category percentile (max)
p14 in Blockchain
endpoints / prices
10 / 3
model
tiered
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
-
registrar
-
hosting
custom
domain created
---

Identity facts, not a risk score.

assessment volume 30d
$0.00
exact assessment volume 30d (USD)
0
assessment recorded at (UTC)
2026-10-14T10:03:26.470Z
buyers 30d
0
settlements 30d
0
measured since
--- (start of our harvest window)
last settlement
---
top buyer share
-
top 3 buyers share
-
concentrated volume
no
trend 7d vs 30d
-
networks
eip155:8453
volume all-time
$0
settlements all-time
0
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
2026-10-14
Recent checks
Latest 7 unpaid HTTP checks, newest first; response times in milliseconds, observation times in UTC
Checked at (UTC)StatusHTTPResponseEndpoints
Online402365ms10
Online402307ms10
Online402454ms10
Online402421ms10
Online402372ms10
Online402278ms10
Online402184ms10

Changes0 in 30d

No changes recorded in the last 30 days.

all changes

Over time

On-chain volume daily snapshots, USD 30d: $0.00
volume no data in the payload
Distinct buyers per dayDistinct buyers per day
Uptime no completed-day data
Volume 30d
$0.00
Uptime
no completed-day data
Daily on-chain settlement volume in US dollars, 2026-09-15 to 2026-10-14; 1 day has no data in the payload; distinct buyers per day
More charts
Response time daily average, ms min 314ms, avg 314ms, max 314ms

09-15 to 10-14* UTC

Each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/plainchain/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, no volume data in the last 30d. 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: 2026-09-15 to 2026-10-14 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.

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, 2026-10-14 to 2026-10-14: 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
2026-10-14*no datano datano data100%313.75ms14/14p253/6

Alternatives in Blockchain

keyring-agent strong 98/100 99.8% up 30d $1.4k 30d
OneSource strong 96/100 100% up 30d $92.61 30d
SolEnrich strong 93/100 100% up 30d $87.39 30d
Pocket Network solid 93/100 100% up 30d $91.04 30d
Vextorium solid 92/100 98.6% up 30d $11.21 30d

5 of 72 other ranked services in Blockchain, ordered by the same measured score.

see the whole category

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

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Earn the verified tier: x402list pays a real call to this endpoint and, if it delivers, the service is delivery-verified. The fee covers the cost of the probe, not the badge; there is no refund if the call does not deliver. Agent and API only, no in-browser signing. See /api.

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