Evidence row 18494

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://api.firstmention.uk/s/txpreflight/verify"
    ]
  ],
  "name": "txpreflight",
  "owner_address": "0xe029fcf4ba573f6fdc282208fe855df8cbb3ca9a",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xe029Fcf4ba573F6fdc282208fe855dF8CBb3Ca9A",
        "scheme": "exact"
      }
    ],
    "description": "Base agent toolbox. /preflight simulates a tx (revert reason, gas, EIP-1559 fees in ETH and USD) before you sign. /verify reads a receipt and proves a USDC transfer settled: confirmations, amount, sender, recipient.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "amount_usd": 5,
              "pay_to": "0xe029fcf4ba573f6fdc282208fe855df8cbb3ca9a",
              "tx": "0x54002146b9c089ad89c91d1750b45d0c35e133caa5b0a536df8f57e9c2a4a74b"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "block": 53042026,
              "chain": "base",
              "check": {
                "amountMet": true,
                "asset": "USDC",
                "recipientMet": true
              },
              "confirmations": 27804,
              "ok": true,
              "status": "success",
              "verdict": "settled"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "headers": {
                  "additionalProperties": {
                    "type": "string"
                  },
                  "type": "object"
                },
                "method": {
                  "enum": [
                    "GET",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "amount_usd": {
                      "description": "/verify: minimum USD that must have transferred",
                      "type": "number"
                    },
                    "asset": {
                      "description": "/verify: ERC-20 to check (default USDC on Base)",
                      "type": "string"
                    },
                    "pay_from": {
                      "description": "/verify: require this sender",
                      "type": "string"
                    },
                    "pay_to": {
                      "description": "/verify: require this recipient",
                      "type": "string"
                    },
                    "tx": {
                      "description": "Transaction hash, 0x + 64 hex",
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "block": {
                      "type": "number"
                    },
                    "chain": {
                      "type": "string"
                    },
                    "check": {
                      "properties": {
                        "amountMet": {
                          "type": "boolean"
                        },
                        "asset": {
                          "type": "string"
                        },
                        "recipientMet": {
                          "type": "boolean"
                        }
                      },
                      "type": "object"
                    },
                    "confirmations": {
                      "type": "number"
                    },
                    "ok": {
                      "type": "boolean"
                    },
                    "status": {
                      "type": "string"
                    },
                    "verdict": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-26T05:50:27.853Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-26T05:50:27.535Z"
    },
    "resource": "https://api.firstmention.uk/s/txpreflight/verify",
    "serviceName": "txpreflight",
    "tags": [
      "base",
      "usdc",
      "settlement",
      "x402",
      "gas"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Base agent toolbox. /preflight simulates a tx (revert reason, gas, EIP-1559 fees in ETH and USD) before you sign. /verify reads a receipt and proves a USDC transfer settled: confirmations, amount, sender, recipient."
}

What the leaf hashes

{"body":"cb7266fb2339f7faf33953b603c59348856ddcb0bafa3b037e74c1d200a50cff","id":18494,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025329236795,"prev":null,"subject":"x402_bazaar:https://api.firstmention.uk/s/txpreflight/verify","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0x16f3709791f77ef3ea041243ead149338fbd48ced48b921c78ea4cdec4f62128
2. 0x23502746066b7e2038b14d6f8f345ad73810250293c7bf0a79f2483ddc36db73
3. 0x64c8f69f4e2847b04d75b159a2fc83937d1ab512dc8445d315abfa7a46ba971d
4. 0x472f39a44f385546019bb2c5f0292a7efc811627cffd3c9fc45756c10df646af
5. 0xe7da278a5af7f51ab1d886c7213b0dde6cc156f171390af9778d5c9350c0f16b
6. 0x6b5ba3aff9e0b85a54e872d8f233d021980c1c647ebcadc6658395b920646cea
7. 0x75b167549cf33f2ab309144e04984b9f1e48c9e2ff394f526e62f0c1fa2d44ef
8. 0xc293d99e04b918d56b1645e1662d586eb630dbc39c573e9a73bdef89c244cf0b
9. 0xf501f5f17778597b0d6f853dff1cc43c59a306fdef56245f66f2308fab6a10ce
10. 0xd226fb22436e571794e0a32680a8d7a815d452f9ddba81af492daddbec0de485
11. 0x1ff0b13d2481c9da18eda22ffeb00b1ce27c383301867cb629c19e9a2e4b869a
12. 0x856fd0d049baa5f07cd2d5d524b40c994bed22cb46ea15af4cc075b3f3f3d444
13. 0x32f46c5f73ecbfd4f770f7f760a79bee2afed4b3e7572fa882b3e7dce8df4356
14. 0x770e4376196188c7fc9ec40f8e218dc0d1cb92bba5fe0425a0edce27ca9a997f
15. 0x60582ab4b41e72eb70eb0bce07fbf0fb4d2b62a8bad5be50f5d16d511adc746c
16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae