Evidence row 527101

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": "2026-10-27T10:00:53.843Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-27T10:00:53.488Z"
    },
    "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":"bcc39465d6f57cda63a977e0bedbf64e42856b974b1ef73a01c31178d86dae11","id":527101,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793124794296120,"prev":452155,"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 2026-10-27 (273461 rows).

1. 0xccb83dfd6ab3fe84a01c01b700c94fda9bdb0c5dec89d8d7e270bd5c10e9386a
2. 0xa83ca01f59ffb971d6fa8486ad214e8de4cc58734310f6ac65023ac8852ca4c0
3. 0x0652258273401e36af8657946e3586002678840dfc987b5c6f43b53ec529635a
4. 0xc894a2e0d02b02564915d3ce0e4c8aff4a3ca71ca08798a80e9d059a81e8bcaa
5. 0x28e92cc7781579ff0af3fee72d76ad839c4ebddaaec97dc6035a2d36ea80a446
6. 0xcd1570f3d422bce4c76ce70d1140b9573a23ec7444cf1712515ceb05e745fe98
7. 0xff910b74cc391025c70cd45b9256a77c01bad8d66e755de23abd2d65169077e8
8. 0xafd4658b4d6f8a90031e87d34cc12b92abe1c874578cd51ee4a69a1f98a6d83c
9. 0xac15dafbec928364e6fbd32eb26e80422c838965fb1805b543360fdf64e1329d
10. 0x6903dfc6a8eef68f78bd5dca209fb04016ed07e4688163fadd127d834549d06e
11. 0x4eb72d2edb3b063d190586d64965ee7a33e28b4ffbc292fb4be0995ba6f8daa5
12. 0x6c0803f2d7123e0bcd2a148e9fde0f429f31dc964ced287e760ee656fcd9912f
13. 0xeb77e9d1884bf470f4a13a5869956a83ac37957112a29ccb9e63ddf7791b5a0b
14. 0xcc49fd573532e5a29f5be4033f62a2eff71456c020bd2258312b98e95cfe301e
15. 0x969cd44e5a4e8dc3110540398fbf689659eb51df735c1cda5d8f021ef9ff5683
16. 0xa94627de1af0e823832e05a9069b304ecccb8c0cdb8f9cfc4f2039bfb9799dc5
17. 0xdf1105afdc109de3c09a98fc8a3864159ad964e6f49b635c105a27a1e1f14310
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4