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Evidence row 298762

Observed , by sync.x402_bazaar/1.

Kind
listing
About
source_record x402_bazaar:https://api.firstmention.uk/s/x402check/check
Recorded
Previous row
None: the first of its kind about this subject
Body SHA-256
475388235d45c7efefd9fdc7726720bceddf4d69cd67856245f7b66dd01d8d89
Leaf
0xa40a11b2b3d687e940c216ff77f3bd7464c3de24b6c2094ea38e484f04811539

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://api.firstmention.uk/s/x402check/check"
    ]
  ],
  "name": "x402check",
  "owner_address": "0x3cfd4b1afe41ad99b11881d77e2b0d9adc212f13",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x3CfD4B1AfE41ad99b11881d77e2B0d9adc212f13",
        "scheme": "exact"
      }
    ],
    "description": "Pre-flight check any x402 seller URL: fetches the 402 challenge, decodes the payment requirements (scheme, network, asset, price, payTo), flags missing discovery metadata and returns a clear verdict.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "url": "https://api.firstmention.uk/s/bizcal-api/day?country=US"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "accepts": [
                {
                  "asset": "USDC",
                  "network": "base",
                  "payTo": "0x3CfD...",
                  "price_usd": 0.01,
                  "scheme": "exact"
                }
              ],
              "status": 402,
              "url": "https://api.firstmention.uk/s/bizcal-api/day?country=US",
              "verdict": "ok",
              "warnings": [],
              "x402": true
            },
            "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": {
                    "url": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "accepts": {
                      "items": {
                        "properties": {
                          "asset": {
                            "type": "string"
                          },
                          "network": {
                            "type": "string"
                          },
                          "payTo": {
                            "type": "string"
                          },
                          "price_usd": {
                            "type": "number"
                          },
                          "scheme": {
                            "type": "string"
                          }
                        },
                        "type": "object"
                      },
                      "type": "array"
                    },
                    "status": {
                      "type": "number"
                    },
                    "url": {
                      "type": "string"
                    },
                    "verdict": {
                      "type": "string"
                    },
                    "warnings": {
                      "type": "array"
                    },
                    "x402": {
                      "type": "boolean"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-26T20:30:15.261Z",
    "quality": {
      "lastCalledAt": "2026-10-26T20:30:15.261Z"
    },
    "resource": "https://api.firstmention.uk/s/x402check/check",
    "serviceName": "x402check",
    "tags": [
      "x402",
      "payments",
      "validator",
      "usdc",
      "developer"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Pre-flight check any x402 seller URL: fetches the 402 challenge, decodes the payment requirements (scheme, network, asset, price, payTo), flags missing discovery metadata and returns a clear verdict."
}

What the leaf hashes

{"body":"475388235d45c7efefd9fdc7726720bceddf4d69cd67856245f7b66dd01d8d89","id":298762,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793052598492273,"prev":null,"subject":"x402_bazaar:https://api.firstmention.uk/s/x402check/check","subject_kind":"source_record"}

Proof

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

  1. 0xa40a16696446ecc0b53cb573db0bf5d058c1cd5ac4c1bd7cbbb943680dc6ace7
  2. 0x9189d871cae743b48a49bfcc3aa734b7b536ddefdf901942dc86ca7a8aa4e089
  3. 0x64b78a1157454cb59227596a8512a73d78787d50a098f950c04cd19e11793060
  4. 0x1b48d84a8bea38ee8e6e55d5fd35c8ab594bf266f94a884a03f395121ec292b9
  5. 0xe04813d2c09c19557deba2e42667d5a40a6f4761df15ea0edaf21c53240b9d0e
  6. 0x14c212a47689d557a7738fafa70119c9a2006658ee224e3fbf1275daafb69f3e
  7. 0xb02ff3036fe3986ac5272006a4ddd509593e1419cc8e60bab48ba961b5114835
  8. 0xcf1be0ce1e98f9b6de8c60cc3b21f14ebdd13a1574ee95b7df0436c724ce1224
  9. 0xc7f2f5b3daead6ffc6655816ed90d85a4642b08e84aa867c9b2ca924dc7a356c
  10. 0x98005a23cbe74a9cdea08497a91d96ddecf46b8942b406963266e78529eea12d
  11. 0xf02ec0f13d875e636ca9d24097cc2a185cdb09429c8c4ade598b8089f42bb140
  12. 0x19537c574979327583a539261287714af2eee831125de819abab0f155acd3a75
  13. 0xc34c13c58ba9c342ea1b833ac1882a4aea22777c4fd1092b2f83d3bac6b9f845
  14. 0x428106f4ae4ec142f17aebf6fa50935242f8d3f1c211cf95d6351d03d11da2b7
  15. 0x62a900133713919f4eed33d8336876b7a6d538233b8a4f3ed03b29aa44f5bad0
  16. 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
  17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
  18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
  19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
Day root
0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained
0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published
On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON