Evidence row 407802

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": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-26T20:30:14.843Z"
    },
    "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":"d923ac9febbbcf82555bd2641feed88a42eaa980b0ea580d60794260a7756ee5","id":407802,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793080252479219,"prev":298762,"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 2026-10-27 (273461 rows).

1. 0x76df56d4b608e78dc0d14292be0b4bebb86038a56db4b4cd567dd50b710083be
2. 0x9b9958d98e3a6fdd7cf99ed14797ed9dc145d2141e50721e4c0c59c9e2ec085a
3. 0x37551b1b944dd4a5ea5731e51b231704e81258f45cd1e39bf4eda258cfb30132
4. 0x536a471ba71255d87f6f1e9ef8cfdac622ec4088e53814efdce9a9433f28f701
5. 0xc7276b4149c4d165f08d9ae9b25114f47965ede277c99c48a9389ed2ff6f2952
6. 0xe8626bfe66a2e3bab98af34cc5621bb8dbfb0d62487d7ad555bef99edbe433c9
7. 0x7179660279afaa3c3c39d3eed615741741c8691e7463eafdcd9403c05e9b17d6
8. 0x8b385ac2c19434c2f920a08cfa5301e4e66c7a047e94fdaacad8691cf2214ba1
9. 0xba188720a46ad75cdce5534ad6d2bfc47d65e889898074b5dbca6555b2a37fe5
10. 0x0dcbf51fb2ecee58e0aec94fcb361cef89d57ae5d6a06d812d391867385ddd8e
11. 0xe6bb1ce9f4488db1a61582719cb796889efd3c003080931b82d2a8a465d0fec2
12. 0x6834d22f4558c2279e3de3027a40f72cd350b3c4a2e54be57aff9ec2c9eaf01a
13. 0x4094bd5bc2ab60e4518d1ee8a13455a69d7484ea62ecdca2618d0f39d3403503
14. 0x9848c068b1371232529d2b5738fdc45b854c57da041b69ea7c9e112b14e2d9d1
15. 0x275720ecabb68df33eee92ae4fd70572a8d952d6c61c061c2869cfc3217aa5c5
16. 0x23cf9bb4337ee8be7fcae368fd69d24c62c11fb45882127b4cd919bb96a19996
17. 0x0e01aa9525097570a6edaf32bfc959de57bf5c24317cf10c0716affea85ca60d
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4