Evidence row 277741

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://offercheck.offercheck.workers.dev/v1/fx"
    ]
  ],
  "name": "offercheck",
  "owner_address": "0xb9721fdd2ec85f7f604f5bbca2292d7c4ff6b62c",
  "raw": {
    "accepts": [
      {
        "amount": "2000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0xB9721FDD2EC85F7f604F5BBcA2292d7C4ff6B62c",
        "scheme": "exact"
      }
    ],
    "description": "Convert between 30 major currencies (USD, EUR, GBP, JPY, CHF, CNY, INR, ILS, AUD, CAD, ...) using the European Central Bank's daily reference rates: rate and converted amount for one or many target currencies, optional historical date back to 1999. Returns the ECB rate date and source. $0.002 per call.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "amount": "100",
              "from": "USD",
              "to": "EUR,GBP"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "amount": 100,
              "date": "2026-09-25",
              "fetched_at": "2026-09-25T20:00:00.000Z",
              "from": "USD",
              "ms": 95,
              "rates": {
                "EUR": {
                  "converted": 87.696,
                  "rate": 0.87696
                },
                "GBP": {
                  "converted": 75.458,
                  "rate": 0.75458
                }
              },
              "source": "European Central Bank euro foreign exchange reference rates (published once per business day ~16:00 CET) via frankfurter.dev; non-EUR pairs are cross rates through EUR",
              "warnings": []
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "amount": {
                      "default": "1",
                      "description": "Amount in the base currency to convert, as a decimal number string, e.g. \"100\" (default 1). Query parameters are strings, so the Coinbase Bazaar validator rejects a numeric type here.",
                      "pattern": "^[0-9]+(\\.[0-9]+)?$",
                      "type": "string"
                    },
                    "date": {
                      "description": "Optional historical date YYYY-MM-DD (ECB business days from 1999-01-04); omit for the latest rates",
                      "type": "string"
                    },
                    "from": {
                      "default": "USD",
                      "description": "Base currency, ISO 4217 code (default USD)",
                      "type": "string"
                    },
                    "to": {
                      "default": "EUR",
                      "description": "Target currency or comma-separated list (default EUR); any of the 30 ECB currencies",
                      "type": "string"
                    }
                  },
                  "required": [],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-26T15:58:01.07Z",
    "quality": {
      "l30DaysTotalCalls": 11,
      "l30DaysUniquePayers": 7,
      "lastCalledAt": "2026-10-26T15:58:00.738Z"
    },
    "resource": "https://offercheck.offercheck.workers.dev/v1/fx",
    "serviceName": "offercheck",
    "tags": [
      "finance",
      "fx",
      "exchange-rate",
      "currency",
      "crypto"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Convert between 30 major currencies (USD, EUR, GBP, JPY, CHF, CNY, INR, ILS, AUD, CAD, ...) using the European Central Bank's daily reference rates: rate and converted amount for one or many target currencies, optional historical date back to 1999. Returns the ECB rate date and source. $0.002 per call."
}

What the leaf hashes

{"body":"f490f88af12389f71ca214f4ec39e9a0fff0310e7f712477d3f868cbb20cd40d","id":277741,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793042041938324,"prev":261231,"subject":"x402_bazaar:https://offercheck.offercheck.workers.dev/v1/fx","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. 0x24d032c9ca371e2d869d1cdffdd7e14c8db60305df9989cc0711feed0ba45189
2. 0xfe18eddd30a90c74aae0917b75fb94d4ef72a2ec0fc85d1b941588e0f065d2d4
3. 0x8317d24bb3e0d47ec593f9df0990ae59f31df1e6ad500e7a23dce1eec5795c1e
4. 0x7c2e939ab7b3ecda407068d77d9cdac56d0bea4149845f57914168d8fb73b907
5. 0xd4bcf1ec57bfabac9ed88062b27a49c128fd2d08031314d59c50bb49b733a867
6. 0xae654e57fbbff89f912d4c0972a25eba244b6938539081587847af8d46175d1a
7. 0x644afe48cba818f407c800b09bb493390a851b062d56ae2b8903ff49594d5abf
8. 0x68d3d7fe1d8292dca391acd6b3ca8be33df4de55eab3fc7bad10899f11178de5
9. 0xc2c0139377d9d280ab951f4619a24fe372b3e8bea00b0461289356e47d5e6c25
10. 0xfe4ee9a25c2f5ad925133380f1786d74cb1b3864d5014888d5e20a14c89ec5b0
11. 0xcd59d6e87f33016070792bd627b1f58155e890e1fdf84deab560cdcb1c986874
12. 0x2ceb9cc3a43f479e6ab73db5d3d474a93995fb4188ee45f71846b4cf537a0016
13. 0x830b2c874449c7499489eba2baa67d49f991298225763c0161b471621038d0fb
14. 0xd843afcced75dedd39194ff9bd12326b88099e6112686db2299392d022dc3146
15. 0xc3a6a3ae44ec0da1848b16d40c45d7aac97a67352eea8df18e0f26edabea8a2f
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae