Evidence row 524424

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": "2026-10-27T10:10:21.755Z",
    "quality": {
      "l30DaysTotalCalls": 12,
      "l30DaysUniquePayers": 8,
      "lastCalledAt": "2026-10-27T10:10:21.495Z"
    },
    "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":"65852dc2ebca5ce80d81fe980c392d7c1987482b8e42abc2107ad17234895f23","id":524424,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793124736888138,"prev":450812,"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 2026-10-27 (273461 rows).

1. 0x3d4ed14126f0984395e28cf634579d003506493f4a5e722292840ac6e6a8b5fa
2. 0x73d6409f17cb1057b490305eec250e285ee5e9ced7638cda5a08350cb7c24ee0
3. 0x8fc62322dd344fcfaa325d45346d9e67f448e28f67b9c1cf73faf4b7c5559919
4. 0x50cbda4a0ccb5cda1d2d68cf2c21a7dac6f4b085b9ede873fc22672cd232de55
5. 0x0fd5e9b581b3bc4b08fd8392a6a16fbacb7a7675ba4e326b4b7291e1343475cd
6. 0xe5acfbcc2eac77b380909f441cf726ce0bb3d52c05a64f470be103ca77bcc903
7. 0x050bbb60681d1cb5df610d7798b73624a8ad7030b6f20d331a9fccccc152b88a
8. 0x7cf052655071b37cdd8fedb258e2fc270d5ae7d6f211bc504a0eb6186cf6fff8
9. 0x86261251c5019169ce9426c68de78521608abb9b3b6838b284ac9066dd8158bc
10. 0x2c7b2dd8bdb23032c549cb56bea8f8a4ae7001d581b5f30e31165a845fdddae3
11. 0x2a46b413c4a79ee979d8a40f091ba215dc98b3af9709a0311b2ff60a4cb34d60
12. 0x5bcdf911ebda5c6d942d996f5453cef161d2571921ceb388d7c8ffbdc925f4d0
13. 0x9e70d944564843a0f0d88b623d628ff2e2ac17c172d4ebe0ed141fe8b9f9dae4
14. 0x42784d9809d120654630ee1b254a1dd90a2bbd3024aa180f1a59bbf53e9316e4
15. 0x8360ee1105e4d9f9312067cbbfd47c69c5948665ae582b9684a580c8f4e199e1
16. 0x52efa60e0c3d8525486d2310eb3b6b566c9677c64fd1f819edb072cf101bcbdb
17. 0x22c1fb9487ee0b9732fa017a0cc321eb27a60c08450d112f755089796e12cb1c
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

Not published on a chain yet