Evidence row 1246

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": "2026-10-26T00:16:22.652Z",
    "quality": {
      "l30DaysTotalCalls": 10,
      "l30DaysUniquePayers": 6,
      "lastCalledAt": "2026-10-26T00:16:22.508Z"
    },
    "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":"068836b9d17ac70a11089f5457c4448e66e2032e426edbe3199c63d826e27775","id":1246,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025248829668,"prev":null,"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. 0xb1a5dd97d59331b90e5163aeb88cd1f8073f285356bfcb0cd1bf68dd827bab2e
2. 0x0dbf570e01f5c9e0515e61c9638bb06ed7cce40b7f46a5feab29302594ed99bb
3. 0xaada751c6ad1aacdee181d4d899036b427839a275d62ce0d795282b1fb5ccd95
4. 0x4787ccff06cceca5989d7a550d5830aa0e75f331516eed2b7514d63c513e4ae0
5. 0xd65fa04098abb87c9263fba3e161463407b3b820c8bcdf5c9803ef8fa60ffa7e
6. 0x98e0a5d1e5d9f8f64616cf9f460ae677d1e37772d964bd9ba667e4a001adba48
7. 0x8aff08e13f967661c0d691b11e11fce1a9c66d03a060cab90490dfb282363b56
8. 0xd523e0e141f7bab8247f84ee9e15f23d1c43c72c32b0c34c876dd20ae8d20438
9. 0xce7b52aea929e25bddd38b0f456f23a397675312e4cb7db15eb3b5cd4faf39c1
10. 0xd5cd216c2216432b3046cca4e23b3c34d41ceff1aa810aa4eea5bd58437939ce
11. 0xb673e7e79847b2398685ec91a7c3b2395fccef249a8f8983b5eecc97a794a3ec
12. 0xce1aeb889b974291cea1fbfd01595655bd2c1b3636dc5b56eeb8904adb9f6c65
13. 0x3b1c0e225d1b1cb24cd5d5ea4af2de20ed68a1eaf8b61924ed1b81e4b9cf7e39
14. 0x083427e39db4dd470662401f6db5db8fadf084fc4274cf8621b368416952b78b
15. 0x1a74ed3b3756b9cd946da49701bcec120ec88645013da99fa9eea60b39e1a570
16. 0x123ec8bee20ddc55223eeef5a4f4d6c4b6416515adbb911c56759f5cde56e452
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae