Evidence row 72999

Observed 26 Oct 2026, 14:38 UTC, by baseline/1.

Kind: listing
About: source_record x402_bazaar:https://currency-api-production-4a8d.up.railway.app/rates/historical
Recorded: 26 Oct 2026, 14:38 UTC
Previous row: None: the first of its kind about this subject
Body SHA-256: 117542a2806a541a2505cc62e07102a60f73a75e915c130ae55751b09121b5cc
Leaf: 0xb044c28edaa87f9daf8c046bb151075aad4ef9f54398d135c88fd0398b4553d1

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://currency-api-production-4a8d.up.railway.app/rates/historical"
    ]
  ],
  "name": "currency-api-production-4a8d.up.railway.app/rates/historical",
  "owner_address": "0xffc458db291b4abce020fe3de4f91f2770e537b1",
  "raw": {
    "accepts": [
      {
        "amount": "1000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xFFc458dB291b4ABcE020fE3de4f91F2770E537b1",
        "scheme": "exact"
      }
    ],
    "description": "Historical fiat exchange rates for a given date (YYYY-MM-DD, back to 1999-01-04) and base currency; optionally restrict to specific targets.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "base": "USD",
              "date": "2024-01-15",
              "symbols": [
                "EUR",
                "GBP"
              ]
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "base": "USD",
              "cached": false,
              "date": "2024-01-15",
              "rates": {
                "EUR": 0.9187,
                "GBP": 0.7861
              },
              "source": "ECB via Frankfurter"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "base": {
                      "description": "Base currency ISO 4217 code, e.g. 'USD'. Defaults to USD if omitted.",
                      "type": "string"
                    },
                    "date": {
                      "description": "Date in YYYY-MM-DD format, back to 1999-01-04, e.g. '2024-01-15'.",
                      "type": "string"
                    },
                    "symbols": {
                      "description": "Optional list of target currency codes to restrict the response, e.g. ['EUR', 'GBP']. Omit for all rates.",
                      "items": {
                        "type": "string"
                      },
                      "type": "array"
                    }
                  },
                  "required": [
                    "date"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "base": {
                      "type": "string"
                    },
                    "cached": {
                      "type": "boolean"
                    },
                    "date": {
                      "type": "string"
                    },
                    "rates": {
                      "description": "Map of target currency code to historical exchange rate relative to base.",
                      "type": "object"
                    },
                    "source": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-25T20:40:01.157Z",
    "quality": {
      "l30DaysTotalCalls": 7,
      "l30DaysUniquePayers": 5,
      "lastCalledAt": "2026-10-25T20:40:00.944Z"
    },
    "resource": "https://currency-api-production-4a8d.up.railway.app/rates/historical",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Historical fiat exchange rates for a given date (YYYY-MM-DD, back to 1999-01-04) and base currency; optionally restrict to specific targets."
}

What the leaf hashes

{"body":"117542a2806a541a2505cc62e07102a60f73a75e915c130ae55751b09121b5cc","id":72999,"kind":"listing","method":"baseline/1","observed_us":1793025486921559,"prev":null,"subject":"x402_bazaar:https://currency-api-production-4a8d.up.railway.app/rates/historical","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).
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Day root: 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained: 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published: On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON