Evidence row 1792086

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://pay.brianbooms.com/api/v1/data/ecb"
    ]
  ],
  "name": "Steward",
  "owner_address": "0xa98e8c6cbc64b7bb30fd0d2015ab24814c661839",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xa98e8c6cbc64b7bb30fd0d2015ab24814c661839",
        "scheme": "exact"
      },
      {
        "amount": "11970",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:137",
        "payTo": "0xa98e8c6cbc64b7bb30fd0d2015ab24814c661839",
        "scheme": "exact"
      },
      {
        "amount": "11970",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:42161",
        "payTo": "0xa98e8c6cbc64b7bb30fd0d2015ab24814c661839",
        "scheme": "exact"
      },
      {
        "amount": "11970",
        "asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:43114",
        "payTo": "0xa98e8c6cbc64b7bb30fd0d2015ab24814c661839",
        "scheme": "exact"
      }
    ],
    "description": "Use when an agent needs the ECB's official euro reference rates straight from the source file — EUR base, latest day or any date in the last 90 days, one currency or the full table. Complements the Frankfurter-based FX endpoints with the primary publication. Use permitted: build it into your products and services, paid or free. Raw redistribution of the feed itself is prohibited.",
    "extensions": {
      "bazaar": {
        "discoverable": true,
        "iconUrl": "https://brianbooms.com/favicon.ico",
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "currency": "Optional 3-letter code to return just one rate. Example: USD",
              "date": "Optional YYYY-MM-DD within the last 90 days; omit for the latest. Example: 2026-09-27"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "base": "EUR",
              "count": 1,
              "data_source": "ECB euro foreign exchange reference rates",
              "date": "2026-09-27",
              "product": "ECB euro reference rates",
              "rates": {
                "USD": 1.18
              }
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "additionalProperties": true,
          "properties": {
            "currency": {
              "description": "Optional 3-letter code to return just one rate. Example: USD",
              "type": "string"
            },
            "date": {
              "description": "Optional YYYY-MM-DD within the last 90 days; omit for the latest. Example: 2026-09-27",
              "type": "string"
            }
          },
          "type": "object"
        },
        "serviceName": "Steward",
        "tags": [
          "ecb",
          "fx",
          "forex",
          "steward",
          "x402"
        ]
      }
    },
    "lastUpdated": "2026-11-01T15:59:25.279Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T15:59:23.878Z"
    },
    "resource": "https://pay.brianbooms.com/api/v1/data/ecb",
    "serviceName": "Steward",
    "tags": [
      "ecb",
      "fx",
      "forex",
      "steward",
      "x402"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Use when an agent needs the ECB's official euro reference rates straight from the source file — EUR base, latest day or any date in the last 90 days, one currency or the full table. Complements the Frankfurter-based FX endpoints with the primary publication. Use permitted: build it into your products and services, paid or free. Raw redistribution of the feed itself is prohibited."
}

What the leaf hashes

{"body":"6ef4c3d264a218de5823f4d85f1e065e1a8fdd9f4fcef28cb8da246b776d746a","id":1792086,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793560007633480,"prev":null,"subject":"x402_bazaar:https://pay.brianbooms.com/api/v1/data/ecb","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-01 (302406 rows).

1. 0x69e54a0784470131c18499374e185c05a01670843d6fcaec68b951e36d99d927
2. 0x9af0f00ede3df9aed9e107c21496d63e484dc15304464e712abf2066427facda
3. 0xcd3f69ec7354846cec1931d65bd5ffa06b05f95e00fafc28a7ac9241313b52f8
4. 0xa95835b97cff11acb23f65053e40e412a094eff19fca39624fb744f81ff7f027
5. 0xe7288ae3ab0cb4bbdea474233ad5b6922a264bdbdc8e804a220be70e4128d86e
6. 0x332efbe1e50c8ffad30f909178622742afde395395572f69e605324c0d0410c3
7. 0x281062633056748cc59afc60071c2dca70c2d356694b641dff80a1baa29ca6eb
8. 0xe10604b2df30a0570a4c459ee247938573ee230f6c4081e7320e92572efe1792
9. 0xeaaea8b38e22456a8bd7d7181b1b17c9c6a8d66a3ae8f6148b7ed3fc8bb65512
10. 0xffec86574b8ec310b1694b45b318c35f407f370d6ea2363d87ed014ae2316da8
11. 0x7d83e6bdb335ca44467e046baaeb1d3b6c83fba6742ec9e7dcff2730f1740bbc
12. 0xb9e769552a4ec5c6497a5a5cdde2664f3c8dce153f8c781eff808dd6b24658fd
13. 0x2083851c78484f99ed7086ac61a83081da68bd1ce3b2dfd9a06ce2a7a13fdb11
14. 0x6e52ec74954b02fa6342c949413ce6ced87071b172b1bcf0f6191252f67257fa
15. 0x7c66173839ef153f08dfd346f7ea956e9226e1b7ff05bf4c6cf27436953f336b
16. 0xc1f6e8dd182b37cbb6e04d0e69486bd40d440934f8e373b9bae8cb78de508bba
17. 0x97f6f39e601b6ef0e47b730aa0488b718c0d7882ad840342bbd7d3a705a1b3a2
18. 0x1973893697931b7512ae5dc1a3c92ef92f633ae3574dce9029a35b5e94d2d364
19. 0x3315fd2757fdd435852cc277377234a3f3909a6d2a089d0e36f6d59aacfda910

Day root

0x7fa2cba1cf3d6b35630896f5fe1a650adb307ea2c376e80a5f2d9276b7cb5ab3

Chained

0x577ff89ba012beeff3197bcff7fa86752074bdf54205a24359cc437be2a952a4

Published

On Arc Testnet, block 70262758: 0x435bc1b9331471d72e1998f2e420983b5189d4da65ffbd6f27ef40daf5e1ea90