Evidence row 407556

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://quantagentshop.com/v1/page-change"
    ]
  ],
  "name": "Quant Agent Shop",
  "owner_address": "0x4d8d8d4f04512029172e0176744eec4ae5238309",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0x4d8d8D4f04512029172e0176744Eec4AE5238309",
        "scheme": "exact"
      }
    ],
    "description": "Page change check. Send a public URL and, optionally, the hash from your last check; returns the SHA-256 of the page's main text (scripts, navigation and spacing ignored) and changed true or false. Nothing is stored here; keep the hash yourself. Use to watch a page cheaply, up to 10 checks of a host a minute. Dates or counters in the text count as changes. To read the page use /v1/fetch-page. Typical response under 2 s. Failed calls are not charged.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "previous_sha256": "6f48ad30e4cc6be7e1a342177e2b549bc1ca7cbe7b903dd38a92eaf6a829b5ac",
              "url": "https://www.x402.org/"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "changed": true,
              "chars": 1790,
              "checked_at": "2026-10-22T09:00:00+00:00",
              "final_url": "https://www.x402.org/",
              "previous_sha256": "6f48ad30e4cc6be7e1a342177e2b549bc1ca7cbe7b903dd38a92eaf6a829b5ac",
              "sha256": "b5eda501c7113cf9b4dcc2955682c8c51d31d605cee98eb6971f28277ca0d646",
              "title": "x402",
              "url": "https://www.x402.org/"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "properties": {
                    "previous_sha256": {
                      "anyOf": [
                        {
                          "pattern": "^[0-9a-fA-F]{64}$",
                          "type": "string"
                        },
                        {
                          "type": "null"
                        }
                      ],
                      "default": null,
                      "description": "The sha256 from your last check, to compare against.",
                      "title": "Previous Sha256"
                    },
                    "url": {
                      "description": "Public http or https page to hash.",
                      "format": "uri",
                      "maxLength": 2083,
                      "minLength": 1,
                      "title": "Url",
                      "type": "string"
                    }
                  },
                  "required": [
                    "url"
                  ],
                  "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": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-27T02:53:56.65Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-26T18:54:59.454Z"
    },
    "resource": "https://quantagentshop.com/v1/page-change",
    "serviceName": "Quant Agent Shop",
    "tags": [
      "web-search",
      "web-scraping",
      "company-data",
      "research",
      "compliance"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Page change check. Send a public URL and, optionally, the hash from your last check; returns the SHA-256 of the page's main text (scripts, navigation and spacing ignored) and changed true or false. Nothing is stored here; keep the hash yourself. Use to watch a page cheaply, up to 10 checks of a host a minute. Dates or counters in the text count as changes. To read the page use /v1/fetch-page. Typical response under 2 s. Failed calls are not charged."
}

What the leaf hashes

{"body":"dd72211de76458cddecea7a48bca2819d752d6fbe41e895a52eef4a722001f2f","id":407556,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793080249148431,"prev":284097,"subject":"x402_bazaar:https://quantagentshop.com/v1/page-change","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. 0x8641a1051413e38e22a494d60ef21ac6339bb65871982f8dd8a46a5a4be66819
2. 0xf448393b605bd4e29dcd805646e647aaf9b1430fd48e218fa92e035ce4f28769
3. 0x8a9305f15080403d287823dfb8f8bd9fdaabd304703c2851868e8a57e244dce5
4. 0x13d9d537fa6364bb2d4bcd40f6ea991a779ac5e344733bc840fdb22e609e3c90
5. 0x7fb716614af5f49742757b78107faac8755450002c2be26058782d9dcaae7a40
6. 0xa08603f448d5fb84f0ab5fae23ffa38577bc77d307147bb64021fbe56fdfa4cf
7. 0x798603c98266c6f1541c2268826654eadbb41f734ccc909258b322c26e0fa589
8. 0x487bdee24ee917953a7b26b0a20d1477cf5d35047b5d6c1d271d5b3c12ee28d0
9. 0x722c399798c4970ffe8c5bb71e88ea51da12321667c5a2d5a6b6d077280e387d
10. 0xe0951fd3c4382166fa883e673bbcb2c816119442da0fbbfc7a867cb524243cda
11. 0xa422cf0aa2444c11b145e66f51596fb564431c83c30bc600fea79ecf01652ab4
12. 0xe5ce8ac1ba4d6152605e0a032058cac5906d85f82e3fda1ad44852337b713b17
13. 0x07d414626f116f3edc6ddb34183ed02538c3a805fec6db00f9d764f8fd595d04
14. 0x4964f0806efde5ed25f60da2b45d78cd2e0f07d67e64aad2822f6016ad973c47
15. 0x3c500ec3d3edf0c74b87a6ca8fcd77656bfbe03db3d478bd0c184d0c88839c6b
16. 0xfecf3d4646dd4984a13dd715499e842c3fde63692336d97394c2bfd8e877ca5d
17. 0xf30fddbf4811226c58e8f0daf36fddd79fc5f1356b592bb1d99a8061ddbabe66
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4