Evidence row 1792599

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://math.openverbs.com/v1/variables"
    ]
  ],
  "name": "List expression variables",
  "owner_address": "0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a",
  "raw": {
    "accepts": [
      {
        "amount": "4000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A",
        "scheme": "exact"
      }
    ],
    "description": "Parse an expression and return the free variables it references, without evaluating it — so an agent can discover which inputs a formula needs before supplying values. A syntax error is a clean 400.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "expression": "example"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "properties": {
                    "expression": {
                      "description": "The expression to inspect.",
                      "maxLength": 1000,
                      "minLength": 1,
                      "type": "string"
                    }
                  },
                  "required": [
                    "expression"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-08T05:39:58.542Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-08T05:39:58.284Z"
    },
    "resource": "https://math.openverbs.com/v1/variables",
    "serviceName": "List expression variables",
    "tags": [
      "list formula variables",
      "extract expression variables",
      "parse variables in math",
      "formula input discovery",
      "expression variable lookup"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Parse an expression and return the free variables it references, without evaluating it — so an agent can discover which inputs a formula needs before supplying values. A syntax error is a clean 400."
}

What the leaf hashes

{"body":"b8a8d107ff04b2ae9c62bb7e898d1aa8825137b9f831e0b6b67295e96100ccb4","id":1792599,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793560030435978,"prev":116730,"subject":"x402_bazaar:https://math.openverbs.com/v1/variables","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. 0x153d3b3be427bf9395b57540289289c7e98f2d360eaac4d81e5cdee8a86fee80
2. 0xb8571fcedcf9bc0a4b88a8832fcd44ba5f1d6399f39304c7134566168ecc9fed
3. 0x710cd8726c78ddbe86aa7af19944f0438aa775e85a9718deb0432654fe9815b4
4. 0x2c9def1f258745ddde2669764b467df46b8319d7c121a585c608014d08962fbc
5. 0xbe9ca2d7727de367aa81455390e14a358eb13d1eac2e6eac1af4784f51e0069e
6. 0xbfc5c39e47789c3b7d43fe28c9378606f6372e381aad513e7291213ef642bc12
7. 0xacc58c137605658bb2ef0d4bc764d296115a3fcbf748c01813249763ac1c1173
8. 0x2be7cefb05c4da3638bd2d3ff68d455cd51132f8493e2d77bd523f6163aac79c
9. 0x17bbac4e481740ad1f2ec6a378dcfa9e2f641e29a12e4a9ff9b47676810fa253
10. 0x4f5879d4b3c41a22c1a9cfb083a8cdbb2c8a13f2d56206c17b81e7d8158816e6
11. 0xfa1c8acfa3c862b417d2625d131daa4d4dcc71603eb6b0b04f7346c0a9da2b83
12. 0x66891ed1e5e8c32c74d3587c22015ee559aeb6a8e98b7d712d5c323d012e46a0
13. 0x10405c22dbe2ed0ca6e6cc381b8fb16e2b184181ad6bf0dbf94a86aec4f16b97
14. 0xa4d26e861503b80bb91bc89e98fcc6daf0fcf003f5a144540ccd91637ccdc11f
15. 0xf1aed005f71411c0df252d9623f284bcac7de199e24c4d4cd5df3e8d3348d3aa
16. 0x5cf5a0a57795246f996e480f05ed085c19d02f7d6e8fc3ddc392412466554f0f
17. 0x02b3554752e71a19b12d7a76dbff436e85387226ceec89fdebdcdaf0122c2932
18. 0x1973893697931b7512ae5dc1a3c92ef92f633ae3574dce9029a35b5e94d2d364
19. 0x3315fd2757fdd435852cc277377234a3f3909a6d2a089d0e36f6d59aacfda910

Day root

0x7fa2cba1cf3d6b35630896f5fe1a650adb307ea2c376e80a5f2d9276b7cb5ab3

Chained

0x577ff89ba012beeff3197bcff7fa86752074bdf54205a24359cc437be2a952a4

Published

On Arc Testnet, block 70262758: 0x435bc1b9331471d72e1998f2e420983b5189d4da65ffbd6f27ef40daf5e1ea90