Evidence row 3959964

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://math.openverbs.com/v1/eval"
    ],
    [
      "x402",
      "https://math.openverbs.com/v1/variables"
    ]
  ],
  "name": "math.openverbs.com",
  "owner_address": null,
  "raw": {
    "caip2_networks": [
      "eip155:8453"
    ],
    "category": "",
    "description": "",
    "domain": "math.openverbs.com",
    "endpoints": [
      {
        "description": "Evaluate a mathematical expression with optional named variables — arithmetic, comparison and logic operators plus functions like sqrt, abs, min, max, sin, cos, log, floor, round, etc. A syntax error, an undefined variable, or a non-finite result is a clean 400. The factorial operator is disabled for safety.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "2*(3+4)",
            "group": "body",
            "name": "expression",
            "required": false,
            "type": "string"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 2,
            "group": "body",
            "name": "precision",
            "required": false,
            "type": "number"
          }
        ],
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": null,
        "serviceName": "Evaluate expression",
        "tags": [
          "evaluate math expression",
          "calculator api",
          "compute formula",
          "expression evaluator",
          "math with variables"
        ],
        "url": "https://math.openverbs.com/v1/eval"
      },
      {
        "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.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "example",
            "group": "body",
            "name": "expression",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.004",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": null,
        "serviceName": "List expression variables",
        "tags": [
          "list formula variables",
          "extract expression variables",
          "parse variables in math",
          "formula input discovery",
          "expression variable lookup"
        ],
        "url": "https://math.openverbs.com/v1/variables"
      }
    ],
    "enriched": false,
    "iconUrl": "",
    "id": "math-openverbs-com",
    "integrationType": "",
    "isNew": false,
    "name": "math.openverbs.com",
    "networks": [
      "Base"
    ],
    "priceSummary": {
      "avgCostBasis": "exact",
      "avgCostPerTransaction": "0.004",
      "currency": "USDC",
      "maxAmount": "0.004",
      "minAmount": "0.004"
    },
    "provider": "math.openverbs.com",
    "providerUrl": "",
    "serviceName": "",
    "tags": [
      "evaluate math expression",
      "calculator api",
      "compute formula",
      "expression evaluator",
      "math with variables",
      "list formula variables",
      "extract expression variables",
      "parse variables in math",
      "formula input discovery",
      "expression variable lookup"
    ]
  },
  "source": "agentic_market",
  "summary": ""
}

What the leaf hashes

{"body":"3717950f968fbea669d8ed774571af2c1bd65c6e6c9b8eee40a49d104798ad1d","id":3959964,"kind":"listing","method":"sync.agentic_market/1","observed_us":1794076232601266,"prev":3756128,"subject":"agentic_market:math-openverbs-com","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-07 (195826 rows).

1. 0x4f8ef251bdec180601f35f65b66dc0f42da91fefcc6cd2011911874b79021cb8
2. 0xb99ce6cfba49eb991b192b81f42a165177bf3ea56aee7276965d6cfcac6ba447
3. 0xaf67d671a039fa9ea0e16e21ff84a1381ed73ff83a529b513cc08cfefc331b80
4. 0x606d615c1a8f9f7df1041cfc148ff24813b2759b5d088c07d0c2b2200024de47
5. 0x052730fa009b1549dc0c0b0d142c16dabd020e96c27fdb64a57a4d6c629e2a2e
6. 0x7a37784116090f909a3294deeb4b87d64374b5281c3c1d7f8939e0bb544c4589
7. 0x36b6d493fe089043d0c1d38f95d6c746ff22e350ad776dd46e430813b6110ff6
8. 0x1c940779b2e535774b1999365d108b6fce5ad08632733a2cc03f7ab389ea0853
9. 0x05a0ad285cf3256ebabb82affe4d069cd4960e18860faf01f62a0e338b70e9ef
10. 0x50a476efebeb6d5919c7c809f5bf2404e039e0e8941ef4e3c23891c3990f82a8
11. 0x9a13ba2c9b9d0b73b1f55adaff8ebc3752ef474977cc27ecf167952a99206c29
12. 0x747896b2eadc2b959f9bc7c541a0f340ba3f7dee5ccc6e2282938abbb193d95e
13. 0x9da5d20b5fb1961ee21cddbb09c2bcc37e0126a8a9f9bec5a9ba8207fa6b6afb
14. 0xd65824e287abd80d02260ba918668ef1c4c1d016243891677bfc31ebb1eb16e7
15. 0x1440bd4864ece4f3cb1a2fc48e88ddbd78cefd359ae16ceeb69a13e36b55021a
16. 0xf0a56561418cd0342a328707933cc222d8fa725efff7ffd081e0226ee8c46c0b
17. 0x54292a94f447f1fd33c01b5c99da465043f11022958626a2ea562c457fef697a
18. 0xff23fa8a9de3f957315ef0dfe7e8d8f6b1a51dae05fef7615c59794e019ff05c

Day root

0x17da9e85e1b138541355d33543ff34e3503cd3a49d37728fb53643e2a0416a2d

Chained

0xed34bd4af17282643de8cb9591c84d0aa1b39e1e9ae9864941e543f5a15718cb

Published

On Arc Testnet, block 71280839: 0xc3f6784179e0ca32236ba89472473e882a81d03fcc5ce27ca58ded2e01e112aa