Evidence row 2828

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": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "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": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "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":"69a488d7f60372ab7ff6248490e98799da0664f7dac2cba39d2bc09aa734dbac","id":2828,"kind":"listing","method":"baseline/1","observed_us":1793025267337838,"prev":null,"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 2026-10-26 (296695 rows).

1. 0x697e6f71c471298aec4aa3b97d9c56b69b1ffe1a2092461ffb520fbf2ea53e8f
2. 0x96b25673be76ce248a11ebe84bdc028b99b0d18bc7010f53d52588387a40b90a
3. 0x03e8e06247f4736617c6fb13e3680d67e8da63785c72163920f9a557fd783459
4. 0x65b1483c120de96ab964687c6aafccd017e77c8087fec5d9b8706fd508e58c46
5. 0x71fb7b776e76c9fb4648e034b475f78b2c5df2a9e2e9959631dee9ea7212d2a7
6. 0xf135526d7b4d59f0fa2f9acc81ce60ad1577e8048ceb02dcf1c90fbd431819c4
7. 0x99988f51fc9030c831d2dfdc3f256fcd76693a47dfc8a52b03554a5f2e0d0811
8. 0xea567d19f5d753aacabc18ad840eb2f3ab984a0f9f550c3e34656af06d0d2299
9. 0xcfea3d374e09f3953efca8897edd1e7d29fad8cb44d3ae4b2edf59bc292470ca
10. 0x6b4a90af13dfa1f8aab9268ee64011e6443b055ffb0f0f11e33c1a0847946fc9
11. 0xe8b20383a9232d45872f50d7c4c484b3ffe756328a5a1e2d63218cd46b95695c
12. 0x9483a0a7a066ffc2fb890c8f34dbc91bf373e546e4a3800b76064288b3cc4875
13. 0x5f350d70c252ff1169c0210fd45fce1b0ab8d7316f048741a9e90a6c8cb65dcf
14. 0x9a79c65e077cd9da9d436b3ade6f5ddc0d244510c4d5903ef2f02d81205f7666
15. 0xa2d436d488e3600b0e5c3e3ed9c9234cd52853c59830b786334fd0c4292d9f40
16. 0x47b89901b0f07938a6b9a66ddf35683903f79d756a7c7763665fd632758b08d0
17. 0x9a83be955a206deb65b995adfd92c58fa31c95fbbf926bd199d300e70b08b26d
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae