Evidence row 3756128

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": "1",
          "l30DaysUniquePayers": "1"
        },
        "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": "1",
          "l30DaysUniquePayers": "1"
        },
        "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":"3412602b8a250739c6f8958ddec74b7c8aef409de8976c3bc69c1ac1750beb5b","id":3756128,"kind":"listing","method":"sync.agentic_market/1","observed_us":1793989755274331,"prev":1784794,"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 2026-11-06 (303443 rows).

1. 0x7efea9bc0413d2e84116788ff0a5881f695602c818179db0dd8f4c6b9a58b6c3
2. 0x6a36b2ac87c074e89af205bd328db0de08bfd0f11262498879be64010a53a6cb
3. 0x71dc8d1b294f2b72a5d843a6fdd6bec34acad7f7c48054d4a352492c4d2d44ec
4. 0x31b4d24e4b264491afecda1606c1bb2296ebd5648011e05fa3e934e6010d58e0
5. 0xc91b6a3c5f6d84cbc11a3b95f5369f8ea703c3da409020ba40e3657bc611415d
6. 0x9d0da4b51c1a354b447be8c33cf459f59ef9aa76f0388a8420570573d21ac168
7. 0x771a2a46138c4eff7aae06ce55d59fff4ef52a3779c5136cb860bdff8a919117
8. 0x597c04bf83fcfc355c1feacb62006df63bf19c6d33fb73e86a17fd597401e655
9. 0x3118db8ef977c54820fe28a3a59cdc7e5c2dfeed647179b6ef8a0074fde31d97
10. 0xd24d48550f4198eef589675368f26707deb96fee1878f65c8f9505481d67d909
11. 0x9f678b63ee8627a3df74018cb9f533bb7f9537038a30f27f7b1da2b5fccc9ba0
12. 0xf5390d5bedfe930e82242f827e9a54aa0dd165c5724803b3a6afc36399716c9e
13. 0x89e86fdab677858fce587b6892b9ffc4fbf139424c0e40d61dae57526f7eb1f9
14. 0x6aa61e674b3c29ca9cbf3bb85eb5c666ed7c7ae477218e53a6b5bd9b7314a653
15. 0x4aa18de7ba70c1384dfa5e9fde2ce72817bb169f51aa0c98d197468e304aabd5
16. 0xa020619e8f130eeb03f3c2beaba0422017bd8b95688ddf44db1c31cf0fd40a6a
17. 0xe98c6c6b56a21a2fc4c1edfe2563812e690a6a4336d11aef772ac1799d1ee7ca
18. 0xd422a75f6c3780ed53eca52b50bf40b8f17dc14cffb804142e44fc9f2672029d
19. 0xc0d08d48601d1be90bcfc025e66bcaa0030120d688dd9c919b36c2c4446f4948

Day root

0xb30ccefe7182c6f767e1fcbfb5f64ffd649da831f665f65c5ff39cd40512284f

Chained

0xc383f7ef68d2914082484765aa09e42c12c59a74a096ae64127c562618c506d3

Published

On Arc Testnet, block 71111178: 0xfba13cb7ee4ada7f2fee3702a786a2201596be2ffea37dfc281ab4c8e9942fe1