Evidence row 3451

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://readability.openverbs.com/v1/grade"
    ],
    [
      "x402",
      "https://readability.openverbs.com/v1/reading-time"
    ],
    [
      "x402",
      "https://readability.openverbs.com/v1/score"
    ],
    [
      "x402",
      "https://readability.openverbs.com/v1/syllables"
    ]
  ],
  "name": "readability.openverbs.com",
  "owner_address": null,
  "raw": {
    "caip2_networks": [
      "eip155:8453"
    ],
    "category": "",
    "description": "",
    "domain": "readability.openverbs.com",
    "endpoints": [
      {
        "description": "Summarise a text's difficulty as a single consensus US grade level (averaging the five grade formulas), plus the Flesch Reading Ease, a plain-language difficulty band and an approximate age range.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "example",
            "group": "body",
            "name": "text",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "Consensus grade level",
        "tags": [
          "grade level estimate",
          "text difficulty grade",
          "reading grade level",
          "consensus readability grade",
          "age range readability"
        ],
        "url": "https://readability.openverbs.com/v1/grade"
      },
      {
        "description": "Estimate reading and speaking time for a text at configurable words-per-minute rates (defaults: 200 wpm reading, 130 wpm speaking).",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 1,
            "group": "body",
            "name": "readingWpm",
            "required": false,
            "type": "number"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 1,
            "group": "body",
            "name": "speakingWpm",
            "required": false,
            "type": "number"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "example",
            "group": "body",
            "name": "text",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "Reading & speaking time",
        "tags": [
          "reading time estimate",
          "speaking time estimate",
          "words per minute calculator",
          "estimate read time",
          "text duration api"
        ],
        "url": "https://readability.openverbs.com/v1/reading-time"
      },
      {
        "description": "Compute the standard English readability formulas — Flesch Reading Ease, Flesch–Kincaid grade, Gunning fog, SMOG, Coleman–Liau and ARI — along with the underlying sentence/word/syllable statistics. Empty text is a clean 400.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "example",
            "group": "body",
            "name": "text",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "Readability scores",
        "tags": [
          "readability score",
          "text readability api",
          "flesch score calculator",
          "reading ease analysis",
          "grade formula scores"
        ],
        "url": "https://readability.openverbs.com/v1/score"
      },
      {
        "description": "Count syllables per word and in total across the text.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "example",
            "group": "body",
            "name": "text",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "Count syllables",
        "tags": [
          "count syllables",
          "syllable counter",
          "word syllable lookup",
          "text syllable count",
          "parse word syllables"
        ],
        "url": "https://readability.openverbs.com/v1/syllables"
      }
    ],
    "enriched": false,
    "iconUrl": "",
    "id": "readability-openverbs-com",
    "integrationType": "",
    "isNew": false,
    "name": "readability.openverbs.com",
    "networks": [
      "Base"
    ],
    "priceSummary": {
      "avgCostBasis": "exact",
      "avgCostPerTransaction": "0.002",
      "currency": "USDC",
      "maxAmount": "0.002",
      "minAmount": "0.002"
    },
    "provider": "readability.openverbs.com",
    "providerUrl": "",
    "serviceName": "",
    "tags": [
      "grade level estimate",
      "text difficulty grade",
      "reading grade level",
      "consensus readability grade",
      "age range readability",
      "reading time estimate",
      "speaking time estimate",
      "words per minute calculator",
      "estimate read time",
      "text duration api",
      "readability score",
      "text readability api",
      "flesch score calculator",
      "reading ease analysis",
      "grade formula scores",
      "count syllables",
      "syllable counter",
      "word syllable lookup",
      "text syllable count",
      "parse word syllables"
    ]
  },
  "source": "agentic_market",
  "summary": ""
}

What the leaf hashes

{"body":"e2db4ac26e386d8c4e9fe6e0c38ca4982d83e623eeeb604b5517b98144a1e3ac","id":3451,"kind":"listing","method":"baseline/1","observed_us":1793025273245024,"prev":null,"subject":"agentic_market:readability-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. 0x7a109289dc95f2dc6b8a62e21fcfc55a3caaa9e22d18ee76381780f905613632
2. 0xf9725375d47d42edfe3adf9ea8a44a5c02ab7ea0071448b6c2356d646dcd4c9b
3. 0x2e3d05574aef45bcce5f92ee88f85efc7fbf8de920122f8a693f457ef6882490
4. 0x087872e9521d8a4840af026a439c4d14d212ecd6ef302cf17830306f83301481
5. 0x05d98411f5dce6e6896d6c375e027c3e73e7cf9acfe0caf057994953e400f027
6. 0x4d711bb7dc00e30d9738a1a20d9aaf659e766c3203573fc84a150cf6b423fb9d
7. 0xa281bf85ebd74d0df7b22a096241f4eaa74177c175ab78130629a603fe3b892e
8. 0x92d03ec8a7b10c17fe1781a7163b171ccd7f9bce50d0c153c49c6d1fc9376194
9. 0x2b1846c8f1a71d5ca42246b859f4f9e7f7909cb9c881869cbb1bfe38b07466f7
10. 0xd7bfe89d1c95d31c83b5cd958ac57e187ca41d9a64c12c75ed199d276c80aa6f
11. 0x1474b20023ac420a3be8200f14f9ac14f1ee93ff05411fa3760c28b2e50fb3dd
12. 0xa6406b1a5540d26e0cbd03bb274a01c10968fadb17913a6043bb9427ddfb71ba
13. 0x01c95624b1f2385ef774ee258a9ae58a4df07a1bdaa829de84e1d5201f3f39c2
14. 0x7721d38652b6444b18e1193824e50490ade04851ce6221771f6e374c4527d80f
15. 0x15039087bf60ae9b06b756ec3cbc299760e59923a438bbd91e34d105186db0ed
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae