Evidence row 1854

Observed 26 Oct 2026, 14:34 UTC, by baseline/1.

Kind: listing
About: source_record agentic_market:chess402-vercel-app
Recorded: 26 Oct 2026, 14:34 UTC
Previous row: None: the first of its kind about this subject
Body SHA-256: 4aea6b935aadbf7365173046f5d97b79c91ebd3950795d71b25b3440f17ea68a
Leaf: 0x3a4fecdc6ac49ed2aecd3a818240ec456b9e1dae41cf20f0454d9f6e9e745c04

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://chess402.vercel.app/api/cloud-eval"
    ],
    [
      "x402",
      "https://chess402.vercel.app/api/masters"
    ],
    [
      "x402",
      "https://chess402.vercel.app/api/puzzle/daily"
    ],
    [
      "x402",
      "https://chess402.vercel.app/api/user"
    ]
  ],
  "name": "chess402.vercel.app",
  "owner_address": null,
  "raw": {
    "caip2_networks": [
      "eip155:8453"
    ],
    "category": "",
    "description": "",
    "domain": "chess402.vercel.app",
    "endpoints": [
      {
        "description": "Stockfish cloud evaluation for a FEN position. Returns depth, evaluation, and principal variation(s) when Lichess has the position cached.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
            "group": "body",
            "name": "fen",
            "required": false,
            "type": "string"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 1,
            "group": "body",
            "name": "multiPv",
            "required": false,
            "type": "number"
          }
        ],
        "pricing": {
          "amount": "0.005",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "4",
          "l30DaysUniquePayers": "3"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/cloud-eval"
      },
      {
        "description": "Masters opening explorer for a position. Returns top moves, win/draw/loss rates, and recent top master games from the Lichess masters database.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
            "group": "body",
            "name": "fen",
            "required": false,
            "type": "string"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 12,
            "group": "body",
            "name": "moves",
            "required": false,
            "type": "number"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "e2e4,e7e5",
            "group": "body",
            "name": "play",
            "required": false,
            "type": "string"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 4,
            "group": "body",
            "name": "topGames",
            "required": false,
            "type": "number"
          }
        ],
        "pricing": {
          "amount": "0.003",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "4",
          "l30DaysUniquePayers": "4"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/masters"
      },
      {
        "description": "Today's Lichess daily puzzle: source game, themes, initial position, solution moves, and rating.",
        "method": "POST",
        "parameters": [],
        "pricing": {
          "amount": "0.001",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "7",
          "l30DaysUniquePayers": "6"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/puzzle/daily"
      },
      {
        "description": "Lichess user profile snapshot: ratings per perf, country, title, online status, counts.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "DrNykterstein",
            "group": "body",
            "name": "username",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.001",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "7",
          "l30DaysUniquePayers": "4"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/user"
      }
    ],
    "enriched": false,
    "iconUrl": "",
    "id": "chess402-vercel-app",
    "integrationType": "",
    "isNew": false,
    "name": "chess402.vercel.app",
    "networks": [
      "Base"
    ],
    "priceSummary": {
      "avgCostBasis": "exact",
      "avgCostPerTransaction": "0.0025",
      "currency": "USDC",
      "maxAmount": "0.005",
      "minAmount": "0.001"
    },
    "provider": "chess402.vercel.app",
    "providerUrl": "",
    "serviceName": "",
    "tags": []
  },
  "source": "agentic_market",
  "summary": ""
}

What the leaf hashes

{"body":"4aea6b935aadbf7365173046f5d97b79c91ebd3950795d71b25b3440f17ea68a","id":1854,"kind":"listing","method":"baseline/1","observed_us":1793025259449921,"prev":null,"subject":"agentic_market:chess402-vercel-app","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).
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Day root: 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained: 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published: On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON