{
  "catalog": "ledatic-attested-data",
  "updated": "2026-07-02",
  "verify_note": "Every listing's provenance chain is independently re-verifiable; see each dataset page.",
  "datasets": [
    {
      "name": "Rail Verified-Pairs Corpus v2",
      "slug": "rail-verified-pairs-v2",
      "price_usd": 199,
      "url": "https://ledatic.org/data/rail-verified-pairs-v2",
      "buy_url": "https://buy.stripe.com/6oU28j5cBbsDaoC3lN0Fi03",
      "records": "52,243 pairs",
      "size": "4.4 MB (JSONL)",
      "format": "application/jsonl",
      "sha256": "1a6941afad3ad6259af6a0a48f0554108ba0b3197e8e05e53e487833a6cd046c",
      "witness_pulse": 2641877,
      "provenance_basis": "operated-substrate (synthetic, machine-verified)",
      "license": "single-organization commercial",
      "x402": {
        "endpoint": "https://ledatic.org/x402/rail-verified-pairs-v2",
        "network": "base",
        "asset": "USDC",
        "maxAmountRequired": "199000000",
        "payTo": "0x0129b9e66C449b4c7027F07A7b8811BBf6fb3301",
        "attestation": "ed25519",
        "content_sha256": "1a6941afad3ad6259af6a0a48f0554108ba0b3197e8e05e53e487833a6cd046c",
        "witness_pulse": 2641877,
        "download_sha256": "cebed0a4072df5116812b024e7818aeb3eaa1a5334b7882c3c8e59dd7a967fff"
      }
    },
    {
      "name": "Attested Text Corpus v2",
      "slug": "attested-text-corpus-v2",
      "price_usd": 499,
      "url": "https://ledatic.org/data/attested-text-corpus-v2",
      "buy_url": "https://buy.stripe.com/fZudR17kJ54f1S64pR0Fi04",
      "records": "25,541 documents / ~1.54B tokens",
      "size": "2.45 GB (gzip)",
      "format": "application/gzip",
      "sha256": "92e9af57335910a57e5f50d33564aa07542d6406cb0cde010f0e3c139f2e9e63",
      "witness_pulse": 2516402,
      "provenance_basis": "per-document: pre-1929 PD / source-cleared / operated-substrate",
      "license": "single-organization commercial",
      "x402": {
        "endpoint": "https://ledatic.org/x402/attested-text-corpus-v2",
        "network": "base",
        "asset": "USDC",
        "maxAmountRequired": "499000000",
        "payTo": "0x0129b9e66C449b4c7027F07A7b8811BBf6fb3301",
        "attestation": "ed25519",
        "content_sha256": "92e9af57335910a57e5f50d33564aa07542d6406cb0cde010f0e3c139f2e9e63",
        "witness_pulse": 2516402
      }
    }
  ],
  "payment_rails": {
    "human": "stripe \u2014 see each dataset's buy_url",
    "agent": "x402 \u2014 see each dataset's x402.endpoint (per-request USDC, response is Ed25519-signed and verifiable against download_sha256 / content_sha256)"
  },
  "agents_note": "Machine buyers: GET this catalog, pick a dataset, pay its x402.endpoint (HTTP 402 -> stablecoin), receive the file + an Ed25519 attestation header. Verify the download against download_sha256 and the content against content_sha256. No account, no API key."
}