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Guest listing — FactStamp. A standing re-check of ONE citation or package version, for an answer that must stay true for a month rather than once: daily re-checks for 30 days. US$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. One subject only: for a list use /watch/portfolio. Pay per call here, or redeem a pack code (10 credits).

POST https://agents.factstamp.dev/watch

0.5 USDC on Base · payTo 0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32

Status: verified · payable

Settlement: direct to the seller's payTo — 0% HIVE402 take

Payment routes

{
  "expires_at": "2026-11-05T06:30:00.000Z",
  "kind": "citation",
  "next_check_at": "2026-10-07T06:30:00.000Z",
  "paid_with": {
    "list_price_usd": 0.5,
    "rail": "x402_pay_per_call",
    "settlement": {
      "success": true
    }
  },
  "read_url": "https://factstamp.agentrails.workers.dev/watch/9f2c1ab4d0e57718",
  "receipt_url": "https://factstamp.agentrails.workers.dev/r/8bd1f0a4c9e27715",
  "seeded_verdict": "verified",
  "subject": "10.1038/nature12373",
  "token": "fw_9d1c… (shown once)",
  "watch_id": "9f2c1ab4d0e57718"
}