{"uid":"cap_qCFVH110iidhvgfMT7kAz","slug":"factstamp-watch-single-citation-or-package-version-re-check-f6815061","name":"FactStamp Watch — Single Citation or Package Version Re-Check Subscription","description":"Buy a standing re-check of one citation or one package version, when an answer has to stay true rather than be true once: re-checked every day for 30 days. US$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. Pay per call here, or redeem a prepaid pack code (10 credits). Returns a read URL and a token shown once.","url":"https://factstamp.agentrails.workers.dev/watch?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input","output"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"body":{"type":"object"},"type":{"const":"http"},"method":{"const":"POST"},"bodyType":{"const":"application/json"}},"additionalProperties":true},"output":{"type":"object","required":["type","example"],"properties":{"type":{"const":"json"},"example":{"type":"object"}},"additionalProperties":true}},"additionalProperties":false},"responseSchema":{"type":"json","example":{"kind":"citation","token":"fw_9d1c… (shown once)","subject":"10.1038/nature12373","read_url":"https://factstamp.agentrails.workers.dev/watch/9f2c1ab4d0e57718","watch_id":"9f2c1ab4d0e57718","paid_with":{"rail":"x402_pay_per_call","settlement":{"success":true},"list_price_usd":0.5},"expires_at":"2026-11-05T06:30:00.000Z","receipt_url":"https://factstamp.agentrails.workers.dev/r/8bd1f0a4c9e27715","next_check_at":"2026-10-07T06:30:00.000Z","seeded_verdict":"verified"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.5","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.5/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.5","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.5","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Ma9jQBJSnIPD9dNFJzH44","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.5","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Sets up a 30-day daily monitoring watch on a single citation (DOI/arXiv) or package version, returning a signed initial verdict and a read URL; each real change (retraction, advisory, yanked version) generates its own signed receipt.","exampleAgentPrompt":"Set up a 30-day daily watch on the paper with DOI 10.1038/nature12373 so I get a signed receipt immediately and again any time it gets retracted or corrected.","exampleUseCases":[{"title":"Ongoing citation integrity for a published report","prompt":"I'm about to publish a report citing DOI 10.1126/science.abe8070 — can you set up a 30-day daily watch on it so we get a signed alert the moment it's retracted or corrected?"},{"title":"Dependency monitoring before a production release","prompt":"We're shipping next week and I need daily checks on the numpy 1.26.4 PyPI package for the next 30 days — set up a watch and give me a signed receipt right now confirming its current status."},{"title":"Academic due diligence for a grant proposal","prompt":"We're referencing arXiv:2310.06825 in our grant proposal — please start a daily watch on it for 30 days so any retraction or correction triggers a signed receipt we can keep on file."}],"resultDescription":"Returns a JSON object with a watch_id, a read_url for polling future status, a one-time token for authenticated access, the seeded_verdict of the citation or package at purchase time, a receipt_url, the next_check_at timestamp, and an expires_at timestamp 30 days out. Each real change during the watch period generates its own signed receipt accessible via the read_url.","failureModes":["Invalid or unresolvable DOI/arXiv ID returns an error before creating a watch","Payment failure (insufficient USDC or bad prepaid pack code) prevents watch creation","Subject type not supported returns a schema validation error","Duplicate watch on same subject within active period may return conflict or existing watch","Network or worker timeout may require retry without double-billing if idempotency key is not supplied"],"whenToPreferThis":"Choose this endpoint when you need continuous, day-by-day assurance that a single citation or package version remains valid over a 30-day window — not just a one-time check. It is ideal when the answer must stay true (e.g., a paper cited in a published report, a dependency locked in a production manifest) and you need a signed, auditable trail of any status changes. Use the batch /watch-list endpoint instead when monitoring more than one subject at once.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-16T06:40:50.290Z","isFirstParty":false,"canonicalSlug":"factstamp-watch-single-citation-or-package-version-re-check-f6815061"}