{"uid":"cap_wXaceTQez-JZ_D8S-dIK5","slug":"factstamp-watch-single-citation-or-package-version-monitor-8a4debc7","name":"Factstamp Watch — Single Citation or Package Version Monitor","description":"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$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. One subject only: for a list use /watch/portfolio. Pay per call here, or redeem a pack code (10 credits).","url":"https://agents.factstamp.dev/watch?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$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":null,"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_oVk_N384AQsRhePmy2R2C","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":"Registers a single citation (DOI/arXiv) or package version for daily re-checks over 30 days, returning a signed receipt on purchase and a new signed receipt whenever a real change (retraction, advisory, yanked version) is detected.","exampleAgentPrompt":"Watch the paper with DOI 10.1016/j.cell.2023.01.001 every day for the next 30 days and send me a signed alert if it gets retracted or corrected.","exampleUseCases":[{"title":"Retraction watch for cited paper","prompt":"I just submitted a report citing DOI 10.1038/s41586-023-06474-3 — can you monitor it daily for the next 30 days and alert me the moment it gets retracted, corrected, or flagged?"},{"title":"Security advisory watch for npm package","prompt":"We're shipping with lodash@4.17.21 — please set up a 30-day daily watch on that package version and notify me if any security advisory or yank appears."},{"title":"Ongoing integrity check for arXiv preprint","prompt":"I'm basing a product decision on arXiv:2310.06825 — keep checking it every day for a month and flag me immediately if its status changes or a retraction notice appears."}],"resultDescription":"On purchase the endpoint returns a signed receipt confirming the first check result for the subject. For each subsequent day over 30 days, if a real change is detected (retraction, correction, security advisory, yanked package version), the agent receives a new signed receipt documenting that change. No change means no additional receipt for that day. The signed receipts include a timestamp, the subject identifier, and the nature of the detected change.","failureModes":["Subject identifier not recognized (invalid DOI, arXiv ID, or package name) — returns error indicating unresolvable subject","Subject already being watched under the same account — may return conflict or duplicate warning","Payment not received or insufficient USDC — 402 payment required response","Attempting to watch multiple subjects in one call — should use /watch/portfolio instead","Pack code invalid or already redeemed — authentication/credit error"],"whenToPreferThis":"Use this endpoint when you need continuous, daily integrity monitoring of a single citation or package version over a 30-day period — not just a one-time check. Prefer this over a single-lookup endpoint (like /check or /retraction) when the subject must remain trustworthy for weeks, not just at a point in time. Choose /watch/portfolio instead if you have a list of subjects. Ideal when an agent or workflow needs auditable, signed proof of each detected change throughout the monitoring window.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:19:05.568Z","isFirstParty":false,"canonicalSlug":"factstamp-watch-single-citation-or-package-version-monitor-8a4debc7"}