{"uid":"cap_PxAWskjAPvZnyrY24VjPL","slug":"factstamp-citation-entity-verification-917f23ea","name":"FactStamp Citation & Entity Verification","description":"Figure, entity, citation and dependency verification for other agents. Cited to dated primary sources. Unknown is valid.","url":"https://factstamp.agentrails.workers.dev/citation?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":"doi","query":"10.1038/nature12373","record":{"doi":"10.1038/nature12373","type":"journal-article","year":2013,"title":"Nanometre-scale thermometry in a living cell","authors":["G. Kucsko","P. C. Maurer","N. Y. Yao"],"container":"Nature","publisher":"Springer Science and Business Media LLC","retraction":null},"sources":[{"name":"Crossref","http_status":200}],"verdict":"verified"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_dnhpvVWW8LYY2m3Vy1Yh8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies figures, entities, citations, and dependencies against dated primary sources, returning a verified/unverified verdict with source metadata","exampleAgentPrompt":"Can you verify that DOI 10.1038/nature12373 is a real, non-retracted journal article and tell me its title, authors, and publication year?","exampleUseCases":[{"title":"Fact-checking AI-generated research summaries","prompt":"I have a research summary an AI wrote that cites DOI 10.1126/science.abc1234 — can you verify that citation actually exists, isn't retracted, and give me the real title and authors?"},{"title":"Pre-publication reference audit","prompt":"Before I submit my report, can you check if the citation 10.1016/j.cell.2021.01.001 is valid, who published it, and whether it's been retracted?"},{"title":"Agent pipeline citation grounding","prompt":"My agent just cited a Nature paper with DOI 10.1038/s41586-020-2649-2 as a source — verify it's a legitimate primary source and tell me the year and journal it appeared in."}],"resultDescription":"A JSON object containing the query kind (e.g. doi), the queried identifier, a record with structured bibliographic metadata (title, authors, year, journal, publisher, retraction status), a list of sources consulted with HTTP status, and an overall verdict of 'verified' or similar.","failureModes":["DOI or identifier not found in any source — returns unverified verdict","Source APIs (e.g. Crossref) return non-200 status — partial or failed lookup","Malformed or unsupported citation format — may return error or unknown verdict","Retracted paper — returned as verified but with retraction metadata populated","Payment not fulfilled — x402 payment required response before processing"],"whenToPreferThis":"Use FactStamp when you need authoritative, source-cited verification of academic DOIs, entities, or factual claims with a clear verdicts and retraction checks — especially in agentic pipelines where hallucinated citations need to be caught before output is delivered. Prefer it over general web search when you need structured bibliographic metadata and primary-source grounding rather than a scraped or synthesized answer.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T02:35:25.832Z","isFirstParty":false,"canonicalSlug":"factstamp-citation-entity-verification-917f23ea"}