{"uid":"cap_IcxM1Fsq_3D0CjWc9VUKF","slug":"factstamp-document-fact-check-b2b6a3ac","name":"FactStamp Document Fact-Check","description":"Call it before you send, file or publish a document that quotes figures, names companies or cites papers. Post the text and every checkable claim comes back verified against dated primary sources, as one signed bundle with a per-claim receipt and its licence. Claims we cannot answer are named and never charged, and the preview is free. Verdicts: verified, stale, contradicted, unknown.","url":"https://factstamp.agentrails.workers.dev/document?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":{"claims":[{"kind":"figure","as_of":"2026-08-01","claim":"The RBA cash rate was 4.35% as at August 2026","source":"Reserve Bank of Australia","verdict":"contradicted"},{"kind":"entity","as_of":"2026-10-06","claim":"Shopify Inc. is registered in Canada","source":"GLEIF","verdict":"verified"}],"receipt":"eyJhbGciOiJFZERTQSJ9…","unknown":1,"answered":2,"claims_found":3,"charged_credits":2,"document_sha256":"9f2c…"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.25","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":"$0.25/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Pmfkp9W1CXxhRbKl-qI4b","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.25","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies all checkable claims in a submitted document against dated primary sources, returning per-claim verdicts and a signed bundle with receipts.","exampleAgentPrompt":"Before I publish this quarterly report, can you run it through FactStamp to verify every figure, company name, and cited paper — I need back a signed bundle with a per-claim verdict and receipt so I know exactly what's confirmed, what's stale, and what couldn't be answered?","exampleUseCases":[{"title":"Press release fact-check before distribution","prompt":"I'm about to send out this press release — it mentions Shopify's registration country, the RBA cash rate, and a few market-share figures. Can you run the whole thing through FactStamp and tell me which claims are verified, which are contradicted or stale, and which ones it couldn't answer?"},{"title":"Academic paper audit before journal submission","prompt":"Before I submit this paper, can you fact-check every statistic, named company, and data point in it using FactStamp and give me a signed receipt bundle so I can show the editor each claim was checked against a primary source?"},{"title":"Contract due-diligence entity and figure check","prompt":"We're about to sign this supplier contract — it names three companies and quotes some regulatory figures. Can you run the document through FactStamp so we get a per-claim verdict on whether each entity is currently registered and each figure is current, along with the signed bundle?"}],"resultDescription":"Returns a JSON object containing an array of claims with their kind (figure, entity, etc.), as-of date, source, and verdict (verified, stale, contradicted, or unknown); a signed EdDSA receipt bundle; counts of claims found, answered, unknown, and charged; and a SHA-256 hash of the submitted document. Unknown claims are named but not charged.","failureModes":["Document text missing or malformed — returns 400 error","Payment not attached or insufficient — returns 402 requiring x402 payment","Primary sources temporarily unreachable — affected claims returned as unknown (not charged)","Document too large — may be rejected or truncated","No checkable claims found — returns empty claims array with zero charged credits"],"whenToPreferThis":"Choose this endpoint when you need to fact-check an entire document in a single round trip rather than checking individual claims one at a time. It is ideal before publishing, filing, or distributing any document that contains figures, named companies, or cited papers, and when you need a cryptographically signed bundle as an audit trail. Prefer this over per-claim or per-entity endpoints when the document contains mixed claim types (figures, entities, citations) and you want consolidated verification with a single signed receipt.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T00:35:46.462Z","isFirstParty":false,"canonicalSlug":"factstamp-document-fact-check-b2b6a3ac"}