{"uid":"cap_1moPKZeAD1xgWfNxGM9TJ","slug":"factstamp-document-fact-check-78a5f435","name":"Factstamp Document Fact-Check","description":"For 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. Prose, not a list: a bare bibliography belongs to /bulk.","url":"https://agents.factstamp.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":null,"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_jdyp6ALPq6H3aIsKcZedE","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 every checkable claim in a prose document against dated primary sources, returning a signed bundle with per-claim verdicts and licence receipts.","exampleAgentPrompt":"Fact-check this report for me — it quotes GDP figures, names several biotech companies, and cites a few academic papers. I need a signed verification bundle with a verdict and receipt for each claim, and I want to know which claims came back verified, stale, contradicted, or unknown.","exampleUseCases":[{"title":"Pre-publication article fact-check","prompt":"Before we publish this investigative piece, fact-check it against primary sources — it cites unemployment figures from the BLS, names three pharmaceutical companies, and references a 2022 Nature paper. Give me a verdict for each claim and flag anything that's stale or contradicted."},{"title":"Investor report accuracy review","prompt":"Our investment memo references market size statistics, revenue figures for four companies, and a McKinsey study. Can you verify all those claims against their original sources and send back a signed bundle I can attach to the filing?"},{"title":"Academic whitepaper verification","prompt":"I need to verify all the checkable facts in this whitepaper before submission — it cites inflation data, references WHO statistics, and names several biotech firms. I want a per-claim receipt showing what's verified, what's stale, and what you couldn't confirm."}],"resultDescription":"A signed verification bundle covering every checkable claim in the submitted document. Each claim receives a verdict (verified, stale, contradicted, or unknown), a dated primary-source citation, a licence for use, and a per-claim receipt. Claims that cannot be answered are named explicitly and not charged. The response is returned as structured prose rather than a bare list.","failureModes":["Document text missing or malformed — 400 error indicating required body","No checkable claims detected in the document — returns empty or unknown verdicts","Primary source unavailable or unreachable — claim marked 'unknown' and not charged","Payment not provided or insufficient — 402 Payment Required before processing","Rate limiting or server overload — 429 or 503 response","Document too large for single-call processing — may require chunking or /bulk endpoint"],"whenToPreferThis":"Use this endpoint when you have a full prose document containing multiple heterogeneous claims — figures, company names, citations — and need a holistic, signed verification bundle with per-claim receipts in a single call. Prefer this over the /bulk endpoint when your content is narrative prose rather than a bibliography or dependency manifest. Choose this over the single-stat or single-citation endpoints when you need comprehensive coverage of an entire document rather than targeted checks on individual claims.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:19:49.154Z","isFirstParty":false,"canonicalSlug":"factstamp-document-fact-check-78a5f435"}