{"uid":"cap_bBVrHKuI0qL6AM-y-OiS5","slug":"crucible-fact-check-f9d8a64a","name":"Crucible Fact-Check","description":"Pay-per-call Web3 agent services: wallet, token and agent security audits; token prices, depeg checks and portfolio valuation; cited fact-checking and source research.","url":"https://crucible.unitynodes.com/research/fact-check","method":"POST","headers":{},"bodySchema":{"type":"object","required":["claim"],"properties":{"claim":{"type":"string","description":"Claim to fact-check"}}},"responseSchema":{"type":"object","properties":{"cost":{"type":"number"},"data":{"type":"object","properties":{"claim":{"type":"string"},"verdict":{"type":"string"},"citations":{"type":"array","items":{"type":"object","properties":{"url":{"type":"string"},"title":{"type":"string"}}}}}},"sources":{"type":"array","items":{"type":"object","properties":{"url":{"type":"string"},"hash":{"type":"string"},"name":{"type":"string"}}}},"evidence":{"type":"array","items":{"type":"object","properties":{"claim":{"type":"string"},"support":{"type":"string"},"sourceIndex":{"type":"number"}}}},"riskScore":{"type":"number"},"confidence":{"type":"number"},"contentHash":{"type":"string"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_sXnMMDosvPOpKHBIAPQ_B","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies a text claim against online sources and returns a verdict with citations, evidence, confidence score, and risk score.","exampleAgentPrompt":"Can you fact-check this claim for me: 'Ethereum completed its Merge transition to proof-of-stake in September 2022' — I need a verdict, cited sources, and a confidence score.","exampleUseCases":[{"title":"Verify crypto project claim","prompt":"Fact-check this for me: 'Solana has never gone offline for more than 24 hours' — give me a verdict and the sources you used."},{"title":"Check DeFi news accuracy","prompt":"I just saw a headline saying 'USDC depegged to $0.87 in March 2023' — is that accurate? Give me citations proving or disproving it."},{"title":"Research blockchain statistic","prompt":"Can you verify the claim that 'Bitcoin has a fixed maximum supply of 21 million coins' and show me the evidence with cited sources?"}],"resultDescription":"Returns a verdict string (e.g. true/false/unverified) for the submitted claim, an array of citation objects (URL + title), an evidence array showing which parts of the claim are supported and by which source, a numeric confidence score (0–1), a risk score, a content hash for auditability, and the cost of the call.","failureModes":["Claim is too vague or ambiguous to verify — low confidence score returned","No reliable sources found for the claim — verdict may be 'unverified'","External web sources unavailable or rate-limited — incomplete citations","Claim contains highly niche or very recent information not yet indexed — low evidence coverage","Payment not processed (x402 flow failure) — 402 response returned before result"],"whenToPreferThis":"Choose this endpoint when you need a cited, evidence-backed verdict on a specific factual claim — especially for Web3, crypto, or blockchain topics — and require auditability via a content hash. Prefer it over general search when you need structured evidence objects and confidence scoring rather than raw search results.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:36:10.756Z","isFirstParty":false}