{"uid":"cap_O8BrEZfVcY-t1knCvdSeY","slug":"fact-checker-api-klymax402-a34c4452","name":"Fact-Checker API (klymax402)","description":"Fact-check a claim by searching for evidence online","url":"https://fact-checker.api.klymax402.com/api/check","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"claim":{"type":"string","description":"The factual claim to verify (e.g., 'The Eiffel Tower is 330 meters tall')"},"max_sources":{"type":"number","description":"Maximum number of sources to return (default: 5, max: 10)"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.012","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":"$0.012/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_D60wSPD61-n9frGEJeYXX","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.012","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies a factual claim by searching for evidence online and returning sourced results","exampleAgentPrompt":"Can you fact-check this claim for me: 'The Eiffel Tower is 330 meters tall' — and pull up to 8 sources so I can see the evidence?","exampleUseCases":null,"resultDescription":"Returns a verification assessment of the submitted claim along with up to the requested number of online sources that provide evidence either supporting or contradicting the claim.","failureModes":["Claim string is empty or missing — likely returns 400 or validation error","max_sources exceeds 10 — may be capped or return an error","Claim is too ambiguous or unverifiable — may return low-confidence or no sources","Network/search backend unavailable — may return 500 or timeout","Claim is in a language other than English — may produce incomplete results"],"whenToPreferThis":"Use this endpoint when you need to verify a specific factual claim against real online evidence and want sourced results. Prefer this over general web search when you want a structured fact-check response rather than raw search results, and when the query is a concrete verifiable assertion rather than an open-ended question.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:32:56.709Z","isFirstParty":false}