{"uid":"cap_mnwy0zAsM_qm27O4Co7F8","slug":"klymax402-fact-checker-api-219eea7f","name":"klymax402 Fact Checker API","description":"One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.","url":"https://klymax402.com/api/fact-checker/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_Zn2NM-o3x4VtJ3hDynmCN","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 against multiple sources and returns a fact-check result with supporting evidence","exampleAgentPrompt":"Can you fact-check the claim 'The Eiffel Tower is 330 meters tall' and give me up to 5 sources that confirm or deny it?","exampleUseCases":[{"title":"Verifying viral social media claim","prompt":"I saw someone post that 'The Great Wall of China is visible from space' — can you fact-check that claim and show me up to 8 sources?"},{"title":"Research accuracy check","prompt":"Before I publish my report, can you verify whether 'Humans share 98.7% of their DNA with chimpanzees' is accurate, and give me sources to back it up?"},{"title":"News headline validation","prompt":"Can you check whether the claim 'Electric vehicles produce more CO2 than gasoline cars over their lifetime' is true or false, with up to 10 sources?"}],"resultDescription":"Returns a fact-check verdict indicating whether the claim is true, false, or unverified, along with a list of supporting or contradicting sources (up to the requested maximum), potentially including source URLs, credibility signals, and a confidence assessment.","failureModes":["Claim is too vague or ambiguous to verify — endpoint may return low confidence or no verdict","No reliable sources found for niche or obscure claims — returns empty source list","Payment failure via x402 protocol — 402 response if USDC payment not completed","Rate limiting if too many requests are made in a short period","max_sources exceeds 10 — likely clamped or returns an error"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to programmatically verify a specific factual claim with cited sources, especially in research, journalism, or content moderation workflows. It is particularly useful when you need a structured fact-check response rather than a raw web search, and when paying per-call without managing API keys is preferable. Use this over general web search when you specifically need a verdict (true/false/unverified) rather than raw search results.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:03:57.039Z","isFirstParty":false}