{"uid":"cap_yM87L8bE_236OV9mcbarl","slug":"the-stall-fact-check-x402-9866fecd","name":"The Stall — Fact Check (x402)","description":"Domain-agnostic x402 capability chassis by IntuiTek¹. 300 AI-callable data services — pay USDC on Base mainnet. No accounts or API keys required.","url":"https://the-stall.intuitek.ai/cap/fact-check","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["claim"],"properties":{"claim":{"type":"string","description":"The factual statement to verify (e.g. 'The Eiffel Tower is 330 meters tall' or 'Apple was founded in 1976')."}},"additionalProperties":false}},"additionalProperties":false}}},"responseSchema":null,"example":{"request":{"input":{"type":"http","method":"GET","queryParams":{"claim":"The Earth orbits around the Sun","context":"Basic astronomy and planetary motion"}}},"response":{"claim":"The Earth orbits around the Sun","caveats":"The evidence gathered mainly consists of discussions or opinions rather than directly confirming or denying the claim, which is well-established in the field of astronomy.","verdict":"confirmed","reasoning":"The scientific consensus is that the Earth orbits around the Sun as part of the heliocentric model of our solar system. No evidence was found that contradicts this fundamental aspect of astronomy, and while some discussions may address nuances in the dynamics of orbital mechanics, they do not undermine the validity of the claim.","timestamp":"2026-06-12T05:12:38.038Z","confidence":0.95,"key_entities":["Earth","Sun"],"sources_queried":4,"sources_responded":2,"supporting_evidence":[],"contradicting_evidence":[]}},"exampleRequest":{"claim":"The Earth orbits around the Sun","context":"Basic astronomy and planetary motion"},"tags":["x402"],"displayCostAmount":"0.1","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.47","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.47","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_z4Xqm0N3KGsfpGOpJkNZf","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.47","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 and returns a verdict (true/false/uncertain) with supporting reasoning, paid per-call in USDC via x402.","exampleAgentPrompt":"Can you fact-check this claim for me: 'The Eiffel Tower was built in 1889 as a permanent structure' — use the fact-check service and include any relevant historical context about its original purpose?","exampleUseCases":null,"resultDescription":"A verdict on whether the submitted claim is true, false, or uncertain, along with a confidence signal and reasoning that supports the assessment.","failureModes":["Vague or ambiguous claims may return uncertain verdicts rather than definitive true/false","Payment failure or insufficient USDC balance blocks the request","Claims requiring real-time or proprietary data may not be verifiable","Extremely niche or obscure claims may return low-confidence results","Missing required 'claim' query parameter returns a validation error"],"whenToPreferThis":"Use this endpoint when an AI agent needs to verify a discrete factual assertion without registering an account or obtaining an API key — particularly useful in automated pipelines where pay-per-call USDC billing (x402) is preferred over subscription models. Best for single, specific claims rather than broad research tasks.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:48:18.234Z","isFirstParty":false}