{"uid":"cap_aIcWQJXgSiCKPGTe9bqHh","slug":"zeroclick-x402-service-registry-fact-check-ad3f3366","name":"Fact Check","description":"Verify factual claims using a second AI model via OpenRouter. Submit a claim and optionally provide context — returns a structured verdict (true/false/uncertain) with confidence score, reasoning, and corrections if the claim is false. Useful for cross-referencing your primary model's outputs against a different model. Default model: Gemini 2.5 Flash (fast and cheap). Use a stronger model for complex claims.","url":"https://factcheck.withzero.ai/run?utm_source=zero.xyz","method":"POST","headers":{"X-ZAM-Access-Key":"zeroclick"},"bodySchema":{"type":"object","required":["claim"],"properties":{"claim":{"type":"string","maxLength":5000,"minLength":1,"description":"The factual claim to verify (e.g. \"The Eiffel Tower is 330 meters tall\")"},"model":{"type":"string","description":"Model to use for fact-checking (default: google/gemini-2.5-flash). Available: openai/gpt-4.1-mini, google/gemini-2.5-flash, meta-llama/llama-3.3-70b-instruct, deepseek/deepseek-v3, mistralai/mistral-small"},"context":{"type":"string","maxLength":5000,"description":"Optional context or source material the claim is derived from"}},"additionalProperties":false},"responseSchema":{"type":"object","required":["claim","verdict","confidence","reasoning","corrections","model","latencyMs"],"properties":{"claim":{"type":"string","description":"The original claim that was checked"},"model":{"type":"string","description":"Model used for fact-checking"},"verdict":{"enum":["true","false","uncertain"],"type":"string","description":"Fact-check verdict"},"latencyMs":{"type":"number","description":"Response time in milliseconds"},"reasoning":{"type":"string","description":"Brief explanation of the verdict"},"confidence":{"type":"number","description":"Confidence level 0-100"},"corrections":{"type":"string","nullable":true,"description":"Correct information if claim is false, null otherwise"}},"additionalProperties":false},"example":{"request":{"claim":"Water boils at 100 degrees Celsius at sea level"},"response":{"claim":"Water boils at 100 degrees Celsius at sea level","model":"google/gemini-2.5-flash","verdict":"true","latencyMs":775,"reasoning":"The boiling point of water at standard atmospheric pressure (which is approximately at sea level) is indeed 100 degrees Celsius (212 degrees Fahrenheit). This is a fundamental scientific constant.","confidence":100,"corrections":null}},"exampleRequest":{"claim":"Water boils at 100 degrees Celsius at sea level"},"tags":["ai","fact-check","verify","llm","accuracy"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_90offKNL-_vVSzhLXCN6D","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x20C000000000000000000000b9537d11c60E8b50","unit":"request","depositMicros":null,"planRef":"fact-check:1"}],"brandName":"ZeroClick x402 Service Registry","brandSlug":"zeroclick-x402-service-registry","brandBaseUrl":"https://withzero.ai","brandDocsUrl":null,"whatItDoes":"Verify a factual claim using a second AI model via OpenRouter, returning a structured verdict (true/false/uncertain) with confidence score, reasoning, and corrections.","exampleAgentPrompt":"Can you fact-check this claim for me — 'The Eiffel Tower is 330 meters tall' — and tell me if it's true or false, how confident you are, and what the correct figure is if it's wrong? Use GPT-4.1-mini for this one.","exampleUseCases":null,"resultDescription":"Returns a structured object with the original claim, the verdict (true/false/uncertain), a confidence score from 0–100, a brief reasoning explanation, corrections if the claim is false (null otherwise), the model used, and response latency in milliseconds.","failureModes":["Claim text is empty or missing — returns 400 validation error","Claim or context exceeds 5000 characters — returns 400 error","Invalid model name specified — may fallback or return 400","Upstream OpenRouter/model timeout — returns 5xx error","Ambiguous claim with low-confidence result — verdict may be 'uncertain' with low confidence score"],"whenToPreferThis":"Use this endpoint when you need to cross-validate AI-generated content or user-supplied claims against a second independent model without building your own fact-checking pipeline. Especially useful when your primary model might hallucinate and you want a cheap, structured verdict with reasoning. Prefer a stronger model (e.g. GPT-4.1-mini or DeepSeek V3) for nuanced or complex claims; use the default Gemini 2.5 Flash for speed and cost efficiency.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T04:29:45.833Z","isFirstParty":true,"canonicalSlug":"zeroclick-x402-service-registry-fact-check-ad3f3366"}