{"slug":"x402-agentindex-world-fact-check-864b8f","title":"Check a claim against live web sources","host":"x402.agentindex.world","method":"POST","resource":"https://x402.agentindex.world/fact-check","category":"search","description":"Check a claim against live web sources - a verdict, a confidence level, and the sources that support or contradict it, each with its URL and stance. Returns 'inconclusive' rather than a guess when the sources don't clearly settle it. Try GET /fact-check/sample. Part of the AgentIndex content kit (pd","price_listed":0.01,"price_asked":0.01,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":902,"reported_calls_30d":0,"reported_payers_30d":0,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"claim":"The Eiffel Tower is taller than the Statue of Liberty."},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"claim":{"description":"The factual claim to check against live web sources.","type":"string"}},"required":["claim"]},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"claim":{"type":"string"},"confidence":{"description":"0.0-1.0 confidence in the verdict.","type":"number"},"sources":{"items":{"properties":{"stance":{"enum":["supports","contradicts","neutral"],"type":"string"},"title":{"description":"Source page title, when known."},"url":{"type":"string"}},"type":"object"},"type":"array"},"verdict":{"description":"'inconclusive' is returned instead of a guess whenever confidence is low or no source clearly supports/contradicts the claim - never a confident-sounding verdict the sources don't actually back up.","enum":["supported","contradicted","mixed","unverifiable","inconclusive"],"type":"string"},"x402_receipt":{"description":"Billing and provenance receipt for this call.","type":"object"}},"required":["claim","verdict","confidence","sources"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-10","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.01,"price_match":true,"latency_ms":902,"error":null}],"description_full":"Check a claim against live web sources - a verdict, a confidence level, and the sources that support or contradict it, each with its URL and stance. Returns 'inconclusive' rather than a guess when the sources don't clearly settle it. Try GET /fact-check/sample. Part of the AgentIndex content kit (pdf, web-read, extract, summarize, detect-language) - see GET /capabilities.","last_updated":"2026-10-10T16:59:34.052Z","schemes":["exact"]}