{"uid":"cap_BTzKGy8jRo6yXcLW7Ziyw","slug":"script-master-labs-x402-fact-check-api-e50e83c4","name":"Script Master Labs x402 Fact Check API","description":"Pay-per-call crypto, RWA, federal, SEC, Section 8/HUD housing, and compliance APIs via x402. Primary: USDC on Base (eip155:8453). Also accepts Global Dollar (USDG) on Robinhood Chain (eip155:4663) via sovereign X-PAYMENT-TX. Hyphen routes only (e.g. /x402/gas-tracker, /x402/pha-lookup, /x402/sec-8k). MARKETPLACE REVIEW: use free /x402/playground/* (no key, no payment). Production /x402/* returns 402 unless paid via x402 or X-Api-Market-Key / X-API-Key from seller dashboard.","url":"https://mcp-x402.onrender.com/x402/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":{"type":"string"},"queryParams":{"type":"object","required":["claim"],"properties":{"claim":{"type":"string","description":"The claim or statement to fact-check (required, max 300 chars)."},"domain":{"enum":["grants","contracts","drug","provider","insider","yields","clinical","general"],"type":"string","description":"Hint to route to the correct data source (optional — auto-detected)."}}}}},"output":{"properties":{"example":{}}}}},"responseSchema":{"example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":{"p10Cents":"0.1000","medianCents":"0.1000","p90Cents":"0.1000","minCents":"0.1000","maxCents":"0.1000","p95Cents":"0.1000","sampleCount":1,"varies":false,"failureChargeRate":1},"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2lor87pB2QZH2Z8sGlTMY","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","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 U.S. federal data sources, returning a fact-check result, with payment settled in USDC on Base via x402.","exampleAgentPrompt":"Can you fact-check this claim for me using U.S. federal data: 'The U.S. unemployment rate dropped below 4% in 2023' — check it in the economics domain.","exampleUseCases":[{"title":"Verify political spending claim","prompt":"Can you check whether this claim is accurate according to U.S. federal data: 'The Department of Defense received over $800 billion in the 2023 federal budget' — I want an authoritative verdict before I include it in my report."},{"title":"Validate public health statistic","prompt":"I'm drafting a health policy brief and want to confirm this before publishing — can you fact-check the claim that 'More than 40% of American adults are classified as obese according to official U.S. health data'?"},{"title":"Confirm economic figure accuracy","prompt":"Someone cited this statistic in a debate and I want to know if it holds up — can you verify using federal sources whether 'U.S. inflation peaked at over 9% in 2022' is actually supported by official government data?"}],"resultDescription":"A fact-check assessment indicating whether the submitted claim is supported, contradicted, or unverifiable based on U.S. federal data, likely including a verdict, confidence level, and relevant sourcing or context from official government datasets. Payment of $0.15 USDC is charged per call via x402 on Base.","failureModes":["Missing required 'claim' parameter returns a 400 or validation error","Claim is too vague or ambiguous for federal data to resolve — may return inconclusive result","Payment not authorized or x402 header missing — returns 402 Payment Required","Domain value not recognized — may fall back to general lookup or return an error","Federal data source for the specific domain is unavailable — may return partial or no result","Server timeout on Render free-tier infrastructure — may return 503 or hang"],"whenToPreferThis":"Use this endpoint when you need to verify a specific factual claim against authoritative U.S. government data sources and are willing to pay $0.15 USDC per check. Ideal for agents working in journalism, policy research, education, or compliance that need a quick, authoritative verdict on U.S.-federal-scope claims. Prefer this over general web search when you want structured fact-check output grounded in official federal data rather than scraped opinion or news articles.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:48:31.179Z","isFirstParty":false}