{"uid":"cap_VmYJrTuuJ7tZRLLWKpfaA","slug":"veritylayer-pro-verification-8d3f650a","name":"VerityLayer Pro Verification","description":"VerityLayer verifies whether a factual claim is true — fact-check, verify a claim, is this true. Independent, fail-closed verification for AI agents: returns a verdict (supported/unsupported/uncertain), a calibrated 0-1 confidence, reasoning, and evidence; abstains rather than guess. Every verdict includes an Ed25519-signed receipt — portable cryptographic proof of what was verified, free re-verification at /receipt/verify. Tier: pro — grounded premium synthesis (Opus).","url":"https://api.veritylayer.dev/verify/pro","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"claim":{"type":"string"},"context":{"type":"string"}}},"responseSchema":{"type":"json","example":{"verdict":"supported","evidence":["Encyclopaedia Britannica — Eiffel Tower, Paris, France."],"reasoning":"Multiple authoritative sources place the Eiffel Tower on the Champ de Mars in Paris, France.","confidence":0.97}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.35","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":"$0.35/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.35","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.35","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rdsKRacaKBR8AQtn60jD-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.35","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies AI-generated claims and citations against authoritative sources, returning a verdict, supporting evidence, reasoning, and a confidence score.","exampleAgentPrompt":"Can you run this through VerityLayer to check if it's actually true: 'The Mata v. Avianca case was decided by Judge P. Kevin Castel of the Southern District of New York in 2023'? I need to know the verdict, what evidence supports or refutes it, and how confident the system is.","exampleUseCases":null,"resultDescription":"A JSON object containing: a 'verdict' field (e.g. 'supported', 'refuted', 'unverifiable'), an 'evidence' array of authoritative source references that back the verdict, a 'reasoning' string explaining the determination, and a 'confidence' score between 0 and 1 indicating certainty.","failureModes":["Claim too vague or ambiguous to verify — returns low confidence or 'unverifiable' verdict","Source material unavailable or paywalled — may limit evidence breadth","Highly niche or recent claims may lack sufficient authoritative sources to assess","Malformed or missing claim input — returns validation error","Rate limit or payment failure — returns 402 or 429 status"],"whenToPreferThis":"Choose VerityLayer when you need a fail-closed, independent verification pass on AI-generated claims or citations before they reach end users — especially in legal, academic, journalistic, or compliance contexts where hallucinated sources carry serious risk. It is particularly suited when you need structured evidence and reasoning alongside a verdict, not just a binary pass/fail. Prefer it over generic search-based fact-checking when you want auditable, confidence-scored outputs with zero false-positive tolerance.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:32:57.781Z","isFirstParty":false}