{"uid":"cap_cvFIDuO6tyqayVcpTo0BM","slug":"saver-verifier-4436e8ec","name":"SAVER Verifier","description":"SAVER Verifier — source-backed factual claim verification for autonomous AI agents.","url":"https://api.saververify.com/verify?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"claim":{"type":"string"},"context":{"type":"string"}}},"responseSchema":{"type":"json","example":{"status":"supported","evidence":["Relevant authoritative sources support the claim."],"confidence":0.98,"explanation":"The available evidence supports the claim."}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.2","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":"$0.2/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.2","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.2","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KCU3idxp8pDVsamklfvjI","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.2","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies factual claims against authoritative sources and returns a support verdict, evidence, and confidence score","exampleAgentPrompt":"Before you send that report, can you verify the claim that 'global renewable energy capacity surpassed fossil fuels in 2023' — I need to know if it's source-backed and how confident we should be?","exampleUseCases":[{"title":"Pre-action fact check for autonomous agent","prompt":"Before you book the flight, verify the claim that 'United Airlines allows carry-on bags up to 45 linear inches' — check if it's supported by authoritative sources and tell me the confidence level."},{"title":"News claim validation before publishing","prompt":"I'm about to publish a blog post that says 'The WHO declared mpox a global health emergency in 2024' — can you verify that claim is factually supported before I go live?"},{"title":"AI output hallucination guard","prompt":"The AI just told me that 'Python was created by Linus Torvalds in 1991' — can you fact-check that specific claim and give me the evidence and confidence score?"}],"resultDescription":"Returns a JSON object with a 'status' field (e.g. 'supported', 'refuted', 'unverifiable'), an 'evidence' array of relevant authoritative source excerpts or references, a 'confidence' score between 0 and 1, and an 'explanation' summarizing why the claim was or was not supported.","failureModes":["Claim is too vague or ambiguous to verify — returns low confidence or 'unverifiable' status","No authoritative sources found for an obscure or niche claim","Claim is in a domain with rapidly changing facts where sources may be outdated","Malformed or empty claim field causes validation error","Rate limiting or payment failure results in 402 or 429 response"],"whenToPreferThis":"Choose SAVER Verifier when an autonomous agent needs to gate an action on whether a factual claim is source-backed before proceeding — especially in high-stakes workflows like publishing, decision-making, or acting on retrieved information. Prefer this over generic search when you need a structured verdict (supported/refuted/unverifiable), a confidence score, and cited evidence rather than raw search results. Best suited for single discrete claims rather than broad topic research.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:31:26.192Z","isFirstParty":false,"canonicalSlug":"saver-verifier-4436e8ec"}