{"uid":"cap_dRGfjEKaTwlO3JnaiV3pB","slug":"freshproof-claim-verifier-fc7aafdb","name":"FreshProof Claim Verifier","description":"Verify a claim against a live public web source for autonomous agents. Returns deterministic document evidence, a confidence score, source metadata, and a verification verdict without generating unsupported claims.","url":"https://freshproof-api-mainnet.up.railway.app/v1/verify?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","pattern":"^https?://","maxLength":4096,"description":"Public HTTP or HTTPS source URL to retrieve."},"claim":{"type":"string","maxLength":1000,"minLength":1,"description":"Claim to evaluate against evidence located in the source."}}},"responseSchema":{"type":"json","example":{"source":{"finalUrl":"https://example.com/","statusCode":200,"contentType":"text/html","retrievedAt":"2026-07-28T08:30:00.000Z","requestedUrl":"https://example.com/","redirectChain":[]},"verdict":"supported","evidence":[{"quote":"Example Domain","locator":"Visible document heading matched by deterministic verification","sourceUrl":"https://example.com/","machineLocator":"h1"}],"warnings":[],"confidence":0.99,"contentHash":"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb","explanation":"The verdict is based only on the quoted heading found in the retrieved document."}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cKHeYloJNNNIcqVFDEHXM","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies a specific claim against a live public web source, returning a confidence score, document evidence, source metadata, and a verdict without hallucinating unsupported content.","exampleAgentPrompt":"Can you verify whether the claim 'Apple's market cap exceeded $3 trillion in January 2024' is supported by the content at https://en.wikipedia.org/wiki/Apple_Inc. and give me a confidence score and the exact evidence found?","exampleUseCases":[{"title":"Fact-check a news article claim","prompt":"Check whether the claim 'The Fed raised interest rates by 0.25% in March 2023' is actually supported by the content at https://www.federalreserve.gov/newsevents/pressreleases/monetary20230322a.htm — give me a verdict and the supporting evidence."},{"title":"Verify a competitor's pricing page","prompt":"I need you to verify whether the claim 'Competitor X charges $99/month for their Pro plan' is backed up by what's currently on their pricing page at https://competitor.com/pricing — return the confidence score and any direct evidence from the page."},{"title":"Confirm regulatory compliance disclosure","prompt":"Can you check if the claim 'This product is FDA-approved for use in children under 12' is supported by the content at https://www.fda.gov/some-approval-page and tell me the verdict along with the relevant document evidence?"}],"resultDescription":"Returns a deterministic verification verdict (e.g. supported, unsupported, inconclusive), a confidence score (0–1), extracted document evidence from the retrieved source, and source metadata including URL and retrieval timestamp — without generating any claims not present in the source.","failureModes":["URL is unreachable or returns a non-200 status, resulting in a retrieval error","URL points to non-public content behind a paywall or login, causing an access failure","Claim is too vague or ambiguous to evaluate deterministically","Source content does not contain sufficient text to evaluate the claim, yielding an inconclusive verdict","Malformed URL fails pattern validation and is rejected before retrieval","Claim exceeds 1000-character limit and is rejected with a validation error"],"whenToPreferThis":"Choose this endpoint when you need a deterministic, evidence-backed verdict on whether a specific claim is supported by a specific live public URL — especially in agentic workflows where hallucination must be avoided and a cited source is already known. Prefer this over general web search when you have a target URL and need traceable, reproducible evidence rather than a synthesized answer.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:37:28.286Z","isFirstParty":false,"canonicalSlug":"freshproof-claim-verifier-fc7aafdb"}