{"uid":"cap_bCqF1Oyu0dy3XT_fIHGz-","slug":"agent-evidence-api-5ebab3ee","name":"Agent Evidence API","description":"Verify a claim or fact check a statement against public web sources: send a question and up to 5 URLs, get cited evidence - passages that support, contradict or fail to settle it. Claim verification with a citation for every excerpt: source URL, retrieval time, content hash. Never charges when nothing is retrieved. Free to evaluate: the `sample` tool returns one real response at no cost, so you can judge the output before paying for your own question.","url":"https://agent-evidence.thx93.dev/mcp?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","toolName","inputSchema"],"properties":{"type":{"type":"string","const":"mcp"},"method":{"type":"string"},"example":{"type":"object"},"toolName":{"type":"string"},"transport":{"enum":["streamable-http"],"type":"string"},"description":{"type":"string"},"inputSchema":{"type":"object"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"sources":[{"title":"Company X - About","status":200,"evidence":[{"excerpt":"Company X manufactures centrifugal pumps at its facility.","relevance":"direct"}],"final_url":"https://company.example/about","retrieved_at":"2026-01-01T00:00:00.000Z","content_hash_sha256":"9f2c…"}],"assessment":{"basis":"1 source matched the question.","status":"supported"},"limitations":["Assessment uses deterministic lexical matching, not semantic reasoning."]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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_SdvJqbzmmbJH4Y43pmylj","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies claims and fact-checks statements against up to 5 user-supplied public web URLs, returning cited evidence passages with support/contradiction/inconclusive assessments.","exampleAgentPrompt":"Can you fact-check the claim that 'Acme Corp manufactures centrifugal pumps' against these two pages: https://acmecorp.com/about and https://acmecorp.com/products — and tell me whether each page supports, contradicts, or can't settle it, with the exact quote used?","exampleUseCases":[{"title":"Verifying a competitor's product claim","prompt":"I need to check whether the claim 'BrandX batteries last 10 years' is actually supported by their official product page at https://brandx.com/batteries — can you retrieve the relevant passages and tell me if they back it up or not?"},{"title":"Journalism source cross-check","prompt":"I'm writing an article and need to verify the claim 'the unemployment rate fell to 3.4% in January 2024' against these two sources: https://bls.gov/news.release/empsit.nr0.htm and https://reuters.com/economy/jan2024 — does either one support or contradict that figure?"},{"title":"Legal or compliance fact validation","prompt":"Can you check whether the statement 'Company Y is headquartered in Delaware' is confirmed or contradicted by their SEC filing page at https://sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=XYZ and their about page at https://companyy.com/about?"}],"resultDescription":"Returns a list of sources, each with their HTTP status, retrieved timestamp, content hash, and one or more evidence excerpts tagged as 'direct', or other relevance levels. A top-level assessment object summarizes whether the claim is supported, contradicted, or unsettled, with a plain-language basis statement. A limitations array notes caveats such as deterministic matching vs. semantic reasoning. Nothing is returned (and no charge applies) when no content is retrieved.","failureModes":["URL is inaccessible or returns non-200 status — source listed with error status, no evidence excerpts","Claim is too vague to match any passage — assessment returns 'unsettled' with empty excerpts","Paywall or JavaScript-rendered page blocks content retrieval — source returns empty evidence","No sources provided or all URLs fail — empty sources array, no charge applied","Network timeout on a URL — that source omitted or flagged with retrieval error"],"whenToPreferThis":"Choose this endpoint when you need verifiable, cited evidence from specific URLs rather than a broad web search. It is ideal when you already have candidate source URLs and need to confirm or refute a precise claim with quoted excerpts and provenance metadata (URL, timestamp, content hash). Prefer it over general search APIs when auditability and citation integrity matter — for journalism, compliance, legal research, or agent pipelines that must show their work. The per-call pricing and free sample tool make it low-risk to evaluate before committing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T12:30:20.353Z","isFirstParty":false,"canonicalSlug":"agent-evidence-api-5ebab3ee"}