{"uid":"cap_t39btYlz4yWygrpHaG-Ne","slug":"agent-evidence-api-claim-verification-1962b27c","name":"Agent Evidence API – Claim Verification","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-api.thx93.workers.dev/weather/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":{"result":[{"area":"Central Virginia","event":"Winter Storm Warning","severity":"Severe","description":"Heavy snow expected.","instructions":"Avoid travel."}]}},"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_sctWKdX8BGVTyeoiQ-eJY","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 a claim or fact-checks a statement against up to 5 specified public web sources, returning cited evidence passages that support, contradict, or fail to settle the claim.","exampleAgentPrompt":"Can you fact-check the claim 'The Eiffel Tower is 330 meters tall' against these two sources: https://en.wikipedia.org/wiki/Eiffel_Tower and https://www.toureiffel.paris/en — and show me the exact passages that support or contradict it, with citations?","exampleUseCases":[{"title":"Fact-checking a health claim","prompt":"I've seen people saying that 'vitamin C cures the common cold' — can you verify that claim against these three sources and give me the exact excerpts that support or contradict it, with their source URLs and retrieval times? https://www.mayoclinic.org/drugs-supplements-vitamin-c/art-20363932, https://www.nih.gov/news-events/nih-research-matters/vitamin-c-does-not-prevent-colds, https://www.cochrane.org/CD000980/ARI_vitamin-c-for-preventing-and-treating-the-common-cold"},{"title":"Legal or regulatory statement verification","prompt":"Please verify whether 'GDPR requires companies to respond to data access requests within 30 days' is accurate by checking these two pages and returning the specific cited passages: https://gdpr-info.eu/art-12-gdpr/ and https://ico.org.uk/for-organisations/guide-to-data-protection/guide-to-the-general-data-protection-regulation-gdpr/individual-rights/right-of-access/"},{"title":"Checking a product specification claim","prompt":"Can you fact-check the statement 'The Tesla Model 3 Long Range has a 358-mile EPA range' against these URLs and tell me whether the passages support, contradict, or are inconclusive about it — with the exact text, source URL, and content hash for each: https://www.tesla.com/model3 and https://www.fueleconomy.gov/feg/Find.do?action=sbs&id=48218"}],"resultDescription":"Returns an array of evidence result objects, each containing a passage of text from the retrieved web source, a verdict of whether it supports, contradicts, or fails to settle the claim, the source URL, the retrieval timestamp, and a content hash for auditability. If nothing is retrieved, no charge is applied.","failureModes":["Source URL is inaccessible or returns a non-200 response — no evidence retrieved, no charge","Claim is too ambiguous for any passage to be matched — returns inconclusive results","URL content is behind a paywall or requires authentication — retrieval fails silently","More than 5 URLs supplied — schema validation error","MCP tool name or input schema missing — request rejected with schema error","Rate limits or network errors from Cloudflare Workers — transient 5xx response"],"whenToPreferThis":"Choose this endpoint when you need grounded, cited evidence for or against a specific claim, particularly when you have specific authoritative URLs to check against. It is superior to general web search when auditability matters — each result includes a source URL, retrieval time, and content hash. Prefer it over LLM-generated fact-checks when you need verifiable, non-hallucinated source passages. It is especially valuable in journalism, compliance, legal research, and scientific contexts where traceable citations are required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T07:00:21.744Z","isFirstParty":false,"canonicalSlug":"agent-evidence-api-claim-verification-1962b27c"}