{"uid":"cap_psBvkJWuk_OO7q09BVxyb","slug":"freshness-claim-verifier-9831ac8e","name":"Freshness / Claim Verifier","description":"Verify a factual claim against fresh web evidence.","url":"https://mcp.dropenginehq.com/api/verify-claim?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"claim":{"type":"string","maxLength":2000,"minLength":8},"freshness_days":{"type":"integer","maximum":3650,"minimum":1},"preferred_domains":{"type":"array","items":{"type":"string","pattern":"^[a-zA-Z0-9.-]+$","maxLength":253,"minLength":1},"maxItems":10}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_v847mHVhmbX88PIVJ_tVa","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies a factual claim against fresh web evidence within a specified recency window, optionally scoped to preferred domains.","exampleAgentPrompt":"Can you fact-check this claim for me: 'Elon Musk is currently the CEO of Tesla' — check against web sources from the last 30 days, and focus on results from reuters.com and bloomberg.com?","exampleUseCases":[{"title":"Journalism claim verification","prompt":"I'm writing an article and need to verify this claim: 'Global EV sales surpassed 10 million units in 2023.' Can you check it against web evidence from the last 90 days, preferably from automotive industry sites like reuters.com or electrek.co?"},{"title":"AI agent hallucination guard","prompt":"Before my agent uses this as a fact, can you verify: 'The US Federal Reserve raised interest rates in Q1 2024' — check recent sources from the past 60 days?"},{"title":"Competitive intelligence freshness check","prompt":"Can you check whether this claim is still accurate: 'Stripe's latest valuation is $65 billion' — use web evidence from the past 7 days, focusing on techcrunch.com and bloomberg.com?"}],"resultDescription":"Returns a verification result indicating whether the claim is supported, refuted, or unverified by fresh web evidence, along with supporting source URLs, evidence snippets, and a confidence or freshness assessment tied to the specified recency window.","failureModes":["Claim text is too short (under 8 characters) or too long (over 2000 characters) — returns validation error","freshness_days out of range (below 1 or above 3650) — returns validation error","No fresh web evidence found within the specified freshness window — returns unverified result","Preferred domain(s) have no indexed or accessible content — reduced evidence coverage","Ambiguous or highly contested claims may return low-confidence or inconclusive results","Payment failure (insufficient USDC balance or x402 protocol error) — returns 402 Payment Required","Network timeout or upstream search service unavailability — returns 503 or timeout error"],"whenToPreferThis":"Choose this endpoint when you need to ground-truth a specific factual claim against real, recent web evidence — especially when recency matters (e.g., claims about current events, prices, leadership, regulations, or statistics). It is preferable to static knowledge bases or LLM memory when the claim may have changed recently. Use it over general web search when you need a structured verification verdict rather than raw search results. The domain filtering option makes it ideal when you want verification scoped to authoritative or trusted sources only.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T00:44:48.673Z","isFirstParty":false,"canonicalSlug":"freshness-claim-verifier-9831ac8e"}