{"id":"2702926b-c68c-4f53-9229-bc0e3fbf4c91","shortId":"AKKGwj","kind":"x402","title":"Sub-cent natural-language fact verification API for autonomous AI agents, paid via x402 USDC on Base.","tagline":"Sub-cent natural-language fact verification API for autonomous AI agents, paid via x402 USDC on Base.","description":"AgentUtil Verify is a fact-checking API designed for autonomous AI agents. You POST a natural-language claim (up to 500 characters) and receive a structured verdict indicating whether the claim is confirmed, stale, disputed, false, or unknown, along with a confidence score (0–1), the current known truth value, data freshness, and the number of sources consulted.\n\nThe service supports five claim categories—financial, entity, geo, product, and factcheck—which can be specified explicitly or auto-detected. An urgency parameter (standard, fast, deep) controls the verification depth. Beyond the core verify endpoint, the API exposes a trending endpoint (GET /v1/trending) that lists the most-queried claims in the last 24 hours, a stats endpoint, and standard agent-discovery metadata at .well-known/agent-service.json and .well-known/agent.json.\n\nPricing follows the x402 protocol on Base (EIP-155:8453) using USDC. Each paid request costs $0.004 (4000 base units at 6 decimals). A free tier of 25 queries per day per IP is available with no signup required. The endpoint returned a valid x402 version 2 challenge during probing, confirming it is live.","tags":[],"capabilities":["fact-verification","natural-language-input","structured-verdict","confidence-scoring","claim-categorization","urgency-levels","trending-claims","agent-discovery","x402-payment","usdc-on-base","caching","multi-source-lookup"],"categories":["search","llm","data-verification"],"synonyms":["fact check API","claim verification","truth verification","natural language fact checker","automated fact checking","claim validator","AgentUtil Verify","real-time fact check","entity verification"],"warnings":["No dedicated documentation page exists (/docs returns 404)","No information on rate limits beyond the 25/day free tier","Accuracy guarantees and source provenance are not documented"],"endpointUrl":"https://verify.agentutil.net/v1/verify","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","openapi":"https://verify.agentutil.net/openapi.json","version":"2","docs_url":"https://verify.agentutil.net/.well-known/agent-service.json","free_tier":"25 queries/day without payment — POST to endpoint directly","categories":["financial","entity","geo","factcheck"],"description":"Fact verification — returns verdict, confidence, current truth"},"payTo":"0x1357bef96ec515d250137d7eb712f0395eb5142d","amount":"4000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.820","qualityRationale":"Full OpenAPI 3.1 schema with request/response definitions, a live x402 challenge confirming the endpoint is operational, clear pricing, and a working landing page. Docked slightly because /docs, /pricing, and /README all return 404, so there is no extended documentation beyond the OpenAPI spec and landing 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'/agent-service.json':168 '/agent.json':173 '/v1/trending':142 '0':84 '0.004':190 '1':85 '2':220 '24':153 '25':201 '4000':191 '500':61 '6':195 '8453':183 'AgentUtil Verify' 'agent':13,32,51,161 'agent-discoveri':160 'agent-discovery' 'agentutil':39 'ai':12,31,50 'along':79 'api':9,28,46,136 'auto':118 'auto-detect':117 'automated fact checking' 'autonom':11,30,49 'avail':208 'base':19,38,180,192 'beyond':130 'caching' 'categori':104 'cent':3,22 'challeng':221 'charact':62 'check':45 'claim':58,71,103,149 'claim validator' 'claim verification' 'claim-categorization' 'confid':82 'confidence-scoring' 'confirm':73,224 'consult':98 'control':126 'core':132 'cost':189 'current':87 'data':91 'day':204 'decim':196 'deep':125 'depth':129 'design':47 'detect':119 'discoveri':162 'disput':75 'eip':181 'endpoint':134,140,157,214 'entiti':106 'entity verification' 'explicit':115 'expos':137 'fact':7,26,44 'fact check API' 'fact-check':43 'fact-verification' 'factcheck':110 'fals':76 'fast':124 'financi':105 'five':102 'follow':175 'free':198 'fresh':92 'geo':107 'get':141 'hour':154 'indic':68 'ip':206 'known':88,167,172 'languag':6,25,57 'last':152 'list':144 'live':227 'metadata':163 'most-queri':146 'multi-source-lookup' 'natur':5,24,56 'natural language fact checker' 'natural-languag':4,23,55 'natural-language-input' 'number':95 'paid':14,33,187 'paramet':122 'per':203,205 'post':53 'price':174 'probe':223 'product':108 'protocol':178 'queri':148,202 'real-time fact check' 'receiv':64 'request':188 'requir':212 'return':215 'score':83 'servic':100 'signup':211 'sourc':97 'specifi':114 'stale':74 'standard':123,159 'stat':156 'structur':66 'structured-verdict' 'sub':2,21 'sub-cent':1,20 'support':101 'tier':199 'trend':139 'trending-claims' 'truth':89 'truth verification' 'unit':193 'unknown':78 'urgenc':121 'urgency-levels' 'usdc':17,36,185 'usdc-on-base' 'use':184 'valid':217 'valu':90 'verdict':67 'verif':8,27,128 'verifi':40,133 'version':219 'via':15,34 'well':166,171 'well-known':165,170 'whether':69 'x402':16,35,177,218 'x402-payment'","prices":[{"id":"3210af7e-0d22-461a-a8f2-1e9b9a6e76db","listingId":"2702926b-c68c-4f53-9229-bc0e3fbf4c91","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x1357bef96ec515d250137d7eb712f0395eb5142d","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","openapi":"https://verify.agentutil.net/openapi.json","version":"2","docs_url":"https://verify.agentutil.net/.well-known/agent-service.json","free_tier":"25 queries/day without payment — POST to endpoint directly","categories":["financial","entity","geo","factcheck"],"description":"Fact verification — returns verdict, confidence, current truth"},"payTo":"0x1357bef96ec515d250137d7eb712f0395eb5142d","amount":"4000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:34.563Z"}],"sources":[{"listingId":"2702926b-c68c-4f53-9229-bc0e3fbf4c91","source":"x402_bazaar","sourceId":"https://verify.agentutil.net/v1/verify","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:34.563Z","lastSeenAt":"2026-04-22T04:02:49.926Z"}],"details":{"listingId":"2702926b-c68c-4f53-9229-bc0e3fbf4c91","quickStartSnippet":"curl -X POST https://verify.agentutil.net/v1/verify \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"claim\": \"The CEO of Apple is Tim Cook\"}'","exampleRequest":{"claim":"The capital of France is Paris","urgency":"standard","category":"geo"},"exampleResponse":{"cached":false,"service":"https://verify.agentutil.net","verdict":"confirmed","discover":"https://verify.agentutil.net/.well-known/agent-service.json","freshness":"live","confidence":0.95,"request_id":"abc123","source_count":2,"current_truth":"Paris"},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Free tier: 25 queries/day per IP, no signup required","source_url":"https://verify.agentutil.net"},{"claim":"Paid pricing: $0.004 per query via x402 USDC on Base","source_url":"https://verify.agentutil.net"},{"claim":"x402 challenge returned with amount 4000 USDC (6 decimals) on Base (eip155:8453)","source_url":"https://verify.agentutil.net/v1/verify"},{"claim":"Verdicts: confirmed, disputed, false, stale, unknown","source_url":"https://verify.agentutil.net"},{"claim":"Categories: financial, entity, geo, product, factcheck","source_url":"https://verify.agentutil.net"},{"claim":"OpenAPI spec describes POST /v1/verify, GET /v1/trending, GET /stats endpoints","source_url":"https://verify.agentutil.net/openapi.json"}],"useCases":["AI agents autonomously verifying factual claims before acting on them","Pipelines that cross-check LLM-generated statements against live data","Monitoring dashboards that flag stale or disputed financial or entity facts","Agent-to-agent workflows where one agent validates another's assertions","Automated content moderation checking user-submitted claims"],"bestFor":["Autonomous AI agents needing cheap, structured fact checks","High-volume pipelines requiring sub-cent per-query pricing","Developers who want zero-signup access via a free tier","x402-native agent ecosystems settling payments on Base"],"notFor":["Deep investigative journalism requiring nuanced sourcing and editorial judgment","Bulk historical data retrieval or dataset construction","Use cases requiring guaranteed 100% accuracy with legal liability"],"kindDetails":{},"updatedAt":"2026-04-22T01:17:02.610Z"}}