{"uid":"cap_oJxxnXE66L3yqeFv5Q-KN","slug":"verified-catalog-lookup-22d70fd0","name":"Verified Catalog Lookup","description":"Is an x402 endpoint reliable for task X at price <= Y? Facts from our own paid calls: receipts with settlement tx, delivered yes/no and a known-answer pass/fail. Pricing: 5 free lookups per client per UTC day, then HTTP 402 with an x402 payment requirement of $0.02 USDC on Base per lookup. Payment buys query access only. It never changes results, sort order, listings, check results or known-answer outcomes: free, paid and exempt lookups run the same code on the same data and get identical results. Not investment advice; we hold no customer funds.","url":"https://verified-catalog-lookup.withgrokbot.workers.dev/v1/lookup/paid?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","properties":{"n":{"type":"string","description":"paid receipts per service, 1-20 (default 5)"},"ref":{"type":"string","description":"where you found this lookup (optional, attribution only)"},"task":{"type":"string","description":"task name, e.g. web-search (see /v1/tasks); task or endpoint is required"},"limit":{"type":"string","description":"services returned, 1-20 (default 10)"},"payer":{"type":"string","description":"your 0x wallet (optional)"},"client":{"type":"string","description":"your agent or app name (optional)"},"endpoint":{"type":"string","description":"a service id or endpoint URL instead of a task"},"max_price":{"type":"string","description":"maximum listed price per call, USD, e.g. 0.01"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"query":{"n":5,"task":"web-search","limit":10,"endpoint":null,"max_price_usd":0.01},"access":{"tx":"0x...","tier":"paid","charged_usd":"0.02"},"matched":1,"results":[{"id":"example-search","stale":false,"endpoint":"https://example.com/search","receipts":[{"tx":"0x...","time":"2026-10-02T18:48:42Z","quality":"pass","delivered":true,"charged_usd":"0.01"}],"pass_rate":1,"price_usd":"0.01"}],"facts_only":[],"payment_policy":"Payment buys query access only. It never changes results, sort order, listings, check results or known-answer outcomes: free, paid and exempt lookups run the same code on the same data and get identical results."}},"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_Tju6KMGBPF4tRsnQo1Ilk","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":"Looks up x402 API endpoints for a given task at or under a price cap, returning reliability data from real paid receipts and known-answer pass/fail results.","exampleAgentPrompt":"Find me up to 10 verified x402 endpoints for the 'web-search' task priced at $0.01 or less, showing 5 paid receipts each, so I can pick the most reliable one.","exampleUseCases":[{"title":"Selecting a reliable web-search API","prompt":"I need to pick a web-search x402 endpoint for my agent — can you find me up to 10 options priced at $0.01 or less, with at least 5 paid receipt verifications each, so I can see which ones have the best pass rates?"},{"title":"Vetting a specific endpoint before using it","prompt":"Before I call 'https://example-search.com/api/search' in production, can you look it up in the verified catalog and show me its recent paid receipts and pass/fail history?"},{"title":"Finding cheap summarization APIs for budget agent","prompt":"My agent needs a summarization service costing no more than $0.005 per call — can you look up verified x402 endpoints for the 'summarize' task and return the top 5 results with their reliability scores?"}],"resultDescription":"Returns a JSON object with the query parameters echoed, payment access metadata (tx hash, tier, charged USD), total matched count, and a results array where each entry includes service ID, endpoint URL, staleness flag, a list of paid receipt objects (tx, timestamp, quality pass/fail, delivered, charged USD), aggregate pass rate, and listed price. Also includes a 'facts_only' array and a payment policy statement confirming results are not influenced by payment status.","failureModes":["Missing required 'task' or 'endpoint' parameter returns an error — at least one must be provided","max_price out of range or malformed causes a validation error","n or limit outside 1-20 bounds returns an error","Payment not completed or insufficient USDC balance blocks access","No matching services found returns matched:0 with empty results array","Stale data flagged via stale:true on individual results if receipts are outdated"],"whenToPreferThis":"Use this endpoint when an AI agent needs to discover and rank x402-compatible API services for a specific task with objective reliability evidence — real paid receipts and known-answer pass/fail — rather than relying on unverified listings. Prefer it over general API directories when budget constraints (max_price) matter and when agent decision-making depends on proven uptime and quality, not just advertised specs.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T06:34:10.089Z","isFirstParty":false,"canonicalSlug":"verified-catalog-lookup-22d70fd0"}