{"uid":"cap_rkkzaZ8QMN1OaNmhLxKb7","slug":"x402-api-router-facts402-recommend-b6bd78f7","name":"x402 API Router (facts402 Recommend)","description":"Use when an agent must find which x402 API to call: takes need (the task in words) and returns the top-k paid endpoints (url, method, price, network, 30-day on-chain buyers, live-402 probe, risk flags, score) ranked over the x402-list.com catalog (CC BY 4.0) and sellers' own 402s. Own listings use the same formula. No match = 404. $0.005 USDC on Base; charged only on 2xx, never for invalid input.","url":"https://api.facts402.com/v1/recommend?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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"},"queryParams":{"type":"object","required":["need"],"properties":{"k":{"type":"string","pattern":"^([1-9]|10)$","description":"Number of picks, 1-10 (default 5)"},"need":{"type":"string","maxLength":200,"minLength":2,"description":"What you want to do, in plain words, e.g. 'web search' or 'IBAN validation'"},"network":{"type":"string","description":"CAIP-2 payment network (default eip155:8453) or 'any'"},"max_price":{"type":"string","pattern":"^\\d+(\\.\\d+)?$","description":"Max price per call in USD (default 0.05)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ULL3GaXBlMCDcX4padiXy","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Given a plain-English task description, returns the top-k ranked paid x402 API endpoints from the x402-list.com catalog, scored by relevance, on-chain buyer count, recency, and live liveness probing.","exampleAgentPrompt":"I need to do IBAN validation — can you search the x402 catalog and show me the top 3 paid API endpoints I could call for that, priced under $0.02, on Base mainnet?","exampleUseCases":[{"title":"Finding a sanctions-screening API","prompt":"I need to screen a company name against OFAC — find me the top 5 paid x402 APIs for sanctions or watchlist screening, ranked by how many buyers they have, and keep it under $0.05 per call."},{"title":"Choosing cheapest email-check endpoint","prompt":"Can you look up which x402 APIs are available for email address validation, max price $0.01, and give me the top 2 options with their liveness status and buyer counts?"},{"title":"Discovering APIs for an autonomous agent","prompt":"My agent needs to do web search — search the x402 catalog for the best paid endpoints for web search, return the top 5 ranked by relevance and on-chain popularity, on any network."}],"resultDescription":"An ordered list of up to k x402 API endpoint records, each containing: endpoint URL, HTTP method, price per call, payment network, 30-day on-chain buyer count, live 402 probe result, risk flags, and a composite relevance score. Returns 404 with no charge if no match is found.","failureModes":["404 returned when no catalog entry matches the need query — not charged","Invalid k value (must be 1-10) causes validation error","max_price filter too low may exclude all results, returning empty or 404","Network filter (CAIP-2) with no matching endpoints yields no results","Malformed need parameter (too short or too long) rejected by schema"],"whenToPreferThis":"Use this endpoint when an AI agent needs to dynamically discover which paid x402 API to call for a given task, especially when the agent doesn't know the specific endpoint URL in advance. Prefer this over static API registries when you need live liveness probes, on-chain buyer signals, and price filtering to select the best option at runtime.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-02T12:30:33.555Z","isFirstParty":false,"canonicalSlug":"x402-api-router-facts402-recommend-b6bd78f7"}