{"uid":"cap_c2lGd7h5Qq4MuQs9VzdKN","slug":"x402-trust-discovery-api-endpoint-search-6dc6ab02","name":"x402 Trust & Discovery API — Endpoint Search","description":"Independent pre-purchase safety and reputation checks for x402 and MPP endpoints, plus keyless onchain data on Base. Accepts BOTH EIP-3009 and Circle Gateway credentials — only 141 of 788 Base-payable resources do, and a single-credential buyer is locked out of 53.8% of this market on one rail or 28.3% on the other. GET /v1/guard?url=&credential= answers whether the credential you carry can pay a given endpoint at all, before you try. Searching this market for \"is this API endpoint a scam\" returns registries and explorers but no dedicated service; that gap is what /v1/guard fills, inspecting an endpoint WITHOUT paying it and returning a go / test-with-minimum / do-not-pay verdict backed by onchain settlement history.","url":"https://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/search?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"q":{"type":"string","description":"Free-text capability query."},"limit":{"type":"integer","description":"Maximum results, 1-50."},"max_price":{"type":"number","description":"Maximum price per call in USD."},"min_payers":{"type":"integer","description":"Minimum distinct paying wallets."}}},"responseSchema":{"type":"json","example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_kJLczSiVnNgD8XgOyhqeS","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Searches the x402/MPP paid API marketplace by capability query, price, and payer count to discover endpoints available for micropayment","exampleAgentPrompt":"Search the x402 marketplace for endpoints that can do sentiment analysis, show me up to 10 results priced under $0.05 each, and only include ones with at least 5 distinct paying wallets.","exampleUseCases":[{"title":"Finding affordable data enrichment APIs","prompt":"Search the x402 API marketplace for any endpoints that do company or person data enrichment, limit to 20 results, max price $0.10 per call, and at least 3 distinct payers so I know they're real."},{"title":"Discovering image processing micropayment APIs","prompt":"Can you search x402 for image-related APIs — things like OCR, image captioning, or object detection — priced under $0.05 and return up to 15 results?"},{"title":"Exploring well-used x402 endpoints for an agent pipeline","prompt":"I want to find the most-used x402 endpoints for text generation or summarization — search for up to 25 results with a minimum of 20 distinct paying wallets so I know they're battle-tested."}],"resultDescription":"Returns a JSON list of matching x402/MPP endpoint records, each including the endpoint URL, capability description, price per call in USD, and number of distinct paying wallets, filtered and ranked according to the query parameters supplied.","failureModes":["Empty result set if no endpoints match the query or filters","Invalid limit value (outside 1–50 range) may return an error","max_price or min_payers filters that are too restrictive return zero results","Payment failure if the $0.03 USDC call fee cannot be settled","Stale index data if newly listed endpoints haven't been crawled yet"],"whenToPreferThis":"Use this endpoint when an AI agent needs to dynamically discover available x402 or MPP paid API endpoints by capability before committing to one, especially when filtering by budget or requiring social proof via payer count. Prefer this over static registries when you need fresh, ranked results with price and reputation signals in a single query.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T06:26:00.121Z","isFirstParty":false,"canonicalSlug":"x402-trust-discovery-api-endpoint-search-6dc6ab02"}