{"uid":"cap_a7u8gzaz6pXem5Dwl-MFa","slug":"x402-trust-discovery-api-market-endpoint-bd7f6eb9","name":"x402 Trust & Discovery API — Market Endpoint","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/market?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{}},"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":"down","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_qlH5SBv0pXQYCuMI96F_2","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":"Returns a pre-purchase safety verdict (go / test-with-minimum / do-not-pay) for an x402 or MPP endpoint, plus credential compatibility checks, without spending funds","exampleAgentPrompt":"Before I pay it, check whether this x402 endpoint https://someapi.example.com/data is safe to call and whether my EIP-3009 credential will actually work with it.","exampleUseCases":[{"title":"Pre-payment scam check for x402 API","prompt":"I found this x402 endpoint at https://newdataapi.io/v1/prices — before my agent spends any USDC on it, can you check its onchain settlement history and tell me if it's safe to pay or if I should avoid it?"},{"title":"Credential compatibility before purchase","prompt":"My agent carries a Circle Gateway credential — will it actually be accepted at https://analyticsapi.xyz/v1/query before I bother trying to pay?"},{"title":"Market survey of payable endpoints","prompt":"I want to browse the x402 market to find endpoints I can actually pay with my EIP-3009 credential — show me what's available and which ones are verified safe."}],"resultDescription":"Returns a structured verdict (go / test-with-minimum / do-not-pay) for the queried endpoint, along with credential compatibility status (whether EIP-3009 or Circle Gateway will be accepted), onchain settlement history from Base, and reputation signals — all without initiating any payment.","failureModes":["Unknown or uncrawled endpoint URL returns no settlement history or inconclusive verdict","Invalid or malformed URL parameter causes a 400 error","Credential type not recognized returns an error or null compatibility result","Endpoint not yet indexed in the registry returns empty results","Rate limiting or service unavailability returns 429 or 503"],"whenToPreferThis":"Use this endpoint when an AI agent needs to verify the safety, legitimacy, and credential compatibility of an x402 or MPP endpoint before spending USDC. It is specifically designed for the pre-purchase inspection gap — no other registry or explorer returns a go/do-not-pay verdict or checks whether a specific credential (EIP-3009 vs Circle Gateway) is accepted. Prefer this over general blockchain explorers or x402scan when you need an actionable safety signal, not just raw data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T06:28:42.304Z","isFirstParty":false,"canonicalSlug":"x402-trust-discovery-api-market-endpoint-bd7f6eb9"}