{"uid":"cap_cvUbTfNy2zTJ7y6DW2jTo","slug":"x402-trust-discovery-api-pre-purchase-safety-check-c1696e78","name":"x402 Trust & Discovery API — Pre-Purchase Safety Check","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/guard?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","description":"x402 endpoint URL to check before paying it."},"credential":{"type":"string","description":"Optional: eip3009 or gateway. Answers whether the credential you carry can pay this endpoint at all."}}},"responseSchema":{"type":"json","example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_caeoccYMIy-SLDbcdc0Z-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether an x402 or MPP payment endpoint is safe to pay and whether your credential type (EIP-3009 or Circle Gateway) is compatible, returning a go/test/do-not-pay verdict before any funds are spent.","exampleAgentPrompt":"Before I pay it, can you check whether this x402 endpoint is safe and whether my eip3009 credential will actually work with it: https://someapi.example.com/v1/data?","exampleUseCases":[{"title":"Pre-payment scam check for new API","prompt":"I found this x402 API at https://unknown-provider.io/v1/report — can you check if it's legit and safe to pay before I actually spend anything on it?"},{"title":"Credential compatibility before purchase","prompt":"I only have a Circle Gateway credential — can you check whether https://dataservice.example.com/v1/prices will actually accept it, so I don't waste a transaction finding out it won't?"},{"title":"Onchain reputation check for AI agent","prompt":"My agent is about to auto-pay https://analytics.example.com/v1/insights using eip3009 — can you pull its settlement history and safety verdict so I can decide whether to allow it?"}],"resultDescription":"A JSON response containing a safety verdict (go, test-with-minimum, or do-not-pay), credential compatibility status indicating whether the specified credential type (eip3009 or gateway) can pay the endpoint, and supporting data from onchain settlement history on Base.","failureModes":["URL not found or not an x402 endpoint — endpoint returns unknown or unresolvable status","Invalid credential type string — returns error on unrecognized credential value","Endpoint has no onchain history — verdict may be inconclusive or conservative","Network timeout reaching the target URL — may return a connectivity error","Malformed URL input — returns validation error"],"whenToPreferThis":"Use this endpoint when an AI agent needs to verify an x402 or MPP payment endpoint before spending funds, especially when credential compatibility (EIP-3009 vs Circle Gateway) is uncertain. It is the only dedicated pre-purchase safety service for this market rather than a generic registry or explorer, and it returns actionable verdicts without requiring an actual payment attempt.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T04:28:54.820Z","isFirstParty":false,"canonicalSlug":"x402-trust-discovery-api-pre-purchase-safety-check-c1696e78"}