{"uid":"cap_lcjcuzNef3TNApzPedJie","slug":"x402-trust-discovery-api-seller-lookup-by-wallet-ffef539b","name":"x402 Trust & Discovery API — Seller Lookup by Wallet","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/seller?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"payTo":{"type":"string","description":"Seller payTo wallet address (0x-prefixed)."}}},"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_pxmUUWJZfFFHrY0lGLtXG","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":"Returns reputation and onchain settlement data for a seller wallet address (payTo) on Base, helping agents assess whether an x402 endpoint's payee is trustworthy before sending payment.","exampleAgentPrompt":"Before my agent pays that x402 endpoint, can you look up the seller wallet 0x1234abcd... and tell me if they have a real onchain settlement history on Base and whether they're safe to pay?","exampleUseCases":[{"title":"Pre-payment seller vetting by agent","prompt":"My AI agent is about to pay an x402 API with payTo address 0xAbCd1234... — can you check that wallet's settlement history on Base and tell me if this seller looks legitimate before we send any USDC?"},{"title":"Scam detection for unknown API seller","prompt":"I found an x402 endpoint claiming to offer weather data, and the payTo wallet is 0x9F8e7D6c... — check whether that seller wallet has any real payment history or if it looks like a scam."},{"title":"Due diligence before bulk agent payments","prompt":"We're configuring our agent fleet to auto-pay a batch of x402 APIs. Can you pull the seller reputation for wallet 0xDeadBeef... so we can decide whether to whitelist it for automated payments?"}],"resultDescription":"Returns a JSON object containing onchain data about the seller wallet on Base, including settlement history, payment counts, and any available reputation signals — helping the caller assess whether the payTo address is a known, active, and trustworthy x402 recipient before making a payment.","failureModes":["Invalid or malformed 0x wallet address returns an error","Wallet has no onchain history — returns empty or minimal data, not an error","Service unavailable due to Base RPC issues","Rate limit exceeded for repeated lookups","Wallet exists but has zero x402 settlement events — ambiguous legitimacy signal"],"whenToPreferThis":"Use this endpoint when you have a payTo wallet address from an x402 endpoint and need to assess the seller's legitimacy before spending USDC. This is the right choice when you want onchain-backed seller reputation rather than just endpoint-level safety checks, or when you want to vet a new seller wallet before adding it to an agent's auto-pay whitelist.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T12:27:19.630Z","isFirstParty":false,"canonicalSlug":"x402-trust-discovery-api-seller-lookup-by-wallet-ffef539b"}