{"uid":"cap_ZlTxz2k3krVhYJnUYBHan","slug":"x402-trust-discovery-api-onchain-token-lookup-9822f900","name":"x402 Trust & Discovery API — Onchain Token Lookup","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/onchain/token?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"address":{"type":"string","description":"ERC-20 contract address on Base."}}},"responseSchema":{"type":"json","example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_iOTlxiZRT7i4iKZrfTnRu","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns onchain data for an ERC-20 token contract address on Base, without requiring payment credentials","exampleAgentPrompt":"Can you look up the onchain token data for the ERC-20 contract at address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base?","exampleUseCases":[{"title":"Verify token contract before paying","prompt":"Before I pay an x402 endpoint that charges in some token, can you pull the onchain details for the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base so I know what I'm actually dealing with?"},{"title":"Identify unknown token in wallet","prompt":"I see an unknown token in my Base wallet with contract address 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb — can you fetch its onchain data so I can figure out what it is?"},{"title":"Audit token used by API marketplace","prompt":"I'm building an agent that pays x402 APIs and I need to verify the token contract 0x2Ae3F1Ec7F1F5012CFEab0185bfc7aa3cf0DEc22 on Base is a legitimate ERC-20 — can you grab the raw onchain info for it?"}],"resultDescription":"Returns onchain data for the specified ERC-20 token contract on Base, likely including token name, symbol, decimals, total supply, and other contract-level metadata available without authentication or payment.","failureModes":["Invalid or malformed contract address returns an error","Contract address does not exist on Base network","Address is a wallet address rather than a token contract","Network or RPC unavailability causes timeout","Contract exists but is not a standard ERC-20, returning partial or empty data"],"whenToPreferThis":"Use this endpoint when you need keyless, no-credential onchain token data for a Base ERC-20 contract — particularly in x402/MPP agent workflows where you want to verify a payment token before committing a transaction. Prefer this over direct RPC calls when you want a simple HTTP GET interface without managing a Web3 provider.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T05:29:24.495Z","isFirstParty":false,"canonicalSlug":"x402-trust-discovery-api-onchain-token-lookup-9822f900"}