{"uid":"cap_IIrcrD8NS_5sCcrt8KN85","slug":"baselens-contract-verification-lookup-7d6b2933","name":"BaseLens Contract Verification Lookup","description":"Base address, ERC-20 balance, token price, recent transfers, Basename/ENS resolve, contract verification, tx summaries and gas over x402 and MCP. $0.001–$0.004 USDC per call, no API key.","url":"https://baselens-api.vercel.app/v1/contract?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","description":"0x-prefixed Base address"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"notes":["Upgradeable proxy…"],"owner":"0x3ABd…6df7","sourcify":{"name":"FiatTokenProxy","match":"exact_match","verified":true},"isContract":true,"proxyImplementation":"0x2Ce6…D779"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nHZMhSbAfV4KIZurOkIp9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns contract verification status, owner, proxy implementation, and Sourcify metadata for a given Base blockchain address","exampleAgentPrompt":"Is the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base verified? I want to know the contract name, whether it's a proxy, and who owns it.","exampleUseCases":[{"title":"Vetting a DeFi protocol contract","prompt":"Before I interact with this Base contract at 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599, can you check if it's verified on Sourcify, whether it's a proxy, and what the implementation address is?"},{"title":"Detecting EOA vs smart contract","prompt":"Can you tell me if 0x3ABd6df74F2E8Df5D0d103c7c5a5A21a9B2Cb85 on Base is actually a smart contract or just a regular wallet address?"},{"title":"Auditing a token contract for ownership","prompt":"Who is the owner of the USDC contract on Base at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, and is it an upgradeable proxy? I need the verification details too."}],"resultDescription":"A JSON object containing: isContract (boolean), owner address, Sourcify verification details (name, match type, verified flag), proxy implementation address if applicable, and any notes about upgradeability or contract structure.","failureModes":["Invalid or malformed address returns an error","EOA (non-contract) addresses return isContract: false with limited data","Unverified contracts return verified: false with no Sourcify name","Rate limiting or payment failures via x402 protocol","Address not found on Base mainnet"],"whenToPreferThis":"Use this endpoint when you need to verify whether a Base blockchain address is a smart contract, check its Sourcify verification status, discover proxy/implementation relationships, or identify contract ownership — all without managing an API key, paying only $0.003 USDC per call via x402.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:39:34.841Z","isFirstParty":false,"canonicalSlug":"baselens-contract-verification-lookup-7d6b2933"}