{"uid":"cap_a38OoI_OCdBp5JdEbyOlZ","slug":"unprice-contract-info-lookup-base-9d675343","name":"unprice Contract Info Lookup (Base)","description":"Tiny paid web services for agents. Pay per request with USDC on Base via x402, plus non-x402 Base USDC tx-hash checkouts for Merchant Feed Audit, Base USDC receipts, and recent wallet statements.","url":"https://volkov.evgeny.m2.fvds.ru/pay/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","properties":{"address":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"base","isContract":true,"bytecodeBytes":1}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qxX8aHv8s6XuKnygJyW3d","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up whether an Ethereum address on Base is a smart contract and returns basic bytecode metadata, paid per-request via USDC on Base using the x402 protocol.","exampleAgentPrompt":"Can you check if the address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is a smart contract on the Base network and tell me how big its bytecode is?","exampleUseCases":[{"title":"Verify smart contract before interaction","prompt":"Before I send funds, can you check if 0x4200000000000000000000000000000000000006 is actually a smart contract on Base, or just a regular wallet?"},{"title":"Audit unknown address type","prompt":"I found this address 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD in a transaction — can you tell me if it's a deployed contract on Base and roughly how large its bytecode is?"},{"title":"DApp integration check","prompt":"We're integrating with a new protocol on Base — can you verify that 0x2626664c2603336E57B271c5C0b26F421741e481 is a real smart contract and not an EOA before we wire it into our app?"}],"resultDescription":"Returns a JSON object with the queried address, the network name ('base'), a boolean isContract field indicating whether deployed bytecode exists at that address, and the bytecode size in bytes.","failureModes":["Invalid or malformed Ethereum address returns an error or empty result","Address not found on Base (e.g. typo) may return isContract: false with zero bytecode","Payment failure via x402 results in HTTP 402 and the request is not fulfilled","Network timeouts if Base RPC is slow or unavailable","Missing required 'address' query parameter causes request rejection"],"whenToPreferThis":"Choose this endpoint when you need a cheap, pay-per-use check of whether a Base network address is a smart contract without setting up your own RPC node or paying for a premium blockchain API subscription. Ideal for low-volume, on-demand contract verification tasks within AI agent workflows that already use x402/USDC micropayment infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T00:46:18.788Z","isFirstParty":false,"canonicalSlug":"unprice-contract-info-lookup-base-9d675343"}