{"uid":"cap_iWGQoBJvgKpjiQtVL_V9u","slug":"baselens-address-lookup-be65123a","name":"BaseLens Address 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–$0.004 USDC per call, no API key.","url":"https://baselens-api.vercel.app/v1/address?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":{"type":"contract","block":37000000,"nonce":1,"address":"0x8335…2913","chainId":8453,"ethBalance":"0","usdcBalance":"12.5"}},"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_iKlqS6Y9mtdtDtb_rC82j","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":"Returns on-chain profile data for a Base network address, including ETH/USDC balances, account type, nonce, chain ID, and block context.","exampleAgentPrompt":"Can you look up the on-chain profile for Base address 0x8335...2913 — I want to know if it's a contract or a wallet, and what its ETH and USDC balances are?","exampleUseCases":[{"title":"Verify wallet vs. contract on Base","prompt":"Is the address 0xAbC123...def456 on Base a smart contract or a regular wallet, and what's its current ETH balance?"},{"title":"Check USDC holdings for a Base address","prompt":"Can you tell me how much USDC and ETH is held at Base address 0x1234...5678 right now?"},{"title":"Pre-send address sanity check","prompt":"Before I send funds, can you confirm that 0x9999...aaaa on Base is an active account — what's its nonce and account type?"}],"resultDescription":"A JSON object containing the address type (EOA or contract), current block number, nonce, ETH balance, USDC balance, and chain ID (8453 for Base).","failureModes":["Invalid or malformed 0x address returns an error response","Address not found on Base mainnet (wrong chain) may return empty or zero balances","Payment failure via x402 protocol results in HTTP 402 and no data returned","Rate limiting or network timeouts from the underlying Base RPC node","USDC balance may reflect ERC-20 token only, not other stablecoins"],"whenToPreferThis":"Choose this endpoint when you need a quick, no-API-key lookup of a Base network address profile — especially ETH/USDC balances and account type — and are willing to pay $0.002 USDC per call via x402. Prefer this over Etherscan-style APIs when operating on Base L2 specifically and want pay-per-call pricing without subscription overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:30:20.433Z","isFirstParty":false,"canonicalSlug":"baselens-address-lookup-be65123a"}