{"uid":"cap_rkFfVsYxzca-RRVrnMT6k","slug":"wallet-profile-lookup-api-x402-1030f898","name":"Wallet Profile Lookup API (x402)","description":"Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.","url":"https://freetier-agent-api.pages.dev/api/wallet-profile?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":{"chain":{"enum":["base","ethereum"],"type":"string","description":"default base"},"address":{"type":"string","description":"wallet or contract address 0x..."}}}}},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"type":"eoa","chain":"base","nonce":42,"address":"0x...","ethBalance":"0.0123","tokenBalances":[{"symbol":"USDC","balance":"12.5"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_D9hs9HUWyyNztKuhbReo4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns on-chain wallet or contract profile data including ETH balance, token balances, nonce, and account type for a given address on Base or Ethereum.","exampleAgentPrompt":"Can you pull the full on-chain profile for wallet address 0xAbCd...1234 on Base — I want to see the ETH balance, any token holdings like USDC, and whether it's a regular wallet or a contract?","exampleUseCases":[{"title":"DeFi portfolio snapshot for a wallet","prompt":"Show me everything this wallet holds on Base — ETH balance, any ERC-20 tokens like USDC or WETH, and tell me if it's a regular wallet or a smart contract. The address is 0x1234567890abcdef1234567890abcdef12345678."},{"title":"Verify wallet activity before a transaction","prompt":"Before I send funds, can you check the nonce and ETH balance for 0xDeAdBeEf0000000000000000000000000000dEaD on Ethereum so I know it's an active wallet?"},{"title":"Identify whether an address is a contract","prompt":"I have this address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum — is it a smart contract or a regular EOA, and what's its current ETH and token balance?"}],"resultDescription":"A JSON object containing the account type (EOA or contract), chain, address, nonce, ETH balance as a string, and an array of token balances each with symbol and balance amount.","failureModes":["Invalid or malformed address format returns an error","Unsupported chain value returns a validation error","Address not found or zero activity may return empty balances","Payment not fulfilled via x402 returns HTTP 402","Network or RPC timeout may cause delayed or failed response"],"whenToPreferThis":"Choose this endpoint when you need a quick, no-signup on-chain wallet profile including balance and account type for Base or Ethereum, and you want to pay per call with USDC via x402 rather than managing API keys or subscriptions.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:05:06.240Z","isFirstParty":false,"canonicalSlug":"wallet-profile-lookup-api-x402-1030f898"}