{"uid":"cap_XAQ9f4Q2nQ5VamFI24ifN","slug":"hearth-markdown-wallet-balance-lookup-f4eff18a","name":"Hearth Markdown - Wallet Balance Lookup","description":"Web page to clean Markdown for AI agents. Pay per call with x402 (USDC on Base).","url":"https://138-197-15-135.sslip.io/v1/base/wallet?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":["queryParams"],"properties":{"queryParams":{"type":"object","required":["address"],"properties":{"chain":{"type":"string","description":"Chain: base (default), ethereum, arbitrum, optimism"},"address":{"type":"string","description":"Address"}}}}}}},"responseSchema":{"type":"json","example":{"eth":"0","block":1,"chain":"base","nonce":0,"ethWei":"0","address":"0x…","isContract":false}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0025","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":"$0.0025/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0025","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0025","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_i5EmEIOpLrJzEFg70h8S1","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0025","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up the ETH balance, nonce, and contract status of a blockchain wallet address on Base, Ethereum, Arbitrum, or Optimism.","exampleAgentPrompt":"What's the current ETH balance and nonce for wallet address 0xAbC123… on Base — and is it a contract or a regular wallet?","exampleUseCases":[{"title":"Verify wallet before sending funds","prompt":"Before I transfer anything, can you check if 0x1234567890abcdef1234567890abcdef12345678 on Base is a smart contract or a regular wallet, and what its current ETH balance is?"},{"title":"Debug stuck transaction nonce","prompt":"I think a transaction is stuck — can you look up the current nonce for 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef on Ethereum so I know what nonce to use to replace it?"},{"title":"Audit portfolio address on Arbitrum","prompt":"Can you pull the ETH balance and block info for 0xaAbBcCdDeEfF00112233445566778899aAbBcCdD on Arbitrum so I can check if the funds have arrived yet?"}],"resultDescription":"Returns a JSON object containing the wallet's ETH balance (as a decimal string and in Wei), the current block number, the account nonce, whether the address is a smart contract, the chain name, and the queried address.","failureModes":["Invalid or malformed wallet address returns an error response","Unsupported chain value returns an error","Network congestion on the target chain may cause slow or failed RPC calls","Payment failure via x402 (insufficient USDC) prevents the request from completing","Address not found on the specified chain may return zero balances"],"whenToPreferThis":"Use this endpoint when you need lightweight, on-chain wallet data (balance, nonce, contract status) from EVM-compatible networks (Base, Ethereum, Arbitrum, Optimism) and are comfortable paying micro-fees per call via x402/USDC. Prefer this over heavier blockchain explorer APIs when you only need account-level data rather than transaction history or token balances.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-26T12:30:20.025Z","isFirstParty":false,"canonicalSlug":"hearth-markdown-wallet-balance-lookup-f4eff18a"}