{"uid":"cap_0pY-mWqzGOz9-sNM0gbFH","slug":"base-mainnet-wallet-balance-checker-693b5e66","name":"Base Mainnet Wallet Balance Checker","description":"Check a wallet's live balance on Base mainnet: native ETH (e.g. to confirm it has enough for gas) plus an optional ERC20 token balance (e.g. USDC) when a token contract address is supplied. Sourced from Base's official public RPC.","url":"https://x402-seller.onrender.com/chain/balance","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":{"token":{"type":"string","description":"Optional ERC20 token contract address to also check"},"address":{"type":"string","description":"Wallet address (0x...)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"token":{"type":["object","null"]},"source":{"type":"string"},"address":{"type":"string"},"network":{"type":"string"},"ethBalance":{"type":"number"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.012","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":"$0.012/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.012","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-UB6G4TkNvffFwkLE3zER","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.012","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the live ETH (and optionally ERC20 token) balance for a given wallet address on Base mainnet, sourced from Base's official public RPC.","exampleAgentPrompt":"What's the current ETH balance on Base mainnet for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045, and can you also check its USDC balance using the token contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913?","exampleUseCases":null,"resultDescription":"A JSON object containing the wallet address, network identifier ('base'), the native ETH balance as a number, an optional token balance object (if a token contract address was provided), and the RPC source string.","failureModes":["Invalid or malformed wallet address returns an error","Invalid ERC20 token contract address causes token balance lookup to fail","RPC node unavailability returns a 5xx error","Rate limiting or payment failure returns a 402 or 429 response","Address with zero balance returns 0 rather than an error"],"whenToPreferThis":"Use this endpoint when you need a real-time, on-chain wallet balance specifically on Base mainnet — including both native ETH and any ERC20 token. Prefer it over general-purpose blockchain explorers when you need a simple, paid, low-latency lookup with a clean JSON response and no API key setup beyond x402 payment.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:35:37.322Z","isFirstParty":false}