{"uid":"cap_A1gV4g-70Fen5rolvg5rV","slug":"base-eth-balance-lookup-eth-getbalance-3fae61ce","name":"Base ETH Balance Lookup (eth_getBalance)","description":"ARYSPHERE sells AI-written verdicts on Base token contracts (a grade, a one-liner, a roast and the contract's facts) and Base/Ethereum chain reads, paid per call in USDC on Base over x402 v2. No account and no API key.","url":"https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_eth_getbalance?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$","description":"0x + 40 hex"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"ok":true,"hex":"0x0","chain":"base","method":"eth_getBalance","result":0,"service":"x402_chain_reads_v1.base_eth_getbalance"}},"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_N6-X4Gzj0MIXgRIUEWb5L","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 the native ETH balance of a Base network address by calling eth_getBalance on-chain.","exampleAgentPrompt":"What's the current ETH balance of the Base address 0xAbCd1234...5678 right now?","exampleUseCases":[{"title":"DeFi bot pre-flight balance check","prompt":"Before executing the swap, check how much ETH is sitting in the Base wallet 0x1234567890abcdef1234567890abcdef12345678 so I know we have enough to cover gas."},{"title":"Portfolio dashboard wallet tracking","prompt":"Pull the current on-chain ETH balance for my Base address 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef so I can update the portfolio dashboard."},{"title":"Verify funding before NFT mint","prompt":"Check whether the Base address 0xaabbccddeeff00112233445566778899aabbccdd has any ETH balance — I need to confirm it's been funded before the NFT mint goes live."}],"resultDescription":"A JSON object containing: 'ok' (boolean success flag), 'result' (native ETH balance as a decimal integer in wei), 'hex' (balance in hexadecimal), 'chain' ('base'), 'method' ('eth_getBalance'), and 'service' identifier. A zero balance returns result: 0 and hex: '0x0'.","failureModes":["Invalid or malformed address (not matching 0x + 40 hex pattern) returns a validation error","Address not found or never used returns balance of 0 (not an error)","Network/RPC node unavailability causes timeout or 5xx error","Payment failure (x402 protocol) if USDC balance is insufficient"],"whenToPreferThis":"Use this endpoint when you need the native ETH balance on the Base L2 network specifically — not Ethereum mainnet. Choose this over general RPC calls when you want a simple, paid, no-infrastructure REST interface to Base on-chain data without setting up your own node or managing RPC keys.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-17T12:40:36.746Z","isFirstParty":false,"canonicalSlug":"base-eth-balance-lookup-eth-getbalance-3fae61ce"}