{"uid":"cap_-igZebcFpnCxs0Ot_kME0","slug":"aether-base-eth-balance-lookup-0ecdfedb","name":"Aether Base ETH Balance Lookup","description":"Pay-per-call Base onchain data, token risk verdicts and x402 payability audits over x402 (USDC on Base).","url":"https://aether-x402.vercel.app/v1/base/balance?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"}}},"responseSchema":{"type":"json","example":{"eth":"0.001","wei":"1000000000000000","address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_kLUB_AfCcu6wCiXptwcMw","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the ETH balance (in ETH and wei) for a given Base network wallet address, paid via x402 micropayment in USDC.","exampleAgentPrompt":"Can you check how much ETH the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 has on the Base network right now?","exampleUseCases":[{"title":"Verify wallet funding before transaction","prompt":"Before I send a transaction, can you check if the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 actually has any ETH on Base to cover gas?"},{"title":"Monitor airdrop recipient balances","prompt":"Can you look up the ETH balance on Base for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 so I can confirm the airdrop funds landed?"},{"title":"Due diligence on counterparty wallet","prompt":"I'm about to do a deal with someone — can you pull the current ETH balance on Base for their wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 so I know they actually have funds?"}],"resultDescription":"Returns a JSON object containing the wallet's ETH balance as a human-readable decimal string (e.g. '0.001'), the raw wei amount as a string, and the queried wallet address. Response reflects current onchain state on the Base L2 network.","failureModes":["Invalid address format (not a valid 0x-prefixed 40-hex-character address) returns a validation error","Payment failure via x402 if USDC balance is insufficient or x402 handshake fails","Address not found or zero balance may return 0 ETH without error","Rate limiting or RPC backend unavailability may cause timeout or 5xx error","Querying a mainnet Ethereum address that has no Base activity returns 0 balance"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call ETH balance check on the Base L2 network without setting up your own RPC node or managing API keys. It is ideal for AI agents that operate with USDC on Base and need to make onchain queries at minimal cost ($0.001 per call). Prefer this over self-hosted RPC solutions when you want zero infrastructure overhead and native x402 micropayment integration.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T18:37:37.945Z","isFirstParty":false,"canonicalSlug":"aether-base-eth-balance-lookup-0ecdfedb"}