{"uid":"cap_Ne_7hIWEtXw6hH_uc82kd","slug":"evm-chain-balance-lookup-base-ethereum-via-x402-5e93dd75","name":"EVM Chain Balance Lookup (Base/Ethereum) via x402","description":"Pay-per-call website uptime/latency/TLS checks and fetch-to-Markdown, measured from Hub Europe (Germany). USDC on Base via x402. No account or API key.","url":"https://bluebirds.ccwu.cc:8443/v1/chain/balance?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":["chain","address"],"properties":{"chain":{"type":"string","example":"base","description":"base or ethereum"},"address":{"type":"string","example":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","description":"0x EVM address"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"block":36000000,"chain":"base","nonce":5,"address":"0x...","balance_eth":"0.0123","balance_wei":"12300000000000000"}},"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_CubZhs_COF3gj0vYJKVo1","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 ETH balance, nonce, and block info for a given EVM wallet address on Base or Ethereum, paid per-call via x402/USDC.","exampleAgentPrompt":"What's the current ETH balance and nonce for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base?","exampleUseCases":[{"title":"DeFi gas check before transaction","prompt":"Before I send a transaction, check if wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 has enough ETH on Base to cover gas fees."},{"title":"Wallet balance monitoring for treasury","prompt":"What's the current ETH balance in wei for our treasury wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B on Ethereum?"},{"title":"Verify airdrop recipient wallet activity","prompt":"Can you check the nonce on 0x1234567890abcdef1234567890abcdef12345678 on Base — I need to confirm it's an active wallet before sending the airdrop."}],"resultDescription":"Returns a JSON object containing the wallet address, chain name, current ETH balance in both ETH and wei units, account nonce, and the latest block number at time of query.","failureModes":["Invalid or malformed 0x address returns an error","Unsupported chain value (not 'base' or 'ethereum') causes rejection","Payment failure via x402 if USDC balance is insufficient","Network timeout if the target chain node is slow","Missing required queryParams (chain or address) returns a validation error"],"whenToPreferThis":"Use this endpoint when you need a lightweight, no-account-required way to check an EVM wallet's ETH balance or nonce on Base or Ethereum, especially in automated agent workflows where pay-per-call via x402/USDC is preferred over maintaining API keys or subscriptions.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T12:44:09.595Z","isFirstParty":false,"canonicalSlug":"evm-chain-balance-lookup-base-ethereum-via-x402-5e93dd75"}