{"uid":"cap_K-7yeFSLiyTht_uI4Jeb-","slug":"evm-chain-balance-lookup-rockndefi-xyz-85085265","name":"EVM Chain Balance Lookup (rockndefi.xyz)","description":"Pay-per-call website uptime/latency/TLS checks and fetch-to-Markdown, measured from US Central (St. Louis). USDC on Base via x402. No account or API key.","url":"https://rockndefi.xyz: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_oKJH2kP7ltTiQZKHvTXAw","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":"Fetches the native token balance (ETH/ETH-equivalent) and nonce for a given EVM address on Base or Ethereum, paid per-call via USDC on Base.","exampleAgentPrompt":"What's the current ETH balance and nonce for the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base?","exampleUseCases":[{"title":"DeFi portfolio balance check","prompt":"Can you check how much ETH the address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 currently holds on Base, including its nonce?"},{"title":"Pre-transaction nonce verification","prompt":"Before I send a transaction, can you look up the current nonce and ETH balance for 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B on Ethereum so I know what to set?"},{"title":"Wallet monitoring for low balance alert","prompt":"Check the ETH balance of 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Base and tell me if it's below 0.01 ETH."}],"resultDescription":"Returns a JSON object with the queried address, chain name, current block number, nonce, native token balance in ETH (human-readable string), and balance in wei (raw integer equivalent).","failureModes":["Invalid or malformed 0x address returns an error","Unsupported chain value (anything other than 'base' or 'ethereum') returns an error","Network or RPC node unavailability may cause timeouts","Payment failure via x402 (insufficient USDC balance) prevents the call from executing"],"whenToPreferThis":"Choose this endpoint when you need a quick, no-account-required on-chain balance and nonce lookup for a Base or Ethereum address, especially in agent pipelines that support x402 micropayments. Prefer it over node RPC calls when you lack direct RPC access or want a simple HTTP GET without managing Web3 libraries.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T06:36:19.032Z","isFirstParty":false,"canonicalSlug":"evm-chain-balance-lookup-rockndefi-xyz-85085265"}