{"uid":"cap_EsS_tk4Sq2Fdrr3_bCj5F","slug":"fiatdock-eth-balance-on-base-cfbaa91a","name":"FiatDock ETH Balance on Base","description":"ETH balance of any address on Base (wei + ETH). Pay-per-call via x402.","url":"https://fiatdock.com/v1/chain/eth-balance","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"address":{"type":"string","description":"A 40-hex EVM address (0x…)"}}},"responseSchema":{"type":"json","example":{"eth":"1","wei":"1000000000000000000","asOf":"2026-07-30T00:00:00.000Z","address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"base"}},"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_BaiKiP83QpA9U4gjjMF7V","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 both wei and ETH) of any address on the Base network, with a timestamp.","exampleAgentPrompt":"What's the current ETH balance of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base? Give me both the ETH amount and the raw wei value.","exampleUseCases":[{"title":"Gas sufficiency check before transaction","prompt":"Before I send this transaction, check if 0xAbCd1234... has enough ETH on Base to cover gas fees — tell me the current ETH balance in both ETH and wei."},{"title":"Wallet funding verification for onboarding","prompt":"I need to confirm that the new user wallet 0x1234abcd... is funded on Base — what's its ETH balance right now?"},{"title":"DeFi position monitoring for ETH collateral","prompt":"Keep an eye on 0xDEF456... — what's the current ETH balance on Base so I can see if the collateral level is still healthy?"}],"resultDescription":"Returns a JSON object with the address's ETH balance as a decimal string (eth), the raw wei amount as a string (wei), the queried address (address), the network name (base), and an ISO 8601 timestamp (asOf) indicating when the balance was read.","failureModes":["Invalid or malformed Ethereum address returns an error response","Address with zero balance returns eth: '0' and wei: '0' (not an error)","Network connectivity issues to Base RPC may return a timeout or upstream error","Payment failure via x402 (insufficient USDC) blocks the call before execution"],"whenToPreferThis":"Choose this endpoint when you need a fast, pay-per-call ETH balance lookup on Base without managing your own RPC infrastructure. It's ideal for agents that need native token balance as a lightweight chain primitive — especially when already operating within the x402 payment ecosystem on Base. Prefer it over full address intelligence endpoints when you only need ETH balance and not contract metadata or USDC balance.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:45:15.481Z","isFirstParty":false}