{"uid":"cap_AkrTLDQZMqz9FkkUwPBYt","slug":"cortex-cloud-eth-balance-lookup-6577a798","name":"Cortex Cloud ETH Balance Lookup","description":"OpenAI-compatible AI and data API for agents. Pay per call in USDC on Base via x402 — no API keys, no subscriptions, no lock-in.","url":"https://api.cortexcloud.org/x402/v1/data/eth/balance","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"required":{"type":"string"},"properties":{"type":"string"}}},"responseSchema":{"type":"object","format":"application/json","example":{"address":"0x...","balance":"1.234","network":"ethereum"}},"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_4zHJl7kAUcSvtLN-L0O5g","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":"Retrieves the ETH balance of a given Ethereum wallet address on the Ethereum network","exampleAgentPrompt":"What's the current ETH balance for the wallet address 0xAbC123...? Just give me the balance in ETH on Ethereum mainnet.","exampleUseCases":[{"title":"DeFi portfolio balance check","prompt":"Check the ETH balance on Ethereum for wallet 0x742d35Cc6634C0532925a3b8D4C9B7e1aFb2e123 — I want to know how much ETH it currently holds."},{"title":"Pre-transaction liquidity verification","prompt":"Before I send a transaction, can you check whether 0xDead...Beef has at least 0.5 ETH available on Ethereum mainnet?"},{"title":"Automated treasury monitoring","prompt":"Pull the ETH balance for our treasury wallet 0x1234...abcd on Ethereum so I can see if we need to top it up."}],"resultDescription":"Returns a JSON object containing the queried wallet address, its current ETH balance as a decimal string, and the network name (e.g. 'ethereum'). Example: {\"address\":\"0x...\",\"balance\":\"1.234\",\"network\":\"ethereum\"}.","failureModes":["Invalid or malformed Ethereum address returns an error response","Address not found on Ethereum mainnet returns zero balance or error","Network congestion may cause delayed or stale balance data","Payment failure via x402/USDC results in 402 Payment Required without returning data","Rate limiting or service downtime returns 5xx errors"],"whenToPreferThis":"Use this endpoint when an AI agent needs to retrieve an Ethereum wallet's ETH balance on-demand without managing API keys or subscriptions. Ideal for pay-per-call agent workflows using x402/USDC micropayments on Base. Prefer this over RPC node providers when you want zero-setup, per-call billing with no long-term credential management.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:52:29.312Z","isFirstParty":false}