{"uid":"cap_4IyyFS2IfONJ50bqv8RQg","slug":"evm-native-coin-balance-lookup-43fc7693","name":"EVM Native Coin Balance Lookup","description":"Native coin balance for one address, on any of ten EVM chains — Genesis402 / UnyKorn Operator Network","url":"https://twin.unykorn.org/evm-native-balance?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"params":{"type":"object","properties":{"block":{"type":"string"},"chain":{"enum":["ethereum","base","polygon","arbitrum","optimism","bsc","avalanche","gnosis","linea","scroll"],"type":"string"},"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"}}}}},"responseSchema":{"type":"json","example":{"ok":true,"type":"evm-native-balance","receipt":{"tx_hash":"0x<64hex>","amount_usd":0.002,"receipt_id":"g402-<16hex>"},"generated_at":"<iso8601>"}},"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_HolaqzcacVVr9SNphnwa8","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 native coin balance (ETH, MATIC, BNB, etc.) for a given wallet address on any of ten supported EVM-compatible blockchains.","exampleAgentPrompt":"What's the current ETH balance for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet?","exampleUseCases":[{"title":"Portfolio balance snapshot","prompt":"Check the native coin balance for 0xAbCd1234567890AbCd1234567890AbCd12345678 on Base — I want to know how much ETH is sitting in that wallet right now."},{"title":"Multi-chain treasury audit","prompt":"What's the MATIC balance for address 0x1234567890AbCdEf1234567890AbCdEf12345678 on Polygon? I need to verify our treasury wallet still has funds."},{"title":"Historical block balance check","prompt":"Can you fetch the ETH balance for 0xDeAdBeEf1234567890DeAdBeEf1234567890dEaD on Arbitrum at block 150000000? I need the balance as it was at that specific point."}],"resultDescription":"Returns a JSON object with a boolean ok flag, the balance type identifier ('evm-native-balance'), and a receipt object containing the transaction hash, USD amount paid for the call, and a unique receipt ID, along with an ISO8601 timestamp of when the balance was generated.","failureModes":["Invalid or malformed Ethereum address (not matching 0x + 40 hex chars) returns an error","Unsupported chain name outside the ten allowed enum values causes rejection","Invalid block identifier results in lookup failure","Payment failure via x402 protocol prevents the call from completing","Network timeout or RPC failure on the target chain returns no balance data"],"whenToPreferThis":"Choose this endpoint when you need a fast, pay-per-call native coin balance lookup across any of ten major EVM chains (Ethereum, Base, Polygon, Arbitrum, Optimism, BSC, Avalanche, Gnosis, Linea, Scroll) without setting up your own RPC infrastructure. It is ideal for agents that need on-demand, cross-chain balance checks with built-in micropayment billing via x402 and no API key management.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T02:24:19.172Z","isFirstParty":false,"canonicalSlug":"evm-native-coin-balance-lookup-43fc7693"}