{"uid":"cap_VdfS57Rgm23Z97It00Hxq","slug":"skills-onesource-io-743fdbe0","name":"OneSource eth_getCode Contract Checker","description":"Check if an Ethereum address is a contract via eth_getCode - returns deployed 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whether an Ethereum address is a smart contract by retrieving its deployed bytecode via eth_getCode on multiple EVM networks","exampleAgentPrompt":"Is 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 a smart contract or a regular wallet on Ethereum mainnet — can you check its on-chain bytecode?","exampleUseCases":[{"title":"Validate token contract before trading","prompt":"Before I swap on this exchange, can you verify that 0x6B175474E89094C44Da98b954EedeAC495271d0F is actually a legitimate smart contract on mainnet and not just some random address?"},{"title":"Detect suspicious wallet addresses","prompt":"I'm reviewing some transaction history and want to know which of these addresses are contracts versus regular wallets. Can you check if 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 and 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D are contracts on Ethereum?"},{"title":"Multi-chain contract verification","prompt":"We need to check if this address has smart contract code deployed across different networks. Can you look up the bytecode for 0x4d224452801aCED8B2F0aebE155379bb5d594381 on both Ethereum mainnet and Base to see where this contract actually lives?"}],"resultDescription":"Returns the deployed bytecode at the given address on the specified EVM network. If bytecode is non-empty (not '0x'), the address is a smart contract; if it returns '0x', it is an externally owned account (EOA) with no code.","failureModes":["Invalid address format (not matching 0x + 40 hex chars) — 400 validation error","Unsupported network value — 400 enum validation error","Address not found or network RPC unavailable — 502 or timeout","Payment not provided or insufficient — 402 payment required"],"whenToPreferThis":"Use this endpoint when you need to programmatically determine whether an Ethereum-compatible address hosts a smart contract, or when you need the raw deployed bytecode for a contract across Ethereum mainnet, Base, Avalanche, Sepolia, or MegaETH. Prefer it over general block-explorer lookups when you need machine-readable bytecode in an agent workflow without scraping a UI.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:47:00.047Z","isFirstParty":false}