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EVM Address Code Inspector (Contract vs EOA Checker)
x402
EVM Address Code Inspector (Contract vs EOA Checker) is a paid API for AI agents from webtools402.176-109-107-191.sslip.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Checks whether an EVM address is a smart contract or an externally owned account (EOA) on Base, Ethereum, Arbitrum, Optimism, Polygon, or BNB, returning is_contract flag, deployed bytecode size, and keccak256 code hash.
Price / call$0.003
Success—
StatusUnknown
How this service works
Is an address a contract or an EOA on Base, Ethereum, Arbitrum, Optimism, Polygon or BNB (default Base)? Returns is_contract, deployed code size in bytes, and the keccak256 code hash (eth_getCode).
Output
Returns a JSON object with: is_contract (boolean indicating whether the address has deployed code), deployed code size in bytes, and the keccak256 hash of the deployed bytecode (from eth_getCode). If the address is an EOA, code size will be 0 and the hash will reflect empty code.
Example use cases
Example prompt
“Can you check if 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 is a smart contract or a regular wallet on Ethereum, and tell me the bytecode size and code hash?”
Technical details
Endpoint
GEThttps://webtools402.176-109-107-191.sslip.io/codeWhen to prefer
Use this endpoint when you need a fast, cheap, on-chain verification of whether an address is a deployed smart contract or a plain wallet (EOA) across the six most popular EVM chains. Ideal for pre-flight checks before interacting with an address (e.g., determining if you need ABI calls), for fraud/risk screening pipelines, or for enriching address metadata. Prefer this over a full transaction lookup when you only need code presence, size, and hash rather than transaction history.
Side effects
- Invalid address format (not a valid 0x hex address) — likely returns a 4xx error
- Unsupported network specified — only base, ethereum, arbitrum, optimism, polygon, bnb are valid
- RPC timeout or node unavailability for the requested network — may return 5xx or timeout
- Address not found / zero address edge cases — returns is_contract=false with size 0
- Payment failure (x402 protocol) — returns 402 if USDC payment not settled
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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