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EVM Address Contract Detection
x402
EVM Address Contract Detection is a paid API for AI agents from apexfaucet.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-18).
Checks whether an Ethereum-compatible address is a smart contract (vs. EOA) on Ethereum, Base, Arc, or BNB Chain, returning code size, proxy implementation addresses, and EIP-7702 delegation info.
Price / call$0.001
Success—
StatusUnknown
How this service works
Is this address a contract? On Ethereum, Base, Arc or BNB Chain: whether code is deployed, its size, the implementation behind an EIP-1967 or ZeppelinOS proxy, and an EIP-7702 delegation if the address is a wallet that delegates. Pass ?address=&chain=
Output
A JSON object containing: isContract (boolean), codeSize (bytes of deployed bytecode), the chain and block number at which the check was made, block timestamp, an eip7702DelegatesTo field (address or null), an eip1967Implementation field for EIP-1967 proxies, and a zeppelinosImplementation field for OpenZeppelin proxy patterns.
Example use cases
Token contract verification before trading
“Before I buy this token, can you check if 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum is actually a deployed smart contract and whether it's a proxy?”
DeFi protocol proxy inspection
“I want to know if the address 0x4200000000000000000000000000000000000006 on Base is a contract, and if so, what implementation contract it delegates to.”
EIP-7702 delegation check on BNB
“Can you look up 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c on BNB Chain and tell me whether it's a contract, its code size, and if it has any EIP-7702 delegation set?”
Technical details
Endpoint
GEThttps://apexfaucet.xyz/api/x402/evm-code?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, paid, multi-chain check of whether an address is a smart contract versus an EOA, especially when you also need proxy implementation addresses (EIP-1967, ZeppelinOS) or EIP-7702 delegation targets. Prefer this over free block explorers when you need programmatic, structured output without scraping, or when checking addresses on Arc chain which may not be indexed elsewhere.
Side effects
- Invalid address format (not matching 0x + 40 hex chars) returns validation error
- Unsupported chain name returns enum error
- Network RPC unavailability may cause timeout or error response
- Address that is valid but not yet indexed may return stale block data
- Payment failure returns 402 before any data is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"properties": {
"ok": {
"type": "boolean"
},
"data": {
"type": "object"
},
"paid": {
"type": "number"
}
}
},
"example": {
"ok": true,
"data": {
"ok": true,
"block": 52559423,
"chain": "base",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"codeSize": 1852,
"blockTime": "2026-10-13T16:16:33.000Z",
"isContract": true,
"eip7702DelegatesTo": null,
"eip1967Implementation": null,
"zeppelinosImplementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
"paid": 0.001
}
}Tags
x402
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