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Ethereum Address Type & Token Standard Inspector
x402
Ethereum Address Type & Token Standard Inspector is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).
Identifies whether an Ethereum address is a wallet or contract, detects token standards (ERC-20/721/1155), retrieves name/symbol/decimals, and surfaces proxy/upgrade details, bytecode size, nonce, and ETH balance.
Price / call$0.005
Success—
StatusUnknown
How this service works
Identify what lives at a Ethereum address: wallet (EOA, including EIP-7702 delegation) or contract, which token standard it implements (ERC-20, ERC-721, ERC-1155), name and symbol, upgradeable-proxy implementation and admin, smart-wallet proxies, bytecode size, nonce and ETH balance.
Output
A JSON object containing: address kind label (e.g. 'ERC-20 token', 'EOA', 'smart wallet'), chain identifier, token name and symbol, decimals, total supply, isContract boolean, token standard flags (erc20/erc165/erc721/erc1155), proxy details (upgradeable boolean, implementation address, admin address), bytecode size in bytes, nonce, and native ETH balance.
Example use cases
Token contract due diligence
“I found this contract address 0xdAC17F958D2ee523a2206206994597C13D831ec7 — can you tell me if it's an ERC-20, what its name and symbol are, and whether it's hiding behind an upgradeable proxy?”
Verify wallet vs contract before transfer
“Before I send funds, can you confirm whether 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD is a plain wallet or a smart contract on Ethereum?”
Smart wallet proxy inspection
“I need to know the implementation address and proxy admin for the contract at 0xCB1355ff08Ab38bBCE60111F1bb2B784bE25D7e5 on Ethereum — is it an upgradeable proxy and what standard does it follow?”
Technical details
Endpoint
GEThttps://onchaincheck.dev/eth/contract?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, single-call identity snapshot of any Ethereum address — covering wallet vs contract classification, token standard detection, proxy architecture, and balance — rather than making multiple separate RPC calls. Ideal for due-diligence workflows, token metadata enrichment, or pre-transfer safety checks where you need to know exactly what you're dealing with before proceeding.
Side effects
- Invalid address format (not matching 0x + 40 hex chars) returns a validation error
- Non-existent or never-used address returns isContract false with zero balance and nonce
- Network timeout or RPC node unavailability may cause 5xx errors
- Address with no deployed bytecode classified as EOA even if it was previously a contract (selfdestruct)
- EIP-7702 delegated wallets may appear ambiguous between EOA and contract classification on older indexers
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"kind": "ERC-20 token",
"name": "USD Coin",
"chain": "eth",
"proxy": {
"admin": "0x807a96288A1A408dBC13DE2b1d087d10356395d2",
"upgradeable": true,
"implementation": "0x43506849D7C04F9138D1A2050bbF3A0c054402dd"
},
"symbol": "USDC",
"address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"decimals": 6,
"standards": {
"erc20": true,
"erc165": false,
"erc721": false,
"erc1155": false
},
"isContract": true,
"totalSupply": "48016325237.499139",
"bytecodeBytes": 2186,
"nativeBalance": "0"
}
}Tags
x402
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