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Arbitrum One Address Inspector
x402
Arbitrum One Address Inspector is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-30).
Identifies the type and metadata of any Arbitrum One address: EOA wallet, ERC-20/721/1155 contract, proxy details, token name/symbol, bytecode size, nonce, and ETH balance.
Price / call$0.005
Success—
StatusUnknown
How this service works
Identify what lives at a Arbitrum One 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
Returns a JSON object with: address kind (e.g. 'ERC-20 token', 'EOA wallet'), chain, token name and symbol, decimals, total supply, proxy details (upgradeable flag, implementation address, admin address), standards flags (erc20/erc721/erc1155/erc165), isContract boolean, bytecode size in bytes, and native ETH balance.
Example use cases
Token contract due diligence
“I'm about to integrate a token at 0xaf88d065e77c8cC2239327C5EDb3A432268e5831 on Arbitrum — can you check if it's a real ERC-20 contract, what its name and symbol are, and whether it's behind an upgradeable proxy I should be aware of?”
Wallet vs contract classification
“Before I send funds, can you check if 0x1234567890abcdef1234567890abcdef12345678 on Arbitrum One is just a regular EOA wallet or an actual smart contract?”
Proxy admin and implementation lookup
“I need to find the current implementation contract and admin address for the upgradeable proxy at 0xaf88d065e77c8cC2239327C5EDb3A432268e5831 on Arbitrum.”
Technical details
Endpoint
GEThttps://onchaincheck.dev/arbitrum/contract?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive single-call profile of any Arbitrum One address — covering wallet vs contract classification, token standard detection, proxy architecture, and basic balances — rather than querying multiple specialized endpoints separately. Best for due diligence, integration checks, or agent decision-making before interacting with an unknown address on Arbitrum.
Side effects
- Invalid address format (not matching 0x + 40 hex chars) returns a validation error
- Address not found or network issue returns an error response
- Unverified or minimal contracts may return limited metadata
- Payment failure (insufficient x402 balance) blocks the request
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": "arbitrum",
"proxy": {
"admin": "0x2E0A67588cfBCAD40f9e4DD76052436190A77a68",
"upgradeable": true,
"implementation": "0x86E721b43d4ECFa71119Dd38c0f938A75Fdb57B3"
},
"symbol": "USDC",
"address": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"decimals": 6,
"standards": {
"erc20": true,
"erc165": false,
"erc721": false,
"erc1155": false
},
"isContract": true,
"totalSupply": "2595465640.458979",
"bytecodeBytes": 1852,
"nativeBalance": "0"
}
}Tags
x402
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