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Ethereum Onchain Data – Address Type & Contract Metadata
x402
Ethereum Onchain Data – Address Type & Contract Metadata is a paid API for AI agents from ca-tax-api-mainnet.lxtap.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-23).
Identifies what lives at an Ethereum address: EOA wallet, EIP-7702 delegation, or contract, including token standard, name/symbol, proxy info, bytecode size, nonce, and ETH balance.
Price / call$0.005
Success—
StatusUnknown
How this service works
Pay-per-call data for AI agents, paid in USDC on Base with x402: token risk checks (rug check) on Base, Ethereum, Arbitrum, Optimism, Polygon and Solana, onchain reads (balances, transactions, gas, contracts, NFTs, whale trades, new pools, ENS and Basenames), ECB exchange rates, and Canadian sales tax and business days.
Output
Returns a structured object describing the address type (EOA or contract, including EIP-7702 delegation status), the token standard it implements (ERC-20, ERC-721, ERC-1155 or none), the contract's name and symbol where available, upgradeable proxy implementation address and admin, smart-wallet proxy details, bytecode size in bytes, the address's current nonce, and its ETH balance.
Example use cases
Token contract due diligence
“I found this Ethereum address 0xdAC17F958D2ee523a2206206994597C13D831ec7 — can you tell me if it's a contract, what token standard it follows, its name and symbol, and whether there's an upgradeable proxy behind it?”
Wallet vs contract disambiguation
“Before I send ETH to 0xde0B295669a9FD93d5F28D9Ec85E40f4cb697BAe, can you check if it's a regular wallet or a smart contract, and what its current ETH balance and nonce are?”
Smart wallet proxy inspection
“I'm auditing this Ethereum address 0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97 — is it a smart wallet proxy? If so, what's the implementation contract and admin, and how large is the bytecode?”
Technical details
Endpoint
GEThttps://ca-tax-api-mainnet.lxtap.workers.dev/eth/contract?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a comprehensive identity snapshot of any Ethereum mainnet address — especially when you need to distinguish EOAs from contracts, detect token standards, discover proxy patterns, or pull balance/nonce in a single call. Prefer this over raw RPC calls when you want normalized, human-readable output without building your own multicall logic.
Side effects
- Invalid address format (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error
- Address not found or zero-activity address may return minimal data with null fields
- RPC/node connectivity issues may cause timeouts or 5xx errors
- Rate limiting or payment failure returns 402 or 429 errors
- Newly deployed contracts may not yet be indexed
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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