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Contract Identity
x402
Contract Identity is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Identifies whether a Base address is a contract or EOA wallet, detects token standards (ERC-20, ERC-721, ERC-1155) via ERC-165 and interface inference, and returns name, symbol, decimals, and bytecode size.
Price / call$0.002
Success—
StatusUnknown
How this service works
🆕 What sits at a Base address: contract or plain wallet, and if a contract, whether it declares ERC-721 or ERC-1155 via ERC-165 or carries the ERC-20 shape, plus name, symbol, decimals and code size. Interface support is read from the contract's own declaration first and only inferred when there is none — the ordering matters, because NFTs answer totalSupply() too.
Output
Returns whether the address is a contract or EOA; if a contract, identifies the token standard (ERC-20, ERC-721, ERC-1155) using ERC-165 declarations first and shape-based inference as fallback; includes name, symbol, decimals, and bytecode size.
Example use cases
Unknown token address classification
“I've got this Base address 0x4200000000000000000000000000000000000006 and I don't know what it is — can you tell me whether it's a regular wallet, a fungible token, or an NFT contract, and give me its name and symbol?”
NFT vs fungible token disambiguation
“Before I list this Base contract 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9 as an NFT on my platform, can you confirm whether it actually declares ERC-721 or ERC-1155, or if it's just an ERC-20?”
Smart contract deployment verification
“We just deployed a contract to Base at 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA — can you verify it has bytecode on-chain and tell me its code size, name, and token standard?”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/contract-infoWhen to prefer
Use this endpoint when you need a definitive, nuanced classification of a Base address — it prioritizes ERC-165 self-declaration over naive ABI sniffing and correctly handles the NFT/ERC-20 totalSupply collision. Prefer it over generic block explorer lookups when you need structured, machine-readable token metadata including decimals and code size in a single call.
Side effects
- Invalid or malformed address returns an error
- Address not found or not deployed on Base returns empty/null contract info
- RPC timeout or Base node unavailability causes request failure
- Contracts with non-standard or missing metadata may return null for name/symbol/decimals
- Proxy contracts may misidentify underlying implementation standard
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
Reviews
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