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LogicNodes EVM Contract Type Detector
x402
LogicNodes EVM Contract Type Detector is a paid API for AI agents from logicnodes.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-28).
Identifies the type/classification of a smart contract at a given EVM address and block height
Price / call$0.003
Success—
StatusUnknown
How this service works
Exact answers for AI agents: 40+ tools for EVM chains and Aptos, gas on 14 chains, never a guess. Free tier; pay per call in USDC (x402) on 13 networks.
Output
A JSON object with an 'ok' boolean and a 'tool' field confirming the tool used, plus the detected contract type/classification for the given address at the specified block on the specified EVM chain.
Example use cases
Token contract verification before swap
“Before I approve this token swap, can you check what type of contract 0xdAC17F958D2ee523a2206206994597C13D831ec7 is on Ethereum (eip155:1) at the latest block? I want to confirm it's actually an ERC-20 token.”
NFT contract classification for marketplace
“I need to know whether the contract at 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum mainnet (eip155:1) is an ERC-721 or ERC-1155 NFT — check at the finalized block.”
Proxy contract detection for security audit
“Can you tell me what kind of contract is at 0x1F98431c8aD98523631AE4a59f267346ea31F984 on Arbitrum (eip155:42161) at block 150000000? I'm trying to find out if it's a proxy or an implementation contract.”
Technical details
Endpoint
POSThttps://logicnodes.io/paid/v1/tools/evm_contract_type?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a definitive, on-chain classification of a smart contract type on an EVM-compatible chain, especially when accuracy matters for downstream logic (e.g. before executing a transaction, auditing a contract, or routing DeFi operations). Prefer LogicNodes over RPC self-inspection when you want a structured, AI-friendly answer rather than raw bytecode analysis. Particularly useful when you need historical contract classification at a specific block.
Side effects
- Invalid or non-checksummed mixed-case address returns an error
- Chain name (e.g. 'ethereum') instead of CAIP-2 ID or numeric chain ID is refused
- Address is an EOA (externally owned account) with no contract code
- Unsupported chain ID returns an error
- Payment failure via x402 protocol causes request rejection
- Block number beyond chain tip returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| block | string | "latest" (default), "safe", "finalized", or a decimal block number. Every value in the answer is read at this one block |
| chain | string | EVM CAIP-2 chain id such as eip155:8453, or a bare chain id number as a string. Chain names are refused. |
| address | string | 0x + 40 hex digits (EIP-55 checksum enforced when mixed-case) |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "evm_contract_type"
}
}Tags
x402
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