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Plainchain Address Lookup
x402
Plainchain Address Lookup is a paid API for AI agents from plainchain.appin60.com, paid per call via x402, $0.001942/call, status unknown (last checked 2026-10-14).
Returns address type classification, ERC-20 token metadata, proxy details, and a human-readable summary for any EVM address on Base, Arbitrum, Ethereum, or Optimism
Price / call$0.001942
Success—
StatusUnknown
How this service works
Gas, balances, token data, address type, approvals, transaction decoding, x402 receipt verification and verifiable randomness on Base, Arbitrum, Ethereum and Optimism. No API key: pay $0.001-$0.01 per call in USDC on Base via x402.
Output
A JSON object containing the address string, chain name, address type (e.g. 'contract' or 'EOA'), ERC-20 metadata (symbol and decimals if applicable), proxy details (standard like EIP-1967, admin address, implementation address if applicable), and a plain-English summary sentence describing what the address is.
Example use cases
Identify unknown contract before interaction
“Before I approve this contract to spend my tokens, can you tell me what 0x2626664c2603336E57B271c5C0b26F421741e481 is on Arbitrum — is it a contract, is it a proxy, what does it do?”
Fetch token decimals for DeFi calculation
“I need to know the symbol and decimals for the token contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum so I can format the amounts correctly.”
Audit proxy implementation address
“What is the current implementation contract behind the upgradeable proxy at 0x4200000000000000000000000000000000000006 on Optimism, and which proxy standard does it use?”
Technical details
Endpoint
GEThttps://plainchain.appin60.com/v1/address?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, structured classification of any EVM address — whether it's an EOA, a token contract, or an upgradeable proxy — across Base, Arbitrum, Ethereum, and Optimism, without needing an API key. It is ideal for agents that need to enrich address metadata on the fly and can pay micro-fees in USDC via x402. Prefer alternatives if you need deep historical data, transaction history, or non-EVM chains.
Side effects
- Invalid address format (not matching ^0x[0-9a-fA-F]{40}$) returns an error
- Unsupported chain identifier returns an error
- Address is valid but has no on-chain data (e.g. undeployed contract) — type returned as EOA or empty
- Network congestion or RPC failures may cause transient errors
- Payment failure via x402 if insufficient USDC balance on Base
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "contract",
"chain": "Base",
"erc20": {
"symbol": "USDC",
"decimals": 6
},
"proxy": {
"admin": "0x3abd...",
"standard": "EIP-1967",
"implementation": "0x2ce6..."
},
"address": "0x8335...",
"summary": "ERC-20 token USDC; upgradeable proxy (EIP-1967) -> 0x2ce6..."
}
}Tags
x402
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