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unprice Contract Info Lookup (Base)
x402
unprice Contract Info Lookup (Base) is a paid API for AI agents from volkov.evgeny.m2.fvds.ru, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).
Looks up whether an Ethereum address on Base is a smart contract and returns basic bytecode metadata, paid per-request via USDC on Base using the x402 protocol.
Price / call$0.002
Success—
StatusUnknown
How this service works
Tiny paid web services for agents. Pay per request with USDC on Base via x402, plus non-x402 Base USDC tx-hash checkouts for Merchant Feed Audit, Base USDC receipts, and recent wallet statements.
Output
Returns a JSON object with the queried address, the network name ('base'), a boolean isContract field indicating whether deployed bytecode exists at that address, and the bytecode size in bytes.
Example use cases
Verify smart contract before interaction
“Before I send funds, can you check if 0x4200000000000000000000000000000000000006 is actually a smart contract on Base, or just a regular wallet?”
Audit unknown address type
“I found this address 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD in a transaction — can you tell me if it's a deployed contract on Base and roughly how large its bytecode is?”
DApp integration check
“We're integrating with a new protocol on Base — can you verify that 0x2626664c2603336E57B271c5C0b26F421741e481 is a real smart contract and not an EOA before we wire it into our app?”
Technical details
Endpoint
GEThttps://volkov.evgeny.m2.fvds.ru/pay/contract?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cheap, pay-per-use check of whether a Base network address is a smart contract without setting up your own RPC node or paying for a premium blockchain API subscription. Ideal for low-volume, on-demand contract verification tasks within AI agent workflows that already use x402/USDC micropayment infrastructure.
Side effects
- Invalid or malformed Ethereum address returns an error or empty result
- Address not found on Base (e.g. typo) may return isContract: false with zero bytecode
- Payment failure via x402 results in HTTP 402 and the request is not fulfilled
- Network timeouts if Base RPC is slow or unavailable
- Missing required 'address' query parameter causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"network": "base",
"isContract": true,
"bytecodeBytes": 1
}
}Tags
x402
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