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Base Mainnet Contract Code Check
x402
Base Mainnet Contract Code Check is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Checks a Base mainnet address to determine if it is a contract, returns bytecode size, and detects EIP-7702 delegated EOA status.
Price / call$0.001
Success—
StatusUnknown
How this service works
Contract-code check for a Base mainnet address (is_contract + code size + EIP-7702 delegated-EOA detection).
Output
Returns a JSON object indicating whether the address is a contract (is_contract boolean), the bytecode size in bytes, and whether the address is an EIP-7702 delegated EOA, all scoped to Base mainnet.
Example use cases
Example prompt
“Can you check if 0x1234567890abcdef1234567890abcdef12345678 is a smart contract or a regular wallet on Base mainnet, and tell me if it's EIP-7702 delegated?”
Technical details
Endpoint
GEThttps://x402-data-api.sigrunner.workers.dev/chain/codeWhen to prefer
Use this endpoint when you need to quickly classify a Base mainnet address as a smart contract vs EOA, retrieve its deployed bytecode size, or specifically detect EIP-7702 delegated account status — particularly useful for DeFi onboarding flows, wallet profiling, or security screening pipelines where contract vs wallet distinction matters.
Side effects
- Invalid or missing address parameter returns an error
- Non-0x-prefixed address may fail validation
- Undeployed or zero-code addresses return is_contract: false with code size 0
- Network or RPC errors may cause transient failures
- Payment not completed returns 402 status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"address": "0x4200000000000000000000000000000000000006",
"is_contract": true,
"code_size_bytes": 6234,
"delegate_address": null,
"is_eip7702_delegate": false
}
}Tags
x402
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