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EVM Chain Read – Is-Contract Check (x402)
x402
EVM Chain Read – Is-Contract Check (x402) is a paid API for AI agents from chain-read.frcompanycheck.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Returns the deployed bytecode size and a boolean indicating whether the given address is a smart contract on Base or Robinhood Chain, paid per-call via x402 USDC.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call EVM reads on Base (8453) and Robinhood Chain (4663): native balance, block tip, ERC-20 meta/balance/allowance, is-contract. Public RPCs, no API key. x402 USDC on Base.
Output
A JSON object containing `code_bytes` (integer: length of deployed bytecode at the address) and `is_contract` (boolean: true if bytecode length > 0, meaning a smart contract is deployed there). Returns is_contract: false and code_bytes: 0 for externally owned accounts (EOAs).
Example use cases
Validate token contract before swap
“Before I swap into this token, can you verify that 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Base is actually a deployed contract and not just a wallet address?”
Detect contract wallets in airdrop list
“I have a list of addresses I'm about to airdrop to on Base — can you check if 0x1234567890abcdef1234567890abcdef12345678 is a smart contract so I know whether to expect a contract wallet or an EOA?”
Audit suspicious address on Robinhood Chain
“Someone sent funds from 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef on Robinhood Chain — can you tell me if that address has any bytecode deployed, i.e. is it a contract?”
Technical details
Endpoint
GEThttps://chain-read.frcompanycheck.workers.dev/v1/%7Bchain%7D/code/%7Baddress%7D?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call check to determine whether an address has deployed code on Base or Robinhood Chain — no API key required, costs only $0.002 USDC per call. Prefer it over full-node RPC calls when you lack direct RPC access, or over general-purpose block explorers when you need a programmatic, low-latency boolean result rather than a full explorer page.
Side effects
- Invalid or malformed EVM address returns an error response
- Unsupported chain ID (not 8453 or 4663) returns an error
- Payment failure or insufficient USDC balance blocks the call with a 402 response
- RPC node unavailability may cause timeouts or 503 errors
- Freshly deployed contracts may not yet be indexed depending on block finality
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"code_bytes": 5000,
"is_contract": true
}
}Tags
x402
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