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Chain Code Size & Contract Detection
x402
Chain Code Size & Contract Detection is a paid API for AI agents from store.agentexchange.work, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Checks whether an Ethereum-compatible address is a smart contract by returning its on-chain bytecode size across multiple EVM networks
Price / call$0.001
Success—
StatusUnknown
How this service works
Is an address a smart contract or a regular wallet (EOA)? Returns whether deployed bytecode exists and its size via eth_getCode, across Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis. The safety/identity read wallet, payment and trading agents make before interacting with an address. Live public RPC; one paid call at $0.001.
Output
Returns a JSON object with the queried chain name, the address, the bytecode code_size in bytes (0 means no code = EOA), and a boolean is_contract field indicating whether deployed contract code exists at that address.
Example use cases
Example prompt
“Can you check if 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9 is a smart contract on Ethereum mainnet, and tell me its code size?”
Technical details
Endpoint
GEThttps://store.agentexchange.work/chain/code?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically distinguish smart contract addresses from externally owned accounts (EOAs) on EVM chains, especially in a pay-per-call, no-signup context via x402. Prefer this over full blockchain explorers when you only need contract/EOA classification and bytecode size, not full ABI or source code. Ideal for agents doing on-chain due diligence, routing logic, or pre-flight checks before interacting with an address.
Side effects
- Invalid or malformed address (non-0x format) returns an error
- Unsupported chain name returns an error — must be one of base, ethereum, optimism, arbitrum, polygon, gnosis
- Payment failure (insufficient USDC balance or x402 protocol error) results in 402 response
- Network RPC timeout for the target chain may cause delayed or failed response
- Address with no code returns is_contract: false and code_size: 0 (not an error, but may be misinterpreted)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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Zero review prompt (fires after every successful call)
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