eth_getCode

Returns the bytecode at a given address.

When to Use This Method

Use eth_getCode to:

• Verify Contract Deployment - Check if contract exists
• Get Contract Bytecode - Retrieve deployed contract code
• Distinguish EOAs from Contracts - EOAs return 0x
• Contract Verification - Compare deployed vs expected bytecode
• Security Audits - Analyze deployed contract code

Parameters

1. Address - DATA, 20 Bytes

   • Address to get code from

2. Block Parameter - QUANTITY|TAG

   • latest, earliest, pending, or block number

{
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0x239e96c8f17C85c30100AC26F635Ea15f23E9c67",
    "latest"
  ],
  "id": 1
}

Returns

DATA - The bytecode from the given address.

Implementation Examples

JavaScript

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://api-zetachain-mainnet.n.dwellir.com/YOUR_API_KEY');

// Check if address is a contract
async function isContract(address) {
  const code = await provider.getCode(address);
  return code !== '0x';
}

// Get contract bytecode
const contractAddress = '0x239e96c8f17C85c30100AC26F635Ea15f23E9c67';
const bytecode = await provider.getCode(contractAddress);

if (bytecode !== '0x') {
  console.log('Contract found, bytecode length:', bytecode.length);
} else {
  console.log('No contract at this address (EOA)');
}

Python

from web3 import Web3

w3 = Web3(Web3.HTTPProvider('https://api-zetachain-mainnet.n.dwellir.com/YOUR_API_KEY'))

# Get contract code
address = '0x239e96c8f17C85c30100AC26F635Ea15f23E9c67'
code = w3.eth.get_code(address)

if code != b'':
    print(f'Contract bytecode: {code.hex()}')
else:
    print('Address is an EOA (not a contract)')

Related Methods

• eth_getStorageAt - Read contract storage
• eth_call - Execute contract function