eth_getCode

Returns the bytecode at a given address on zkSync Era.

Why zkSync? Build on Matter Labs' flagship zkEVM powering the Elastic Network of interoperable hyperchains with ZK Stack modular framework, hyperchain interoperability, native account abstraction, and $1.9B in tokenized real-world assets.

Use Cases

The eth_getCode method is essential for:

• Contract verification - Check if address is a contract
• Security analysis - Verify deployed bytecode matches expected
• DeFi integrations - Validate contracts before interactions
• Protocol analysis - Analyze contract deployments for RWA tokenization ($1.9B, 25% market share), hyperchain deployment via ZK Stack, and cross-chain DeFi

Parameters

Parameter	Type	Required	Description
address	DATA	Yes	20-byte address
blockParameter	QUANTITY|TAG	Yes	Block number or tag

Request

{
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
    "latest"
  ],
  "id": 1
}

Returns

Type	Description
DATA	Contract bytecode or 0x if EOA

Code Examples

cURL

curl -X POST https://api-zksync-era-mainnet-full.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": [
      "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
      "latest"
    ],
    "id": 1
  }'

JavaScript

import { JsonRpcProvider } from 'ethers';

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

const address = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb';
const code = await provider.getCode(address);

if (code === '0x') {
  console.log('Address is an EOA (externally owned account)');
} else {
  console.log('Address is a contract');
  console.log('Bytecode length:', code.length);
}

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

Python

from web3 import Web3

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

address = '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb'
code = w3.eth.get_code(address)

if code == b'':
    print('Address is an EOA')
else:
    print('Address is a contract')
    print(f'Bytecode length: {len(code.hex())}')

# Check if address is a contract
def is_contract(address):
    code = w3.eth.get_code(address)
    return code != b''

Go

package main

import (
    "context"
    "fmt"
    "log"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/ethclient"
)

func main() {
    client, err := ethclient.Dial("https://api-zksync-era-mainnet-full.n.dwellir.com/YOUR_API_KEY")
    if err != nil {
        log.Fatal(err)
    }

    address := common.HexToAddress("0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb")
    code, err := client.CodeAt(context.Background(), address, nil)
    if err != nil {
        log.Fatal(err)
    }

    if len(code) == 0 {
        fmt.Println("Address is an EOA")
    } else {
        fmt.Printf("Contract bytecode length: %d\n", len(code))
    }
}

Related Methods

• eth_getBalance - Get account balance
• eth_getStorageAt - Get contract storage