eth_getCode | Monad - Chainstack

eth_getCode

curl --request POST \
  --url https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12",
    "latest"
  ]
}
'

import requests

url = "https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/"

payload = {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": ["0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12", "latest"]
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    id: 1,
    jsonrpc: '2.0',
    method: 'eth_getCode',
    params: ['0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12', 'latest']
  })
};

fetch('https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'id' => 1,
    'jsonrpc' => '2.0',
    'method' => 'eth_getCode',
    'params' => [
        '0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12',
        'latest'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/"

	payload := strings.NewReader("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_getCode\",\n  \"params\": [\n    \"0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12\",\n    \"latest\"\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_getCode\",\n  \"params\": [\n    \"0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12\",\n    \"latest\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_getCode\",\n  \"params\": [\n    \"0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12\",\n    \"latest\"\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}

POST

eth_getCode

curl --request POST \
  --url https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_getCode",
  "params": [
    "0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12",
    "latest"
  ]
}
'

import requests

url = "https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/"

payload = {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": ["0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12", "latest"]
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    id: 1,
    jsonrpc: '2.0',
    method: 'eth_getCode',
    params: ['0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12', 'latest']
  })
};

fetch('https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'id' => 1,
    'jsonrpc' => '2.0',
    'method' => 'eth_getCode',
    'params' => [
        '0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12',
        'latest'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/"

	payload := strings.NewReader("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_getCode\",\n  \"params\": [\n    \"0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12\",\n    \"latest\"\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/")
  .header("Content-Type", "application/json")
  .body("{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_getCode\",\n  \"params\": [\n    \"0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12\",\n    \"latest\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://monad-testnet.core.chainstack.com/9c5b265f20b3ea5df4f54f70eb74b800/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"id\": 1,\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"eth_getCode\",\n  \"params\": [\n    \"0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12\",\n    \"latest\"\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}

Monad API method that returns the code at a given address. This is used to check if an address is a smart contract and retrieve its bytecode.

When called against a block older than the latest ~128 blocks, this method is treated as an archive request (2 RUs instead of 1 RU). See request units.

Get your own node endpoint todayStart for free and get your app to production levels immediately. No credit card required.You can sign up with your GitHub, X, Google, or Microsoft account.

Parameters

data — the 20-byte address.
quantity or tag — integer block number, or the string latest, earliest, or pending.

Response

result — the code from the given address. Returns 0x for externally owned accounts (EOAs).

`eth_getCode` code examples

const { ethers } = require("ethers");

const provider = new ethers.JsonRpcProvider("CHAINSTACK_NODE_URL");

async function getCode() {
  const address = "0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12";
  const code = await provider.getCode(address);

  if (code === "0x") {
    console.log("Address is an EOA (not a contract)");
  } else {
    console.log(`Contract bytecode: ${code}`);
  }
}

getCode();

from web3 import Web3

node_url = "CHAINSTACK_NODE_URL"

web3 = Web3(Web3.HTTPProvider(node_url))

address = "0xAc586b65F3cd0627D2D05AdB8EF551C9d2D76E12"
code = web3.eth.get_code(address)

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

Use case

A practical use case for eth_getCode is verifying whether an address is a smart contract before interacting with it, which helps prevent errors and potential security issues.

Body

application/json

integer

default:1

jsonrpc

string

default:2.0

method

string

default:eth_getCode

params

string[]

Response

200 - application/json

The bytecode at the given address.

jsonrpc

string

integer

result

string

Last modified on June 22, 2026

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Chainstack platform API

eth_getCode | Monad

Parameters

Response

`eth_getCode` code examples

Use case

Body

Response

​Parameters

​Response

​eth_getCode code examples

​Use case

Body

Response

Parameters

Response

`eth_getCode` code examples

Use case