The quickest way to start building on zkSync with QuickNode is by sending a JSON-RPC request to your endpoint. In this quickstart, you’ll create an endpoint, copy its provider URL, and make your first request. Code samples are available in cURL as well as popular SDKs and programming languages.

Get Your zkSync Endpoint

1

Create a QuickNode account

Sign up here if you haven't already.

2

Go to your dashboard

Open the Endpoints dashboard from the left sidebar menu to manage all your blockchain endpoints

3

Create a new endpoint

Click Create an Endpoint in the top-right corner, select zkSync as your blockchain, then select your preferred network

4

Copy your provider URLs

Keep the HTTP URL handy. You'll use it in your requests below.

Learn More about the Dashboard

For a detailed walkthrough of the QuickNode dashboard, check out our guide

Send Your First Request

Your endpoint is ready. Now, let's make your first call to the zkSync blockchain. We’ll use the eth_blockNumber method, which returns the latest block number. Select your preferred language or SDK and follow the steps below to send your first request.

cURL

1

Check cURL installation

Most *nix based systems have cURL support out of the box. Open your terminal and check the cURL version by running the command below:

curl --version

2

Send a JSON-RPC request

In your terminal, copy and paste the following cURL command to retrieve the latest block number:

curl -X POST YOUR_QUICKNODE_ENDPOINT_URL \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

3

Sample Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x1234567"
}

QuickNode SDK

1

Set up your project

First, verify Node.js is installed with node --version. If not installed, download it from https://nodejs.org. Then create a new directory and initialize a Node.js project:

mkdir zkSync-api-quickstart
cd zkSync-api-quickstart
npm init -y

2

Install the QuickNode SDK

Install the QuickNode SDK package:

npm install @quicknode/sdk

3

Create your main file

Create an index.js file for your code:

touch index.js

4

Add this code to your index.js file

Copy and paste this code into your index.js file:

const { Core } = require('@quicknode/sdk');

const main = async () => {
  const core = new Core({
    endpointUrl: 'YOUR_QUICKNODE_ENDPOINT_URL',
  });

  const blockNumber = await core.client.request({
    method: 'eth_blockNumber',
  });

  console.log('Block number:', parseInt(blockNumber, 16));
};

main();

5

Run your project

Execute your script to see the latest block number:

node index.js

Python

1

Set up your project

Create a new directory for your Python project:

mkdir zkSync-python-quickstart
cd zkSync-python-quickstart

2

Create and activate a virtual environment

Create a virtual environment to manage dependencies:

python3 -m venv venv
source venv/bin/activate

3

Install requests

Install the requests library for making HTTP requests:

pip install requests

4

Create a Python script (app.py)

Create a Python file with the following code:

import requests
import json

# Your QuickNode endpoint URL
endpoint_url = "YOUR_QUICKNODE_ENDPOINT_URL"

# JSON-RPC request payload
payload = {
    "jsonrpc": "2.0",
    "id": 1,
    "method": "eth_blockNumber",
    "params": []
}

# Make the request
response = requests.post(endpoint_url, json=payload)
result = response.json()

print("Latest block number (hex):", result["result"])
print("Latest block number (decimal):", int(result["result"], 16))

5

Run the script

Execute your Python script:

python app.py

JavaScript

1

Set up your project

Create a new directory and initialize a Node.js project:

mkdir zkSync-js-quickstart
cd zkSync-js-quickstart
npm init -y

2

Create a JavaScript file (app.js)

Create an app.js file with the following code (using native fetch available in Node.js 18+):

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

async function main() {
  try {
    const response = await fetch(url, options);
    const data = await response.json();
    console.log('Block Number (hex):', data.result);
    console.log('Block Number (decimal):', parseInt(data.result, 16));
  } catch (error) {
    console.error('Error:', error);
  }
}

main();

3

Run the script

Execute your JavaScript script:

node app.js

Ruby

1

Set up your project

Create a new directory for your Ruby project:

mkdir zkSync-ruby-quickstart
cd zkSync-ruby-quickstart

2

Check Ruby installation

Verify Ruby is installed on your system. If not, install it from https://ruby-lang.org:

ruby --version

3

Create a Ruby script (main.rb)

Create a main.rb file with the following code:

require "uri"
require "json"
require "net/http"

url = URI("YOUR_QUICKNODE_ENDPOINT_URL")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = "application/json"
request.body = JSON.dump({
  "method": "eth_blockNumber",
  "params": [],
  "id": 1,
  "jsonrpc": "2.0"
})

response = https.request(request)
result = JSON.parse(response.read_body)
hex_result = result["result"]
decimal_result = hex_result.to_i(16)
puts "Block number (hex): #{hex_result}"
puts "Block number (decimal): #{decimal_result}"

4

Run the script

Execute your Ruby script to see the latest block number:

ruby main.rb

Go

1

Set up your project

Create a new directory for your Go project:

mkdir zkSync-go-quickstart
cd zkSync-go-quickstart

2

Check Go installation

Verify Go is installed on your system. If not, install it from https://golang.org:

go version

3

Create a Go script (main.go)

Create a main.go file with the following code:

package main

import (
  "encoding/json"
  "fmt"
  "strings"
  "net/http"
  "io/ioutil"
  "strconv"
)

type Response struct {
  Result string `json:"result"`
}

func main() {
  url := "YOUR_QUICKNODE_ENDPOINT_URL"
  method := "POST"

  payload := strings.NewReader(`{"method":"eth_blockNumber","params":[],"id":1,"jsonrpc":"2.0"}`)

  client := &http.Client{}
  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
    return
  }
  req.Header.Add("Content-Type", "application/json")

  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }

  var response Response
  err = json.Unmarshal(body, &response)
  if err != nil {
    fmt.Println("Error parsing JSON:", err)
    return
  }

  // Convert hex to decimal
  blockNumber, err := strconv.ParseInt(response.Result, 0, 64)
  if err != nil {
    fmt.Println("Error converting hex to decimal:", err)
    return
  }

  fmt.Printf("Block number (hex): %s\n", response.Result)
  fmt.Printf("Block number (decimal): %d\n", blockNumber)
}

4

Run the script

Execute your Go script to see the latest block number:

go run main.go

Ethers.js

1

Set up your project

Create a new directory and initialize a Node.js project (assumes Node.js is already installed):

mkdir zkSync-ethers-quickstart
cd zkSync-ethers-quickstart
npm init -y
npm pkg set type=module

2

Install ethers.js

Install the ethers.js library for Ethereum interaction:

npm install ethers

3

Create your main file (index.js)

Create an index.js file with the following code:

import { ethers } from "ethers";

(async () => {
  const provider = new ethers.JsonRpcProvider("YOUR_QUICKNODE_ENDPOINT_URL");
  const blockNum = await provider.getBlockNumber();
  console.log('Current block number (decimal):', blockNum);
  console.log('Block number (hex):', '0x' + blockNum.toString(16));
})();

4

Run your project

Execute your script to see the latest block number:

node index.js

Web3.py

1

Set up your project

Create a new directory for your web3.py project:

mkdir zkSync-web3py-quickstart
cd zkSync-web3py-quickstart

2

Install web3.py (if not already installed)

Check if web3.py is installed with `pip list | grep web3`. If not found, install it:

pip install web3

3

Create a Python script (main.py)

Create a main.py file with the following code:

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("YOUR_QUICKNODE_ENDPOINT_URL"))

try:
  latest_block_number = w3.eth.block_number
  print(f"Latest Block Number: {latest_block_number}")
  print(f"Block number (hex): {hex(latest_block_number)}")
except Exception as e:
  print(f"Error: {e}")

Eth.rb

1

Set up your project

Create a new directory for your eth.rb project:

mkdir zkSync-ethrb-quickstart
cd zkSync-ethrb-quickstart

2

Install eth.rb (if not already installed)

Check if eth.rb is installed with `gem list eth`. If not found, install it:

gem install eth

3

Create a Ruby script (main.rb)

Create a main.rb file with the following code:

require 'eth'

client = Eth::Client.create "YOUR_QUICKNODE_ENDPOINT_URL"

begin
  block_number = client.eth_block_number
  hex_result = block_number["result"]
  decimal_result = hex_result.to_i(16)
  puts "Block number (hex): #{hex_result}"
  puts "Block number (decimal): #{decimal_result}"
rescue => e
  puts "Error: #{e.message}"
end

4

Run the script

Execute your Ruby script to see the latest block number:

ruby main.rb

Ethgo

1

Set up your project

Create a new directory for your Ethgo project:

mkdir zkSync-ethgo-quickstart
cd zkSync-ethgo-quickstart

2

Initialize Go module and install ethgo

Initialize a go.mod file to track dependencies, then install the ethgo SDK:

go mod init zkSync-ethgo-quickstart
go get github.com/umbracle/ethgo
go mod tidy

3

Create a Go script (main.go)

Create a main.go file with the following code:

package main

import (
  "fmt"
  "log"
  "github.com/umbracle/ethgo/jsonrpc"
)

func main() {
  client, err := jsonrpc.NewClient("YOUR_QUICKNODE_ENDPOINT_URL")
  if err != nil {
    log.Fatalf("Failed to connect to Ethereum: %v", err)
  }

  blockNumber, err := client.Eth().BlockNumber()
  if err != nil {
    log.Fatalf("Failed to get latest block number: %v", err)
  }

  fmt.Printf("Latest block number (decimal): %d\n", blockNumber)
  fmt.Printf("Latest block number (hex): 0x%x\n", blockNumber)
}

4

Run the script

Execute your Go script to see the latest block number:

go run main.go

If you want to continue learning about making API requests, check out our guides and sample apps.

API Overview

Discover supported zkSync APIs, networks and their chain configurations

Provider Endpoints

Learn how to set up and configure your zkSync RPC endpoints for development and production use

Endpoint Security

Secure your endpoints with authentication, whitelisting, and best security practices.

Error Reference

Reference guide for common zkSync RPC error codes and troubleshooting tips

Marketplace Add-ons

Discover powerful add-ons and extensions to enhance your zkSync development workflow

Guides

Explore comprehensive zkSync development guides, tutorials, and best practices to accelerate your blockchain application development

We ❤️ Feedback!

If you have any feedback or questions about this documentation, let us know. We'd love to hear from you!