zkSync RPC

With QuickNode, you get access to our global zkSync network which always routes your API requests to the nearest available location, ensuring low latency and the fastest speeds.

Try free

What is zkSync?

zkSync Era is a zero-knowledge rollup (zkRollup) Layer 2 solution for Ethereum developed by Matter Labs. It uses SNARK-based cryptographic proofs to batch transactions off-chain and verify them on Ethereum mainnet, ensuring all transactions are mathematically valid while inheriting Ethereum's security.

Unlike optimistic rollups, zkSync does not require challenge periods for withdrawals because validity proofs provide immediate cryptographic certainty. This enables faster finality compared to optimistic rollups and significantly reduces transaction costs relative to Ethereum mainnet.

zkSync Era uses a zkEVM architecture, allowing Solidity smart contracts to be compiled into zkSync-compatible bytecode. The system was designed to eventually support zkPorter, a hybrid data-availability solution that could lower costs further by storing some data off-chain. However, zkPorter is not currently available on mainnet.

Interacting with zkSync

zkSync extends the standard Ethereum JSON-RPC interface with Layer 2–specific functionality, while maintaining broad compatibility with Ethereum tooling. Developers can use zkSync Era with common tools like MetaMask, Hardhat, Foundry, and Web3 libraries with minimal changes.

With this API, you can:

Execute standard Ethereum JSON-RPC methods (eth_call, eth_sendTransaction, eth_getBalance)
Access zkSync-specific methods for Layer 2 operations (e.g., zks_estimateFee, zks_getMainContract)
Query bridge operations and batch information
Subscribe to real-time events via WebSocket connections

You can connect to the API by:

Running a local zkSync Era node
Using a hosted provider such as a QuickNode zkSync endpoint, which provides access to zkSync Era Mainnet and Sepolia testnet with high reliability, archive data, and enhanced performance

Supported Networks

QuickNode provides access to the following zkSync networks:

Mainnet

Type:Production

Chain ID:

324

HTTP:

WSS:

Archive:Yes

Pruning:None

Sepolia

Type:Testnet

Chain ID:

300

HTTP:

WSS:

Archive:Yes

Pruning:None

Network

Type

Chain ID

HTTP

WSS

QuickStart

Get started with zkSync quickly. Follow our step-by-step quickstart to set up your endpoint and make your first API request.

Provider Endpoints

Learn how to configure and manage your zkSync endpoints for optimal performance and reliability.

API Overview

Explore supported APIs, networks, QuickNode products, and enhanced API features for building powerful applications.

Marketplace

Discover and integrate powerful add-ons and tools from the QuickNode Marketplace to enhance your web3 applications.

Endpoint Security

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

Error Codes

Understand common error codes and troubleshooting steps for zkSync API requests.