ZKsync RPC Endpoints & API | OnFinality

ZKsync RPC Endpoints

ZKsync is an Ethereum Layer 2 scaling solution that uses zero-knowledge rollups (ZK-rollups) to provide high throughput, low transaction costs, and full EVM compatibility. As an elastic network, ZKsync enables developers to build scalable dApps, DeFi protocols, wallets, and analytics tools with the security of Ethereum.

Why Use ZKsync RPC?

Developers connect to ZKsync via JSON-RPC endpoints to read blockchain data, submit transactions, and interact with smart contracts. Common use cases include:

• dApps and wallets: Enable users to send transactions and query balances.
• DeFi products: Monitor liquidity pools, execute swaps, and fetch price data.
• Analytics tools: Retrieve historical data for dashboards and reporting.
• Bots and backend services: Automate on-chain interactions and index events.

ZKsync RPC on OnFinality

OnFinality provides managed API endpoints for ZKsync mainnet, supporting both HTTP and WebSocket transports. Our infrastructure is designed for production workloads, offering:

• Archive access: Query historical state and past blocks for deep analytics.
• Reliable connectivity: Redundant nodes and global points of presence.
• Usage analytics: Monitor request volume, errors, and latency through the OnFinality dashboard.

How to Connect

1. Create or sign in to your OnFinality account.
2. Select ZKsync from the supported networks list.
3. Create an API endpoint (shared or dedicated).
4. Test your endpoint with eth_blockNumber.
5. Monitor usage and move critical traffic to production.

Public vs. Authenticated RPC

Public ZKsync RPC endpoints are suitable for lightweight testing but often lack rate-limit transparency and reliability guarantees. OnFinality's authenticated endpoints provide clearer limits, request visibility, and a path to higher-capacity plans or dedicated nodes.

Key Facts

• Network: ZKsync Mainnet (Chain ID: 324)
• Protocol: EVM JSON-RPC
• Transports: HTTP and WebSocket
• Advanced access: Archive support available
• Common users: Production dApps, DeFi, analytics, wallets, bots

Get Started

Ready to build on ZKsync? Create an OnFinality account and get your API key in minutes.