# JSON-RPC API Overview

## Overview

Welcome to Cronos zkEVM JSON-RPC API reference documentation. This page provides a comprehensive overview of our API capabilities and key information. We support the standard [Ethereum JSON-RPC API](https://ethereum.org/en/developers/docs/apis/json-rpc/) while also offering Layer 2-specific features to enhance functionality.

To ensure a seamless experience, we impose rate limits on both JSON-RPC and WebSocket APIs. Rate limits will change over time.

### Mainnet <a href="#mainnet" id="mainnet"></a>

* Network Name: Cronos zkEVM Mainnet
* RPC URL: `https://mainnet.zkevm.cronos.org/`
* Chain ID: `388`
* Currency Symbol: zkCRO
* Block Explorer URL: `https://explorer.zkevm.cronos.org/`
* WebSocket (rate limited): `wss://ws.zkevm.cronos.org`

### Testnet <a href="#testnet" id="testnet"></a>

* Network Name: Cronos zkEVM Testnet
* RPC URL: `https://testnet.zkevm.cronos.org`
* Chain ID: `240`
* Currency Symbol: zkTCRO
* Block Explorer URL: `https://explorer.zkevm.cronos.org/testnet/`
* WebSocket (rate limited): `wss://ws.testnet.zkevm.cronos.org`

### Commercial infrastructure providers

* **Getblock:**
  * [Visit Getblock to obtain your API key](https://getblock.io/)

### API Collections <a href="#api-collections" id="api-collections"></a>

Explore our curated API endpoint collections to meet a range of needs from seamless Ethereum integrations to advanced ZK integrations. Unlock the full potential of Cronos zkEVM to elevate your dApps. Discover, integrate, and innovate with our powerful API offerings.

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