> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uniblock.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Cronos zkEVM (CRO) Overview

Cronos zkEVM (CRO) RPC

Use Uniblock's JSON-RPC endpoint to access Cronos zkEVM (CRO) with low-latency routing and a single API surface across providers.

## What is Cronos zkEVM?

Cronos zkEVM is an EVM-compatible mainnet. Its ticker symbol is `CRO`.

## What is the Cronos zkEVM (CRO) JSON-RPC API?

The JSON-RPC API is the standard interface for reading chain state, sending transactions, and interacting with smart contracts where supported.

## Making API requests

Send a POST request to `https://api.uniblock.dev/uni/v1/json-rpc?chainId=388`. Include the JSON-RPC method and params in the request body.

## Supported networks

| Network      | Symbol | Type    | Chain ID |
| ------------ | ------ | ------- | -------- |
| Cronos zkEVM | `CRO`  | Mainnet | `388`    |

## API reference

Browse the available method groups for this chain:

* [EVM](/reference/jsonrpc-docs/388/evm/eth-accounts)