> ## 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.

# Katana Testnet (ETH) Overview

Katana Testnet (ETH) RPC

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

## What is Katana Testnet?

Katana Testnet is an EVM-compatible testnet. It is a testnet for Katana. Its ticker symbol is `ETH`.

## What is the Katana Testnet (ETH) 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=737373`. Include the JSON-RPC method and params in the request body.

## Supported networks

| Network        | Symbol | Type    | Chain ID |
| -------------- | ------ | ------- | -------- |
| Katana         | `ETH`  | Mainnet | `747474` |
| Katana Testnet | `ETH`  | Testnet | `737373` |

## API reference

Browse the available method groups for this chain:

* [Debug](/reference/jsonrpc-docs/737373/debug/debug-get-raw-header)
* [EVM](/reference/jsonrpc-docs/737373/evm/eth-blob-base-fee)