> ## 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.

# CrossFi Testnet (CFI) Overview

CrossFi Testnet (CFI) RPC

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

## What is CrossFi Testnet?

CrossFi Testnet is an EVM-compatible testnet. It is a testnet for CrossFi. Its ticker symbol is `CFI`.

## What is the CrossFi Testnet (CFI) 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=4157`. Include the JSON-RPC method and params in the request body.

## Supported networks

| Network         | Symbol | Type    | Chain ID |
| --------------- | ------ | ------- | -------- |
| CrossFi         | `XFI`  | Mainnet | `4158`   |
| CrossFi Testnet | `CFI`  | Testnet | `4157`   |

## API reference

Browse the available method groups for this chain:

* [Debug](/reference/jsonrpc/4157/debug/debug-trace-block-by-hash)
* [EVM](/reference/jsonrpc/4157/evm/eth-accounts)