# Tokens on Ferro

![](/files/EptLuu59kA4HyvQuY7ww)

## Supported Tokens

Ferro runs on the Cronos blockchain, which supports two types of tokens:

1. **Native CRO tokens for transaction fees**
   * You will need CRO tokens to pay all the transaction fees (gas) on Ferro and other applications in the Cronos ecosystem
2. **CRC-20 tokens for trading and forming pool pairs**
   * CRC-20 is a token protocol closely resembling Ethereum's ERC-20 for interoperability
   * Except for Native CRO, all other tokens are CRC-20 tokens
   * Tokens native to other blockchains are wrapped into CRC-20 tokens (eg. WBTC, USDC, ETH) to be operable on the Cronos blockchain
   * Both $FER and $xFER in our protocol are CRC-20 tokens

## Liquidity Pool Pairs Involving CRO

Liquidity Pool Pairs need to be formed by 2 or more CRC-20 tokens. 

Some liquidity pool pairs may involve CRO, such as our LCRO-CRO pool in collaboration with Veno Finance. In this case, users will still be able to interact with the pool using CRO directly, as our protocol will wrap to WCRO/unwrap from WCRO for our users:

* **Add liquidity**: The deposited CRO will be wrapped into WCRO and added to the pool.
* **Remove liquidity**: WCRO will be withdrawn from the pool and unwrapped into CRO before depositing in your wallet
* **Swap**: Swapping between LCRO and CRO will involve wrapping/unwrapping before the swapping is executed.


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