> For the complete documentation index, see [llms.txt](https://docs.substancex.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.substancex.io/perpetual/fees/liquidity.md).

# Liquidity

### Withdrawal Fee

The withdrawal fee is based on the size of the liquidity withdrawn and is charged upon withdrawal.

1. Fee Calculation: Withdraw fee = Burn SLP Amount \* SLP Price \* Withdrawal Rate
   1. Withdrawal Rate = 0.1%.
   2. The fee will be collected at the end of each Epoch.
2. Collection Method: Deducted from the USDX obtained by the user from withdrawing liquidity.
3. Fee Collector: Vault.
4. No fee is charged for adding liquidity.