# Swap **Swap Engine**

Cellana uses a different swap algorithm depending on how assets are correlated to one another. The hybrid swap engine is as following: vAMM – Cellana follows Curve swap algorithm to provide services for assets with low price correlation. sAMM – Cellana uses the Solidly stable-swap algorithm for highly correlated assets. ## Swap Fees Cellana introduces a fully adaptive fee structure, where trading fees are dynamically adjusted in response to market volatility with min/max values of 0% and 10%, respectively. By default all V2 volatile pools are set to **0.1%** and stable pools to **0.04%**. ## Volatile Pools Volatile pools are defined as assets that have no direct correlation in price. For example, CELL/APT is referred as volatile pool since the price of CELL has no relationship to the volatility of APT. Volatile pairs use the following formula to determine the price: x × y ≥ k

## Stable Pools Stable pools are defined as assets that have a direct correlation to each other. Examples are USDC/USDT. The price of the 2 assets will trade very close to each other and thus a different approach can be taken to allow for much higher volume at low slippage. Stable pairs use the following formula to determine the price: x³y + y³x ≥ k