# Classic StableSwap

The Classic StableSwap is an implementation of Curve Finance’s AMM on PancakeSwap. It adds linear invariant constant sum curve (x+y=k) on top of the constant product formula (x\*y=k) to keep prices more equal as long as the liquidity pool is not extremely unbalanced. As a result, since StableSwaps are restricted to similarly priced assets, impermanent loss is not as much of a concern (except in extreme depeg cases) and the slippage is lower than normal AMM which just uses the constant product formula.

When you conduct a Swap (trade) on the StableSwap you will pay lower trading fees, than the usual 0.25% on normal PancakeSwap AMM. The fee attribution is broken down as follows:

* 50% to the LP as rewards 
* 40% to CAKE buyback and burn 
* 10% to the PancakeSwap Treasury

## Stableswap Fees

Fees for pairs are broken down in the table below:

<table><thead><tr><th width="150">Stablepair</th><th width="132">Trading Fees</th><th width="118.33333333333331">LP Rewards</th><th width="124">CAKE Buyback</th><th>PancakeSwap Treasury</th></tr></thead><tbody><tr><td>USDT-BUSD</td><td>0.01%</td><td>0.005%</td><td>0.004%</td><td>0.001%</td></tr><tr><td>USDC-BUSD</td><td>0.01%</td><td>0.005%</td><td>0.004%</td><td>0.001%</td></tr><tr><td>USDC-USDT</td><td>0.01%</td><td>0.005%</td><td>0.004%</td><td>0.001%</td></tr><tr><td>HAY-BUSD</td><td>0.04%</td><td>0.02%</td><td>0.016%</td><td>0.004%</td></tr><tr><td>HAY-USDT</td><td>0.04%</td><td>0.02%</td><td>0.016%</td><td>0.004%</td></tr><tr><td>axlUSDC-USDT</td><td>0.04%</td><td>0.02%</td><td>0.016%</td><td>0.004%</td></tr><tr><td>BNBx-WBNB</td><td>0.04%</td><td>0.02%</td><td>0.016%</td><td>0.004%</td></tr><tr><td>stkBNB-WBNB</td><td>0.04%</td><td>0.02%</td><td>0.016%</td><td>0.004%</td></tr></tbody></table>

The Kitchen will gradually roll out StableSwap pairs and revise the fees to test and improve the product further.

## Why should I use the StableSwap instead of the normal AMM Swap?

* Swap your stablecoins or other pairs with similar asset prices more efficiently with the same trade steps&#x20;
* With the StableSwap function, the trading slippage is lower than normal AMM&#x20;
* The StableSwap trading fees are lower compared to the normal AMM