# Trading Fee Rates

#### BR= Base Rate

| Index                  | Base Rate |
| ---------------------- | --------- |
| BTC                    | 0.05%     |
| ETH                    | 0.05%     |
| USDT                   | 0.05%     |
| MAV(Maverick Protocol) | 0.08%     |
| Cheems                 | 0.15%     |
| VELA                   | 0.15%     |
| ARB                    | 0.1%      |
| GMX                    | 0.1%      |

any trading activity that increases Math.max(LOI/SOI, SOI/LOI) will incur a higher fee rate, similar to funding fee rate, the purpose of this mechanism is to balance the longs and shorts for each trading pair, reducing the risk of draining insurance pool.

#### Trading(open long or close short) that increases long OI/short OI ratio: 

fee rate = max(BR, BR\* <mark style="color:green;">(long OI + yourOpenSize)/ short OI</mark>);

#### Trading(open short or close long) that increases short OI / long OI ratio:

&#x20;fee rate = max(BR, BR \* <mark style="color:red;">(short OI +</mark> <mark style="color:green;">yourOpenSize</mark><mark style="color:red;">) / long OI</mark>)

#### Detailed scenarios(BTC/ETH):

When ratio of long OI / short OI after opening a long position or closing a short position > 1, fee rate for opening long position =0.1% \* (long OI + OI Delta)/ short OI.

When ratio of long OI / short OI after opening a long position or closing a short position < 1, fee rate for opening long position =0.1%.

When ratio of short OI / long OI after opening a short position or closing a long position > 1, fee rate for opening short position = 0.1% \* (short OI + OI Delta) / long OI.

When ratio of short OI / long OI after opening a short position or closing a long position < 1, fee rate for opening short position = 0.1%.


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