For every executed order, there is a Trading Fee incurred.
Note that the actual order cost will be reserved for open taker (0.07%) and maker(0.02%) transaction fee; however, the actual transaction fee will be paid when the order is executed and calculated based on the actual transaction price. When all orders are completed, if there is still remaining after deducting the actual fees for, it will be automatically returned to the available assets.
Who provide liquidity and increase the market depth of order book is called Market Makers,and who seek liquidity and take liquidity off the book immediately is called Market Takers .All of them will be charged a trading fee.
Inverse Perpetual Contract
The formula for Inverse Contract:
Trading Fee = contract face value x Trading Fee Rate
Order value = contract face value * contract size / Order Price
Trader A buys 100 BTCUSD contracts using Market order. （1 contract face value=100USD）
Trader B sells 100 BTCUSD contracts using Limit order. （1 contract face value=100USD）
Assuming that the execution price is 8,000 USD:
Taker fee for Trader A = 100*100/8,000 x 0.07% = 0.000875 BTC
Maker rebate for Trader B = 100*100/8,000 x 0.02% = 0.00025 BTC
Hence, upon execution, Trader A will be paying 0.000875 BTC of Taker fee and Trader B will be paying 0.00025 BTC .