Most Crypto Exchanges have their own Coin and they give a discount if you use their Coin to pay for Fees. Exchanges like Binance will charge you in BNB and others like Kucoin will charge you in USD from your KCS. Since there are two methods of counting fee I choose to follow Binance to do it automatically.
Exchanges that show the fee in coin shares
If you are using the EXC to pay for fees you need to check the column “For Fee”.
Then every time you trade you need to fill the cell called “Fee Crypto”.
The calculation of fee is automatic and your ammount of the EXC will change.
Exchanges that show the fee in fiat
If you are using the EXC to pay for fees you need to check the column “For Fee”. Then every time you trade you need to fill the cell called “USD Fee”.
You will also have to do a manual calculation of fee. Check at your exchange the shares of its coin. Ex.: if you are use Kucoin check KCS shares after a trade, it will be changed. Then go to the table USD Fees Calculation above and enter the results of: Initial Shares (from KCS) and the current shares (the number you found at Exchange). The amount of KCS will be automatically updated.