To calculate the crypto commission example if you opened a BTCUSD trade:
Open trade at 6067.89 and close trade at 7013.78= Total profit $945.89
Open price 6067.89 * 0.075%=$4.55
Close Price 7013.78*0.075%=$5.26
Total commission charged =$9.81
Remember our spreads on Crypto are raw so there is no markup, the only spread is the market spread.