To calculate the crypto commission example if you opened a BTCUSD trade:
Commission rate in all account types for all Crypto currency symbols is 0.075% or 0.00075
Let’s take for example a trade with entry price 57046.23
Trade volume is 0.05 lot of BTCUSD.
1 lot for BTCUSD is 1 BTC and the total volume is 0.05 BTC.
Notional volume of the trade is volume times price or 0.05 * 57046.23 = 2852.31 USD
Commission amount is calculated as commission rate time notional volume or 0.00075 * 2852.31 = 2.14 USD per trade.
For round turn commission we need to take sum of commissions for opening and for closing trades.
In this case 2.14 + 2.14 = 4.28 USD
Remember our spreads on Crypto are raw so there is no markup, the only spread is the market spread.