Spreads may vary per instrument according to market conditions. Instruments which are typically more volatile are more susceptible to wider spread variations than other, more stable, instruments.
This means that the spread you will receive at the opening and closing of a position cannot be fully predicted. However, Monyxa seeks to provide the best rates possible at all times and works only with top tier liquidity providers. The spreads on our fees page represent the minimum possible spread for any given instrument and should therefore be used only as a guideline.