For Multi-Collateral contracts, fees are charged in USD.
If USD is unavailable in a trader’s account for fees, PnL, or funding payout, then available non-USD funds will be converted for a fee by prioritising converting assets by ascending order of collateral ‘haircut’.
e.g. if a Trader has EUR as collateral, fees will be taken out from its EUR balance.
Multi-Collateral contracts are subject to conversion fees and in some cases, interest on losses uncovered by USD collateral. For more info on Multi-Collateral fees, see Fees & Charges for Multi-Collateral Derivatives.