Mastercard foreign exchange rates Tania August 13, 2018 23:39 Updated Follow We don't charge any extra foreign exchange fees. You would have to pay the base foreign exchange rate set by Mastercard. Click here to check out Mastercard's currency conversion calculator here. Related articles What are the transaction fees for foreign currency? Is STACK covered by CDIC? Do you have Interac e-transfers? Why does STACK need my location? How is my information protected at STACK? Comments 0 comments Article is closed for comments.