Originally Posted by Discover

Dynamic currency conversion

Be wary of dynamic currency conversion when using your card to shop overseas. Many merchants will offer the ability to charge your purchase in dollars rather than the local currency. It sounds appealing, but doing so can result in hefty conversion fees, in some instances up to 6 percent. Some consumers may think that dynamic currency conversion will help them avoid a foreign transaction fee, but that’s simply not the case. Credit card companies will generally charge the foreign transaction fee in addition to the charge made from dynamic currency conversion.