Computing devices, systems, and methods for automatically prompting a foreign currency transaction by detecting a trip end condition associated with a registered user with respect to travel to a foreign location associated with a foreign currency. The methods and system may further determine that the registered user has a remaining foreign currency balance, and, as a result, may identify and send to the registered user's mobile device at least one option for using the remaining foreign currency balance. The at least one option may be a merchant offer from a merchant located in the area of the mobile device or may include an option to exchange the foreign currency for another currency. The trip end condition may be detected by determining that the registered user and/or user's mobile device is at an international departure location. The currency exchange may be with another registered user.