The U.S. has been doing the same for years with ESTA. The fee is $21.00.
All eligible nationals or citizens of VWP countries who plan to travel to the United States for temporary business or pleasure under VWP are required to receive an authorization through ESTA prior to boarding a U.S.-bound airplane or vessel or presenting themselves for admission at a United States land border port of entry. The term “United States” refers to the continental United States, Alaska, Hawaii, Puerto Rico, Guam, the Virgin Islands of the United States, and the Commonwealth of the Northern Mariana Islands.