Most Atelier 801 multi-player games have in-game currencies, which allow you to unlock features or buy in-game items to decorate your character. The notable exceptions are Extinction and Module 801 games.
Each game has different currencies, and which to some extent they may serve very similar functions, how they are obtained and what each game offers for purchase differ. Some games may also offer event currenies, but these are not listed here.
Fraise are a form of micro-currency that can only be obtained by purchasing them with real world cash. While Fraise don't effects stats and not everything in a game is purchasable with Fraise, it offers an alternative way to obtain some items versus using normal game currencies (except for a few situations where items may be Fraise only purchases).
Currently the only game that supports Fraises is Transformice, but it has been stated that if other Atelier 801 games introduced paid micro currencies, then these currencies would be universal across the Atelier 801 network, and Fraise bought in Transformice would be usable on other games as well. Fraise can also be used to change your nickname.