what are c stacks in payday 3

C-Stacks are a fictional cryptocurrency introduced in Payday 3 that can be used to make in-game purchases. They are not a premium currency and cannot be purchased with real-world money. Instead, players can convert the loot they earn from heists into C-Stacks. C-Stacks can be used to buy items from vendors that cant be purchased with cash, including high-level goods and cosmetics. They are sold in packs of one, five, or ten, and each time a pack is purchased, the next pack of the same size gets more expensive. C-Stacks can be purchased from Setaggi, the Currency Vendor on the games main screen between heists. Players can also earn C-Stacks as a reward for completing specific career challenges.