In the final game, NetherRealm has put in seven kinds (!) of Mortal Kombat 11 in-game currencies, and here’s all of them listed down along with descriptions for each. There are also loot boxes in the game, which contradicts NetherRealm’s earlier statement (with video proof) that it won’t be part of the game.
Source: N4G PC There Are 7 Kinds of Mortal Kombat 11 Currencies, Loot Boxes Are in the Game Contrary to Statement