Chroma Credits in Brawl Stars are used to unlock Chromatic Brawlers. You can earn them through the Brawl Pass, Masteries, the Shop, Trophy Road, and your account.
With the upcoming removal of Chromatic rarity, Chroma Credits will be converted to regular Credits. The conversion rate is 1.85 Credits for every Chroma Credit.
These regular Credits can then be used to unlock other Brawlers or for various in-game purposes. This change ensures that your Chroma Credits still hold value.
So, Chroma Credits are a versatile currency in Brawl Stars. They help you unlock and enjoy more Brawlers in the game.