There are 3 main currency in kumu and these are:
Coins are used to buy virtual gifts — backed by real money — for your favorite livestreamers! You can purchase coins through your wallet, or you can earn coins through various actions on the app such as referring friends and participating in some of the game shows!
When you receive virtual gifts, your earnings are tracked in the form of diamonds. Diamonds can be converted into cash after you hit the minimum balance of 50k diamonds.
The only way to earn diamonds is through Livestreaming - How to Livestream?
Kurot Points is the currency used to get your levels, it is a sort of experience users can get by giving gifts and doing a livestream.