Actually, there are no types of utility token.
Three types of cryptocurrency tokens:
Currency tokens - This is the original (and most straight-forward) form a blockchain-derived token can take.
Utility tokens - These digital assets are built to provide investors with something other than a means of payment. This typically comes in the form of access to a particular product or platform.
Investment/asset tokens - Investment tokens are perhaps the most complicated to classify. Tokens found in in this group are the assets that promise a positive return on their investment

Roks is a stablecoin.