Hello.
Very interesting project! I am happy to see another utility coin with masternodes , those "next Bitcoin" project that are now live are killing all the sentiment on market , people only lose money , even if ROI is +1k%.... lol
I must say fiat relays are big thing among with reward system.

Do you plan more currencies than $USD ?
I found information that there is 4 masternode types? Correct ?
Standard and Premium gets reward , and what is with other 2 types

Are those mandatory for network to work ?