There are ways to produce STO credits for your character in Star Trek online. But first you need to produce these points; Energy credits or EC, Dilithium for Zen, Fleet marks implicitly for Fleet credits and reputation marks. Read more of this guide for earning these points and exchange them for credits.
Energy Credits for STO Credits
To make EC, first make sure your character is at level 50, and then go to a farming Foundry mission and start making EC. A farming mission is a mission where dozens of ships spawn in a raw and you kill them for the items dropped. A great farming mission will give you at least 500k EC in items. It is also a good farming mission will spawn ships with no shields, so they will be killed easily. It will help you make a decent amount of EC so you can survive your needs.
STO Credits Purchasing
In case that you don’t have much time grinding for credits, you can purchase STO credits at PlayerAuctions.com. You can also sell your credits if you have great income, earn profits using your STO credits and sell it to other players. Having good profits in credits will give you chance to purchase in-game premium items.