Credits

Credits CR are the in-game currency used to pay for many actions:

Acquisition

Selling Minerals - ~35k per mineral point at high levels, after tariff
- See the Tariff section for details on increasing credits earned
Scrapping certain Artifacts
- See Increase Scrap Yields for methods to increase the gains
Undertaking certain Missions
Selling ship Modules
Research Contract - 25k per research point
Winning at the Spin the Galaxy Wheel game (Which costs 10 GP to play per go)
- Note: This is considered an ineffective way to earn credits

Daily ship upkeep (automatically withdrawn from player coffers each day)
Daily Legion Base upkeep (automatically withdrawn from legion base coffers each day)
Repairing damaged/disabled ship Hull
Building ship Modules (often requires Minerals as well)
Repairing ship Modules
Repairing Legion members
Building Legion Base modules
Constructing Structures on Planets (often requires Minerals as well])
Undertaking certain Missions
Colonizing or invading Planets
Galactic Trading Center