Currency
Currently there is 4 types of currency In-game,Galactic Standards,Credits,Loyalty Vouchers And Artifacts. Each currency type is used to buy specific Items and some currency types can be "exchanged" for another.
Exchanging
Galactic Standards can be exchanged for Credits (the exchange rate at the time can vary significantly). Credits can be exchanged for Galactic Standards (the exchange rate at the time can vary significantly).
These are the only two currency's that can currently be exchanged with one another.
Galactic Standards
http://docs.google.com/file/d/0Bx3o4HBaPVeNODBDd0k2bjl5QjQ/edit http://upload.wikimedia.org/wikipedia/mediawiki/b/bc/Wiki.png
Credits
Loyalty Vouchers
Artifacts
Version
As of this writing S-C is in v.0.9.10.
This Information is correct fir v.0.9.10 however things may have if this is not the current version.