You can buy GC from the sweepstakes casino, and also receive this currency as a reward - for example, when you sign up for an account with the operator.
Gold Coins don’t hold any monetary value but are the required currency to enjoy the social aspect of the online sweepstakes experience. There are two types of virtual currencies to be aware of when preparing to play at online sweepstakes casinos - Gold Coins (GC) and Sweeps Coins (SC).