GP can be obtained by selling untimed equipments, potions, gems, and more, or by completing dungeons. The max GP that can be held at once is 10,000,000.
In dungeons, GP must be picked up individually. They appear as gold and silver coins that are dropped by monsters. Silver coins = 10. Gold coins = 50.Sometimes, players may receive GP Coupons through events. Those coupons can be exchanged into GP anytime.