The currency in game is Crowns (gold). Currency can be used to repair armour or buy items & recipes at Vendors & Shops. Crowns are also used to pay for crafting taxes within a region. Guilds can collect these crowns from the gold collected by taxes.
1 Gold Crowns = 100 Silver Crowns
1 Silver Crowns = 100 Iron Crowns
1 Iron Crown = 100 Copper Crowns
1 Copper Crown