Gold
From MHWiki
Gold is the currency of MouseHunt. It is earned by catching mice and, to a lesser extent, accepting rewards from the King. It can also be obtained through loot drops such as a Satchel of Gold or by returning surplus cheese, traps and crafting materials for a refund at the respective shops. All hunters also receive an hourly wage of 25 gold from the King.
Gold can be exchanged for traps, cheese, crafting materials, marketplace items, traveling, and repairing maps at the Cartographer.