The main currency of Math Prodigy is Gold Coins. It can be used to purchase items, pets, and houses, and can be obtained from battles. An example of getting 250 coins (older version!) after a battle shown to the right. defeating pets will usually result in 100 Gold Coins, Increasing by 100 for every other pet if there are more than one.
Gold Coins may also be rewarded when completing quests from leader in the five elemental zones. They may be rewarded from Sir Vey from the Lamplight Docks, the Tek-Y4 minigame, or the Dyno Dig Oasis minigame for finding fossils.
There is one other type of currency: Relic Coins! They appear as old copper coins, and are common in Dyno Dig sites, post-battle reward chests, and more. Trade them in to Wandering Wares for epics gear. Each piece cost 5 Relic Coins, and there are 10 gear pieces for sale in total. It's wise to wait until you've obtained at least 50 Relic Coins, and sweep Wandering Wares's shop empty. This gear is sure to be epic!