Coin

are golden cylinders with an image on either side.

Uses
Coins are used to buy and sell goods between players, either "under the table" or via Trade Decks in the marketplace.

Outside their intended use above, some Players use them for gambling or as fun by flipping the coin and seeing if it lands on heads (Skull) or tails (Pickaxe).

Obtaining
Coins can be made from Gold Ingots (1 Ingot = 5 Coins) by way of the Coin press in Town Hall. They can be found as loot in the Overworld and in Cave Structures.