If you are looking to buy items in Lost in Random, then you will need coins. As it happens, there are several ways to get coins. The primary resource you will buy with these coins is cards, which are crucial to winning combat engagements.
To get coins, you have a few options. You can shoot pots with your slingshot, you can earn coins randomly as a reward for combat, and lastly, you can find Dice Doors that are scattered throughout Lost in Random's many worlds.
Pots are spread all across the worlds of Lost in Random. You can easily recognize them by their blue glow. When you aim at one with your slingshot, your crosshair will turn blue. Simply shoot the pot and its coin will automatically fly to you no matter how far away you are. Keep in mind that pots can be in plain sight or hidden high, low, and behind obstacles.
While it is random, you can also earn coins as a combat reward. You will be shown your reward at the end of each combat sequence, and that reward may just include coins. The other way to get coins is to send Dicey through Dice Doors. This will shower you with a random number of coins. The first time you find a Dice Door, you will receive a large number of coins.