Dogecoin is mandatory for playing the game. Dogecoins can buy both upgrades or helpers. Doge Diamonds can only unlock upgrades. Dogecoins are the main currency of the game. When you are mining with your Pickaxe, you get dogecoins (simple). Friendly Helpers can also make you dogecoins. They don't give you Dogecoins for purchasing them, Instead, they increase your DPS (Stands For Dogecoins Per Second).
Once you keep getting more Dogecoins, you can either buy a new helper or an upgrade.
There is no limit to how many Dogecoins you can get in the game.
Dogecoins cannot exchange for Dogediamonds except for the Dogediamonds in the D.I.A. Mission. You can get 60 Dogediamonds max from dogecoins. This will usually need you to get to at least 30B dogecoins before you confront Kitler. The other 15 can be achieved by getting pickaxes. You must have all 75 pickaxes to get all 15 Dogediamonds from pickaxes.
Looting[]
Depending on how many helpers you have, the Dogecoins that come from items like bags will also increase, meaning you get more Dogecoins from Stats And Helpers.