# Exchange

CoinsEngine features built-in exchange system that allow players to exchange one currency for another.

Say we want to set exchange rates for Gems and Coins, where 1 Gem = 5 Coins. In this case our exchange rates will be the following:

• Gems -> Coins = 5
• Coins -> Gems = 1 / 5 = 0.2

Let's add them in the currency configs:

Exchange:
  Allowed: true # Must be enabled.
  Rates:
    coins: 5.0

Exchange:
  Allowed: true # Must be enabled.
  Rates:
    gems: 0.2

Now players can exchange Gems to Coins with 1 to 5 rate, and Coins to Gems with 5 to 1 (aka 1 to 0.2) rate.