There are three different currencies in the Illuna world: the minecoin from the bitchange mod and the donorcoin and the noobcoin
Next to the minecoin there is the minenith, where nine minenith can be crafted to one minecoin. Both can be found as ores minecoin_in_ground and minenith_in_ground, which drop minecoins and coin base, where the latter can be cooked into minenith. Nine minecoins can be also stack as one minecoin block. Minecoins can also be get from gold by cooking gold blocks to minecoin blocks. You can see that one gold ingot has the value of two minecoins.
Minecoins are the main currency in Illuna. There is no official exchange rate to noobcoins ...