Old Currency, no longer in circulation: COLR Token (info)
New Currency: Ethereum (ETH)

Initially used as a way to buy the right to place colored blocks on any land, $COLR was the official currency in Voxels. However, after colored blocks became free for everyone in early 2020, it is no longer used. Ethereum is now used for in-world transactions.

The currency used to buy land, wearables and other services is Ethereum.

For reference, here is the old $COLR token address: 0x3867ef780a3afcf1201ef4f2acc6a46e3bd1eb88