Decentraland (MANA) is currently based on cryptocurrency Ethereum protocol. You can trade this digital asset on the fair number of exchanges. For example, Binance features MANA/BTC currency pair.
Credits (CS) cryptocurrency was launched in 2018. Being originally based on cryptocurrency Ethereum protocol, this cryptocurrency underwent a swap to the native mainnet. As a result, there are two assets are functioning at the same time: ERC20 CS token and CS coin. Credits token can be purchased in the number of exchanges for cryptos and is available with various wallet applications.