Arcblock (ABT) token is currently based on cryptocurrency Ethereum protocol. It is a pre-mined utility token used to pay expenses within the ArcBlock ecosystem. At the moment, ABT is listed on a number of exchanges with the possibility to trade it against fiat (KRW on the Bithumb exchange).
DEW (DEW) abbreviation stands for “Decentralized Exchange of the World”. Therefore, DEW token is the native token of this exchange platform. It is based on the Ethereum protocol. You can buy DEW for crypto (for example, BTC or ETC) on the number of exchanges.