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HitBTC Cryptocurrency Exchange is a platform created in 2013 that allows you to trade more than 300 cryptocurrency pairs. The platform was launched back in 2013 and the investments it received amounted to about 6 million dollars.
DDEX uses a hybrid model decentralized exchange, where no user account is created. It also describes itself as a most advanced margin trading platform on Ethereum. 
EtherMium is a smart contract running on the Ethereum Blockchain.