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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. 
LetsExchange offers order books with top tier liquidity, allowing users to easily exchange Bitcoin, Ethereum, EOS, Litecoin, Ripple, NEO, and many other digital assets with minimal slippage.
Indodax is one of the biggest crypto exchanges in Indonesia. It provides cryptocurrency pairs against BTC and IDR, Indonesian Rupiah.