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Coinigy is a great platform that gives you the ability to combine all of your wallets and exchange accounts in one interface using API keys from all different exchanges. The platform was founded in 2014 by a group of dedicated developers, traders, analysts, and evangelists that believe in the global crypto-financial industry.  
DSX is a cryptocurrency exchange founded in the United Kingdom. The platform has high trading volume and a wide range of pairs to trade with.
BitMarket had been known as a centralized cryptocurrency exchange. It was launched in Poland in 2014. As of now, its website is offline.