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BITKER was established in Singapore as a centralized cryptocurrency exchange. Following to their outage announcement in September 2019, the exchange platform had suspended its activity. The reason behind this was a cyber attack. 
Simex was launched in Russia as a coin exchange in 2015. This platform has a great liquidity. The volume of the platform is more than $ 320 mln. The exchange has an interesting tool – the coin aggregator.
Based in the British Virgin Islands and Operated by BTC King Technology Co., Ltd, BKEX is a multi cryptocurrency Exchange.