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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.
Bitex Bitcoin exchange is one of the services offered by Bitex payment provider along with concierge (enabling quick local payments) and boutique (bulk bitcoin purchases) solutions. Bitex is the Argentine platform that was founded in 2014. 
55 Global markets was established in the USA in 2017. The platform is declaring quite a big trading volume. Approximately it fluctuates at around 150-200 mln. $ per day.