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OceanEx is a centralized cryptocurrency exchange founded in November 2018. The company has headquarters in the Cayman Islands. Among the core members of the OceanEx team, there are people who worked in CISCO, Samsung Research, Baidu, Morgan Stanely, and some other big companies.
Nocks is the cryptocurrency exchange registered in the Netherlands. The Nocks v.01 network was launched in 2015. As of now, the Nocks trading platform covers such markets as EUR, BTC, ETH, and NCKS, the platform’s native token. 
Cobinhood is a centralized cryptocurrency exchange based. The exchange was launched in 2017. Deposits are free on the exchange. Cobinhood doesn't have a fiat deposits option. Margin trading option is available on the exchange. The exchange has 3.5 score on Trustpilot, based on 8 reviews. Cobinhood is quite active in social media, with more than 52000 Twitter followers. You can leave your review about Cobinhood here.