Site: bitni.com
Mobile app: -
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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.
Lykke is the cryptocurrency exchange incorporated in Switzerland with offices across the world. Its products are open-source. Lykke is the initiative of the Oanda’s founder, a famous forex exchange trading platform.  
Cryptox exchange was established in 2016. The exchange’s website has English and Polish language versions. It offers quite a limited number of coins paired against BTC but may be handy for Byteball trading fans.