Gemini is a cryptocurrencies exchange that is fully registered and licensed by the United State government in 2015 which make it to be trustworthy for holding different types of cryptocurrency assets and also exchange with ease and confidence, it's highly secured and safe.
Gemini offers upto four different types of trade which is Market, Limit, MOC, and IOC. And the most popular cryptocurrency in the exchange is MTC and ETH.
The only flows I noticed with this exchange is limited to some country which means is not available for trading in some countries.
One of the amazing thing about this exchange there are upto four different languages on the exchange. Which makes it more easier for non English speaking countries and its available in over 150 different countries.