Gemini Exchange is a cryptocurrency exchange that allows users to buy and sell cryptocurrencies, as well as trade between different cryptocurrencies. Gemini also offers a built-in trading platform for users to track their portfolios and make trades. The exchange was founded by Tyler and Cameron Winklevoss, who are known for their involvement in the founding of Facebook.

Website: https://gemini.com/

Fees: https://gemini.com/trading-fee-schedule/

Twitter: https://twitter.com/Gemini