Gemini is a USA-based crypto exchange founded by the Winklevoss brothers. Gemini is most similar to Coinbase in that USA and Canada citizens can bring new money into crypto space via bank wires or ACH. Like Coinbase, Gemini fee’s are extremely high.
Currencies currently trading on Gemini: USD, BTC, ETH, ZEC
** They announced LTC & BCH will be trading soon as well.