Gemini is one of the small exchanges and best place to sell Bitcoin with headquarters in New York, US. You could originally only buy Bitcoin or Ethereum for US dollars, but unlike other exchanges working with fiat, Gemini has very low commissions – 1%. One of the core advantages of this exchange is that the information about the accounts is stored offline on cold storage system.
Now you can buy many other coins using this exchange, Zcash, for example. You can use prepaid visa cards to buy Bitcoin there. The platform allows you to purchase Bitcoin with any Debit Card.