What is one of the most unique exchanges in the world?

Changelly is one of the most unique exchanges in the world. You can exchange convert bitcoin to usd

 with Credit Card and Debit Card but the exchange also allows direct trading of various Cryptocurrencies. For example, if you had Bitcoin and you wanted Ethereum, you simply select it and away you go. Changelly has no wallet structure so everything you do requires you to enter your own wallet address.