Coinbase is a leading digital currency platform and wallet where sellers and buyers can transact with new types of digital currencies such as Bitcoin, Ethereum, Litecoin, and Bitcoin Cash. The exchange was founded by Brian Armstrong and Fred Ehrsam in 2012 and is based in San Francisco, California. They focus on the US market, however, the company currently operates in 31 countries and offers storage of bitcoins in 190 countries around the world.
IDEX is a cryptocurrency exchange that was launched early last year. The exchange aims to offer users the experience of a centralized exchange that boasts the security benefits of a decentralized platform.
The exchange provides a peer-to-peer trading environment. It also uses smart contracts to relay transactions over the Ethereum blockchain, and this allows the order book of your account to be updated in real-time.