Site: bitocto.com
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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.
BTCMEX aims to bring the standards of the financial sector to the crypto world by providing innovative solutions, state-of-the-art security, a better trading experience, and a client-focused development. 
In 2007, "The Rock Insurance Co." was born as a Virtual Insurance Company in Second Life, the first one of its kind. Since then, their product has evolved a lot but they kept the same management teaIn 2010, they changed their name to “The Rock Trading”, with a division dedicated to managing funds and an exchange to trade currencies and stocks. In June 2011, the first Bitcoin was traded on The Rock Trading, making it one of the oldest exchanges still alive! As the website continued to grow, they started to add new currencies (such as Litecoin, Namecoin and others) and in May 2013 they became a Ripple gateway and an official XRP reseller.