Idex exchange is an Ethereum based exchange that has its own token known as 'aurora'. It offers a wide array of ethereum based tokens numbering into about 300.
The exchange is well secured as all funds are held in smart contract in the ethereum blockchain. No wonder it does not have any record of hacking yet.
Also users have full control over their funds as Idex Platform cannot access user's funds unless it is permitted by the user via the cryptographic signature and private keys which are held by the user.
But the exchange has not been enjoying high liquidity recently.