Earning interest? no. You're risking it by putting or depositing to an exchange for which they hold it and they won't give you the private keys. Well, what you must has already been suggested by NeuroticFish, people from the Collectibles are experts there and can give you the best answer that you want to hear. But again, if you're going to put that on exchange, you might do better if you're going to hold it on a wallet that you hold the private keys.