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I don't know but you can exchange it on shapeshift

You will need to send the Eth from Coinbase to an Ethereum Wallet that supports ERC-20 tokens first, after that you can purchase your Rush Tokens (from the wallet) without any problems. We tend to recommend MyEtherWallet, but in the end what you use is down to you.

We also have a guide on how to set up a MyEtherWallet, along with an explanation why such a step is needed over here.