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Shapeshift is big and has a lot of potential. They already do the a lot of the token exchange in Jaxx and are also on the Exodus desktop wallet which looks really nice. If you haven't check, take a look at it here: https://www.exodus.io/releases/

Prism is also an interesting product so that the average Joe can easily manage a portfolio of other tokens and easily switch or rebalance between other tokens!

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