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Ive been using this exchange for a while no need to register https://shapeshift.io/ also using the app for coin market nice to follow your altcoin portfolio on IOS
https://info.shapeshift.io/coincapio-web-and-mobile

Shapeshift is not really an exchange, since there is no order book and you cannot store anything in there. But indeed, it is a very convenient way to swap from a coin to another coin. You don't need to register, but they take a little fee ;)

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