To find out if a username is taken, go to your Mojang account and click change. Third party checkers and hasPaid are not always accurate.
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@MojangSupport how do you change your username? :)
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Replying to @nathanjay1234
@nathanjay1234 Log in to your Mojang account at account.mojang.com/login where you can find a link to username change. ^OZ

Feb 4, 2015 · 2:55 PM UTC