This is the WiMAX key checker found in the Android Market
https://market.android.com/details?id=com.joeykrim.wimaxkeys 

Credits:

 * birbeck: http://www.appsbybirbeck.com/
 * AntiSociaL: http://xpl0.it
 * LouZiffer
 * shift: http://www.twitter.com/SHlFT
 * slushpupie: http://android.slushpupie.com
 * thenuge
 * shinzul: http://twitter.com/shinzul
 * toastcfh: http://forum.xda-developers.com/member.php?u=1561342
 * sdx-developers: http://www.sdx-developers.com
 * #teamwin: http://twitter.com/teamwinandroid
 * #htc-evo: http://webchat.freenode.net/