Just now OnePlus team has announced that the OnePlus X goes Invite Free forever. Earlier the OnePlus One and the OnePlus 2 were already made Invite Free in India and now it continued for the OnePlus X too. Looks like now the OnePlus team is on track to handle customers overwhelming response. It could also be possible that now the OnePlus X demand has come down then the supply stock that they have it currently so they have made it invite free forever.
The invite free system is starting February 5, 2016 (midnight) onwards, for the OnePlus X which includes all the three variants in Onyx Black, Champagne Gold and the limited edition Ceramic are available on Amazon India for purchase without any invites.
If you were waiting for a OnePlus X to own then yes you will be definitely in joy.