Email server issue has been fixed and signups are active again at
https://ico.wcex.co/.
We've knocked out most remaining issues for the Beta and have reached a good level of stability. Starting products are BTC, ETH, LTC, and XRP. We expect the rest of the invites to go out Monday and Tuesday if no other blockers arise.
But i don't use my referral link to invited friend, my referral don't increase although my friend still have verified