It seems there have been a lot of stolen cards used on Namecheap lately.
15 days ago I got my creditcard banned, and they dident want to tell me what site was the reason my card was closed. When I used my new card today, for the first time(on Namecheap), I got a SMS message within 5 minutes with a "early warning". I managed to get a hold of my bank and tell them to whitelist the site, and that I take full responsibility for any charges from that site.
This proves it was Namecheap, and the bank-support admitted it when confronted. It's seems they use stolen creditcards to buy overpriced domains listed for sale by scammers.
Money laundering sucks
Fix: Charge it through Paypal
