THERE IS NO ANNUAL FEE OR ANYTHING. THE SERVICE IS COMPLETELY FREE.
This is a virtual credit card service. Really great for Slickdeals user. I and as well as many Slickdeals users do not purchase many deals because we do not want to give many websites our payment info. Now we can use this service for those places.
I am using their service from when it was in Beta and invite only. Now it is open to all. It is free and you do not need a credit card and there is no kind of credit score pull. You only need a funding source and many many banks (around 15000 financial institutes) are supported. Even Simple Bank or Capital one 360. So you do not even have to give your main personal bank info.
And the greatest thing is that the limitation on the number of cards is really great. Like 12 cards per day or 36 per month which is I think more than enough. And finally, it has two-factor authentication so it is really secure. And there are lots of other benefits that you can read on their site. https://privacy.com/faq