Bank of America, my credit card provider provides the same sort of service. They call it ShopSafe. You generate a temporary credit card number with a certain limit and you can set when it expires.
It is fantastic for purchasing goods from web sites that may not secure their card data completely, or if you are worried about fraud on the internet. I've also in the past generated the numbers for when I need to pay over the phone and don't want to hand out my credit card number!
Extremely handy, unfortunately it seems that not enough people make use of it, to the point that BoA employees in the fraud department are at times not even aware that the feature exists...
I'd be interested in using this, but I get so frustrated with Bank of America's fees. They want to charge $10/month just for using OFX to access your own financial transactions!
Given the level of security that most banks implement, this is completely indefensible in my books (given that the same information is available through the shoddy web interface).
Whether or not you have a fee for your card itself depends on what card you get; I'm not referring to those kinds of fees.
As for the second point, Mint/Intuit probably covers those fees for their own service, but they don't allow you to interface with them over OFX, so it's a moot point for anyone who wants that information for something other than Mint.
It is fantastic for purchasing goods from web sites that may not secure their card data completely, or if you are worried about fraud on the internet. I've also in the past generated the numbers for when I need to pay over the phone and don't want to hand out my credit card number!
Extremely handy, unfortunately it seems that not enough people make use of it, to the point that BoA employees in the fraud department are at times not even aware that the feature exists...