[_pdeschen]

But then you dont get data about how much someone is willing to pay. Why not at least have your pricing table and underneath each pricing package, a signup for free call to action button with their own href anchor ( /signup#gold ) to track within google anyltics or something? This way even though people so sign up for free you'll gain a bit of knowledge about which package they clicked on and as a side effect the potential intend. Not perfect but better then no metrics.

[ianstormtaylor]

Not to mention you're probably turning away signups that think a completely free API is too good to be true. Check out the first question of the Van Westendorp test: http://en.wikipedia.org/wiki/Van_Westendorps_Price_Sensitivi...

[polymatter]

link should be (http://en.wikipedia.org/wiki/Van_Westendorps_Price_Sensitivi...)