Alex McCaw mentioned in Clearbit's launch post earlier this year that Svbtle is using their API to auto populate their sign up form:
http://blog.alexmaccaw.com/clearbit
My guess is that Magic is using Clearbit's API as a base, then layering on their own scraped data sources as well, which is a pretty common strategy for these types of APIs.
Probably not. That clearbit form tells me that they don't have my email address, but my information was pre-populated into Svbtle when I used that same address.
I got the same thing the first time, but I did it again and it sent me an email to claim my account. Maybe their site got overwhelmed by HN requests? Not sure what happened.
If you don't want to provide clearbit with additional information (e.g. location), it might be useful to remove yourself with this link via a VPN or hide.me
Does anyone know if Clearbit is just a frontend for Fullcontact? I tried both recently, and all I get from Clearbit is basically a subset of Fullcontact (plus some added data eg lat/lng)...
That link doesn't seem to provide opt-out, it just provides a way to request the deletion of specific records. But you have to find the page for the record before you can request it to be deleted.
My guess is that Magic is using Clearbit's API as a base, then layering on their own scraped data sources as well, which is a pretty common strategy for these types of APIs.