@gertig@tommyrva It's the Clearbit API indeed. They wrote a small blog post about svbtle using it: https://blog.clearbit.com/svbtle and there's more information about Clearbit here: https://clearbit.com/enrichment
It's interesting to see how the guys behind svbtle turned this into an affordable standalone product.. hopefully they'll be able to lower the prices even more! (magic starts at $20 - Clearbit starts at 99$).