The $20 price guarantee was stated by Josh here, for example:

http://i.imgur.com/0ALEUYW.png

http://i.imgur.com/0ALEUYW.png

This then got retroactively edited a few times.

https://archive.today/a7ySo
https://hashtalk.org/topic/25441/paybase-launch-rescheduled

Did Paybase launch with no fees, as stated?