If the traffic between your robot (on the openkapow server) and the web site it is interacting with is encrypted or not depends on if you are using HTTP or HTTPS to interact with those sites. If your robot is using HTTPS in all URLs in Load Page steps etc, then all the traffic between the robot and the site is encrypted. Basically it is the same ...

Just use https to call your robots instead of http. For example: https://service.openkapow.com/Andreas/addtodotobasecamprest.rest?...  It is that simple.    

I am not too keen on calling robots using plain HTTP since I plan to do robots that will use usernames and passwords to login to different sites. Can I use HTTPs instead somehow?