If you would like to test Skimwords, a great keyword you can enter to test this is 'ebay' which is definitely a converting keyword in SkimWords. A link should be created which you can right-click and copy & paste the link into a new browser tab or window to see whether the redirectingat.com prefix is added.

Note: If you’ve enabled the custom subdomain setting, it’ll look more like http://www.go.yoursitename… 
This is a great option to make Skimlinks look like a part of your site – you can check it out and enable it in yourPublisher Interface.