Unfortunately, RedCircle doesn't support Podder Insights prefix URLs.
Most other hosting providers do support adding Podder prefix URLs. That's why we're hopeful RedCricle will soon be able to answer all of our requests.
What you can do in the mean time is contact them via email (email@example.com) and ask them the following:
Message to send:
I've noticed that RedCircle currently doesn't support adding the URL prefix of Podder Insights (podderapp.com).
May I ask if there is some workaround that we can do so I can use their services?