castbox.fm
In short: Getting listed on Castbox is free. Plan for about 45 minutes — there is material to prepare and a review to wait on.
What they ask for: Add or claim your real podcast in Creator Studio and complete channel, site and episode metadata.
Add or claim your real podcast in Creator Studio and complete channel, site and episode metadata.
Must own the show and verify access to its RSS email; publish original audio content.
Open the submission page on castbox.fm and complete its form — that is the "Open submit page" link at the top of this page.
Must own the show and verify access to its RSS email; publish original audio content.
Priority sets the band — this one is high. Cost (free) and effort (moderate) move it within that band, which puts it in the high impact tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.