Currently Podcasts do not generate performance and/or mechanical royalties. Rather, the podcast creator will pay a fee (usually equal to a very low sync fee) to use your music in their podcast. Other than this upfront license, there are no additional publishing royalties generated from the streaming or downloading of said podcast at the moment.
Songtrust is more than happy to handle an these license requests for you. If you would like us to handle a license request please email email@example.com.