For Podcasts use
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topPodcasts/json
I have also found a way how to display TOP results from different countries
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topPodcasts/json?cc=de (Germany)
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topPodcasts/json?cc=fr (France)
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topPodcasts/json?cc=gb (United Kingdom)
tomasvyskocil
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Got the same problem.
I have found this alternative on https://www.apple.com/rss/, but it's only for the US
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topMovies/json