I can retrieve recent iOS reviews like this:
fetch(`https://itunes.apple.com/${IOS_LANG_CODE}/rss/customerreviews/id=${IOS_ID}/sortBy=mostRecent/json`)
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I think I might be very late to answer this but YES there is an absolutely free way to get the rating of the application. You can use
http://itunes.apple.com/lookup?id=
to get a JSON with all the basic info related to your application. The key that you are looking for is averageUserRating
. This will return a Double value and indicate the exact current iOS Rating.
To quickly check a sample, have a look at the details of the Amazon app(com.amazon.Amazon)
https://itunes.apple.com/lookup?id=297606951