This article provides the version numbers for any APIs that include a 'version':

Reviews API

Version     Release Date Details
10 (current) 28/09/2016 Initial release.


Product Ratings API

Version     Release Date Details
11 (current) 16/06/2017 Parameter updates. Version 11 is required to support all of the documented parameters (unless noted differently against a parameter).
10 28/09/2016 Initial release.