PRNEWS.IO use API methods to receive statistics from SimilarWeb every month. These data may not correspond to absolute values, due to the peculiarity of their collection. The collection methodology implies: obtaining information through browser plugins and utilities; processing information from Internet providers; analysis of direct measurement data obtained through systems such as Google Analytics, Adobe Analytics.
You can try connecting your Google Analytics to SimilarWeb. Then the metrics will be accurate, and SimilarWeb will give them to us via API.
Contact SimilarWeb Support if you have any questions about the connection.