The Engagement API could be beneficial for developers who want to obtain 3 web engagement results when they access a website. Because this API is about engagement, developers could create applications with improved functionality and accessibility. The results will display in either XML or JSON. The metrics provided are average page views, average time on site, and bounce rate. API Key is needed. This API is about engagement and it is valuable to monitor device patterns. Developers can contact SimilarWeb via e-mail to have a better understanding about app creation practices.