This API program can be used in two format JSON & XML for web projects. Mostly this API will be helpful for created any seo tool. Responsiveness of design is one of the factor in SEO, so this can used for calculating SEO factor value.
JSON is most popular web API format, this format accepted by many API provider so we also have responsive check API in that format.
Also we provide this API program in XML format, if anyone like this format then must use.
<result> <url>http://www.mercenie.com</url> <responsive>true</responsive> </result>