To obtain a projected number of web visitors, developers can access SimilarWeb’s Traffic API which will display results in XML or JSON. This API is about traffic and it is valuable to monitor visitors' flow. From the amount of data to the number of visitors, this API could help developers to keep track of last month’s movement. With this API, developers could create an application not only to display usage, but also to improve future SEO strategies through web content and web placement. In the site, developers can find resources, support and features to create a successful application.