The APIs consist of REST web services, although they are not a strict REST implementation. Most return JSON or GeoJson. Many also accept a query parameter of links=true. This allows the API calls to be browsed from web browser, especially if you have a JSON formatter installed. A good place to start would be https://sg.smap.com.au/api/v1/admin/projects?links=true This will return the projects that you have access to and links to get more data related to each project.