Opencaching.us is the official Opencaching site for North America and all US Territories. Users can add to the site's database of cache including descriptions and instructions necessary to find them. Users can also can organize their favorite caches, build custom searches, be instantly notified of new caches, seek and create caches of all types, export GPX queries and more. This data can be accessed via an API. The API uses RESTful calls and responses are formatted in XML and JSON.