The API is implemented as an XML-RPC web service with three methods whose names describe their function: metaweblog.newPost(), metaweblog.getPost() and metaweblog.editPost(). These methods take arguments that specify the blog author's username and password along with information related to an individual weblog entry.
The impetus for the creation of the API in 2002 was perceived limitations of the Blogger API, which serves the same purpose. Another weblog publishing API, the Atom Publishing Protocol became an IETF Internet standard (RFC 5023) in October 2007.
Many blog software applications and content management systems support the MetaWeblog API, as do numerous desktop clients. As of June 2013, the +1000 websites hosted on AgileSite's CMS platform utilize MetaWeblog API. AgileSite partnered with Blogpress App for iPad / iPhone mobile support. The companies utilize the API to allow for easy and robust integration.