The Conductor Searchlight Ruby SDK by Ian Graham allows API interaction to access search features. Resources include authorization for requests and responses. Example shows email, secret key, and URL as credentials to receive data.
Microsoft has released a significantly enhanced version of their Live Search API. Live Search API 2.0 offers increased flexibility in terms of API protocols (REST/XML and JSON are now offered, in addition to the original SOAP interface), new tools, sample code, and complete documentation.