Keyword Discovery - API manual
The Keyword Research API (Application Programming Interface) provides a set of query functions to the Keyword Research database. The API can be integrated into custom applications or used as an alternative interface.
The API provides functions for retrieving data on single keywords, multiple keywords from a single query and account status checking. The queries return all data in XML format and the functions accept parameters as GET or POST values.
NOTE: All data provided should be correctly URL encoded.
For more information on how to implement the Keyword discovery API in your applications using programming languages, see actual PHP, Perl and C#.Net code examples.