The Washington Post White House Visitors API has stored White House visits since January of 2009. Currently, The Post has more than 2.2 million loged visits with more being added quarterly. The Washington Post White House Visitors API expresses RESTful API calls and responses formatted in JSON.
The Washington Post has launched its first APIs, all with a political usage. The Washington Post staff created applications over the years that collected a lot of data. Now it's making the data available, via its Washington Post APIs, to civic hackers.