'GOW2EXP' is the well known Gears of War 2 multiplayer calculator, used by hundreds of thousands of Gears of War 2 players.
GOW2EXP's API enables you to create apps and experiment with the backend powering the calculator.
REST API with both JSON and XML responses available.
Requests must have a valid API Key, which you can get free on the try it page.
Outputs:
{"level":100,"experience":6825825,"progress":100,"previous":199089,"next":201079}