Systems and methods for providing third-party content can include a data processing system receiving a first content selection parameter and a plurality of second content selection parameters to manage serving of content items of a third-party content provider. The data processing system can store the first content selection parameter and a plurality of second content selection parameters in a memory bank. Upon receiving a request for third-party content, the data processing system can retrieve the first content selection parameter and the plurality of second content selection parameters from the memory bank, and determine a parameter among the first content selection parameter and the plurality of second content selection parameters. The data processing system can select a content item from a plurality of content items of the third-party content provider based on the determined parameter, and provide the selected content item for presentation on a client device.