Abstract: Systems and methods for reserving a particular third-party content slot of an information resource of a content publisher. A processor receives, responsive to an action to an object included within an information resource of a publisher, a request to receive information for inserting a creative within slots available on the information resource. The processor provides, for display, an interface that includes the information regarding inserting the creative within the content slots on the information resource. The information identifies slots and costs associated with inserting the creative within each of the slots. The processor receives, via the interface, a request to insert a creative within a particular slot according to a reservation policy. The request identifies the creative to insert in the particular slot and the reservation policy. The processor stores data associated with the request to insert the creative within the particular slot.