Systems and methods that may be used to provide cross content network event attribution are provided. One method includes receiving, by a coordination server, an event attribution request for a second event from an attribution server, the second event is an online activity performed by a user via one of a plurality of user devices after a first event, the first event is another online activity performed by the user via one of the plurality of devices. The method includes determining, by the coordination server, whether the second event is attributable to the first event.