System and Network for Detecting Unauthorized Activity

Methods, systems, and computer-readable media for identifying unauthorized activity events, assessing the unauthorized activity event and evaluating a potential impact of the unauthorized activity event are provided. In some examples, upon detection of an unauthorized activity event, merchant data may be received for a first evaluation time period. If a sufficient number of events has occurred in the first evaluation time period, additional data may be retrieved and analyzed to determine a control limit related to an expected rate of events. The number of events in the first evaluation time period may then be compared to the control limit and, if the number exceeds the control limit, a priority score for the merchant may be generated. Additional data, such as merchant category, particular state, and/or particular city data, may be analyzed in order to provide a more granular evaluation of a merchant.