Abstract: A computerized system and method for detecting fraudulent network usage patterns using real-time network monitoring of at least two disparate networks is shown which receives at least one event record from each of the disparate networks, analyzes each of the received event records to determine its type based on user-defined parameters, identifies predetermined fields in the analyzed event record to be used as keys, measures network usage associated with the key, summarizes usage statistics against at least of the keys, compares statistic totals to predefined thresholds, and responds with an alarm or the like when the thresholds are met or exceeded.