Traffic transparency and ability to react to pattern changes became more than a nice to have functionality in modern communication infrastructure. ThresholdS module within CGRateS offers the ability to monitor generic events in real-time and react when preset thresholds are hit. As reactions, one can set notifications via HTTP or AMQP or CGRateS accounts related top-ups, debits or complete account deactivation. The events can be injected into ThresholdS via simple RPC (ie: JSON-RPC over socket), contributing to easy integration from external systems. In case of the high amount of events received in a short time, ThresholdS will absorb them via built-in DoS protection and only react on predefined intervals or number of events. All these characteristics make ThresholdS an ideal candidate as a standalone component (without involving additional billing subsystems within CGRateS) for fraud detection and mitigation. CGRateS is a battle-tested Enterprise Billing Suite with support for various prepaid and postpaid billing modes.