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This paper focuses on passive Quality of Experience (QoE) monitoring at user end devices as a necessary activity of the ISP (Internet Service Provider) for an effective quality-based service delivery. The contribution of the work is threefold. Firstly, we highlight the opportunities and challenges for the QoE monitoring of the Over-The-Top (OTT) applications while investigating the available interfaces for monitoring the deployed applications at the end-device. Secondly, we propose a multilayer passive QoE monitor for OTT applications at the user terminal with ISPs prospect. Five layers are considered: user profile, context, resource, application and network layers. Thirdly, we consider YouTube as a case study for OTT video streaming applications in our experiments for analyzing the impact of the monitoring cycle on the user end device resources, such as the battery, RAM and CPU utilization at end user device.