The QoS-VEChain project aims to enhance Vehicle-to-everything (V2X) services in the Internet of Vehicles (IoV) using Network Slicing (NS), Network Function Virtualization (NFV), and Mobile-edge Computing (MEC). It optimizes V2X services via machine learning, energy-saving techniques, and explores Space-Air-Ground Integrated Networks (SAGINs) for efficient, cost-effective, and tailored solutions.