The aim of the ESPAS e-Infrastructure is to facilitate access to data from the near-Earth space environment enabling exploitation of multi-instrument, multi-point science data for analysis, model building, data assimilation into models, model-observation comparison, space environment nowcast and forecast, to name just a few. The ESPAS project, currently in its fourth year of activities, has developed a set of tools to allow the data providers to interoperate through well established standards, deployed in at all participating data nodes and a coordinating central platform. This paper provides a high-level overview of the system model, architecture and functionalities, and presents indicative science use cases that ESPAS can support.