GET Open Data Service, which provides access to Sentinel HUB data, gives also access to new data which can be found an used through the service and these are Sentinel-2 L2A data. They concern Sentien-2 data with atmospheric correction with Sen2Cor algorithm and digital terrain model PlanetDEM. Data are available for Europe area. With the use of Sentinel Hub platform, correction can be applied to all available historical Sentinel-2 data. You can see here examples of atmospheric correction