The PR-2 prototype of LEONSEGS focused on demonstrating Use Case 100 (UC-100). LEONSEGS provides the capability to request images from external catalogues, which may belong to various Earth Observation (EO) missions such as Sentinel-1, Sentinel-2, Landsat, Aistech, Satellogic, or other commercial providers. These external catalogues are managed outside of LEONSEGS and contain EO data from different sources.