sure, or meters. These are common projections:

- EPSG:3857 Web Mercator

- EPSG:6933 https://nsidc.org/data/user-resources/help-center/guide-ease...

- UTM

You could just support Web Mercator, if normal or swapped are not valid coordinates, assume Web Mercator and check if they are valid coordinates. If they are swapped it will still be in the general area even if the projection is not exactly matching