The REST API Access page can be accessed via the Configure button in the top left corner and then selecting REST API Access. This page shows you all the projects, categories and tables and allows you to share them or revoke sharing.
You can also open an exMonDM table, switch to the Advanced tab and select the Share button to do the same thing for that table.
Caution: A shared table will be accessible by anyone with the link.
Why REST API?
SQL is in most cases the best way to access exMonDM data but when using SQL is infeasible REST API offers a solid alternative.