Maximo APIs are grouped into modules based on the functional aspect of the software they cater to.
Here is the link to the list of all modules and then proceed with swagger to open one by one based on the need/requirements.
https://localhost/maximo/maximomodules.jsp
or use direct link to open selected API in swagger with actions =1 or 0 for no
https://localhost/maximo/oas3/api.html?module=PURCHASE&includeactions=0