Asked this question through Mendix Support. Currently there is no public API available.
This is something Mendix is working on and will be released in the (near) future probably.
I asked as well and I was told it should be released along with v10. Beta sometime in April and GA in June.
Has anyone seen the API voor epics already? For as far as I can see it is nog possible at the moment.
Just curious, what are you going to use the Epics API for? :)