Invited Alex Reznik and Walter to add content.
ETSI MEC is developing APIs for the Edge in a number of spaces, including Run-time Edge Application Services. A public web site for ETSI MEC is found here: https://www.etsi.org/technologies/multi-access-edge-computing. Among other useful information, the site links to a public overview deck that provides a summary of all the group's activities. The deck is here: Deck Link. The group's portal with full work detail is here ETSI MEC Portal (not all information is publicly accessible on the portal).
All completed APIs - including a number of key Run-time API's are available on the group's OpenAPI hub hosted on ETSI's Forge site https://forge.etsi.org, best accessed via gitlab https://forge.etsi.org/gitlab/mec.
The currently available APIs (as of July 4, 2019) are:
A partial list of relevant Akraino blueprints and projects (accurate as of July 4, 2019)