Open Access Flag for Open Access Content
Open Access Content in Primo Central should be marked with an open access flag in the search or the facet section.
As a result it should be possible to search or filter on open access content regardless of the frontend (Primo or via API).
Thank you for your contribution
We plan to have Open Access indicator & filter in Primo for May 2018 release.
François Renaville commented
There is also already something planned for Primo in 2017:
Enhanced Metadata Quality: Increase population of Open Access indicators and ORCiD
Beate Rajski commented
Looks like Summon already includes this feature:
Summon Open Access Filter