So smart to make this search on PW. Thanks ! Seems obvious once you told it, but i first believed google was good for search !
I made the search on Programmableweb DB, filtering by Oauth as authentication protocol and i found 389 APIs. It is huge ! Also, for information 663 uses HTTP Basic Auth.
I just wonder now how many different Oauth implementation, (1.0 and 2.0 versions, specs revisions, 2 or 3 legged style) there are in these 389 Oauth APIs.... any smart idea again for looking for this number? :)