T95229 has established a general-purpose /api/ hierarchy, which is currently used by RESTBase at /api/rest_v1/. Before we announce this as the primary RESTBase entry point & dreprecate rest.wikimedia.org, it would be nice to provide some niceties like a simple HTML listing at /api/. We expect the number of APIs to be small, so a manually maintained HTML page should be fine.
@BBlack, do you have a preference for how we should go about this?