Cloudant on IBM Cloud is CouchDB API/replication compatible and offers support for Apache CouchDB (1). Also, OpenWhisk integrates nicely with CouchDB/Cloudant and can even be a backing persistence for it (2)
They’ve recently shifted their pricing scheme to be more on-demand; before that, you needed to do multi-tenant at very small scale, or buy dedicated clusters.
We have dedicated clusters on Cloudant and they’ve run quite smoothly for many years. Someday we might switch to the on-demand IBM Cloud pricing, but haven’t done it yet.
If you indeed work for Cloudant, please consider trying to convince someone to invest in PouchDB. It looks mostly unmaintained and it would be in IBM's and the community's interest to keep it running!