Right now, the Wikisource OCR service is using an API proxy hosted on Wikimedia Cloud Services. This is problematic both from a reliability and privacy perspective (since Wikisource OCR is already a default tool on some Wikisources and soon will be on many more). We need to move to an API proxy that is hosted on a production server.
The Language team is already using an API proxy that is on a production server: cxserver.wikimedia.org. This proxy already handles sending requests to the Google Cloud API (among other APIs) and thus we may be able to share use of that server or set up a very similar service. The Language team's service was set up by @akosiaris from SRE and @KartikMistry on the Language team.