We have great news for you!
You now have access to the Medicare Advantage Optum Formulary API.
The Optum Formulary API link is here. https://fhir.shn.flexorx.optum.com/R4
You will need this subscription key: d705ad40-aff0-422c-ad21-28efa3cf3754
This is sensitive information, so please ensure that it is kept safe.