Zus FHIR GraphQL API (FQS)
The Zus FHIR Query Service (FQS) is a read-only GraphQL API over the FHIR data model, exposed at a single endpoint. Supports UPID-scoped (one-human) and builder-scoped queries across resource types in the Designated Record Set. Uses the same OAuth 2.0 bearer token as the REST API. Beta.