healow Patient-Centric FHIR API
Patient-facing FHIR R4 APIs accessible through the healow developer portal, letting third-party applications connect to the healow network for clinical data and scheduling. Served by the same eCW FHIR Facade build and the same authorization server as the provider-facing API, with 17,291 activated practice endpoints published in the healow service base URL directory. Read scopes conform to US Core 3.1.1 (USCDI v1) and US Core 6.1.0 (USCDI v3). A published FHIR rate limit of 250 calls per minute per practice-code base URL took effect 7 October 2025.