US Core
Providers using this tag (11)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 2 Complete, well-documented, and agent-ready
Strong 4 Solid coverage with minor gaps
Developing 2 Usable, with meaningful gaps to close
Thin 1 Limited public surface area
Emerging 1 Early or largely undocumented
Minimal 1 Almost no public developer surface
APIs with this tag (4)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Strong 3 Solid coverage with minor gaps
Epic FHIR R4 APIEpic's HL7 FHIR R4 (4.0.1) REST API, aligned to the US Core implementation guides and exposing 59 resource ...Oracle Health Millennium Platform FHIR R4 APIThe full HL7 FHIR R4 REST surface of Oracle Health Millennium — 44 resource types, 123 operations, derived ...AdvancedMD FHIR Single API (US Core 6.1.0)Read-only HL7 FHIR R4 (4.0.1) API for single-patient data access, aligned to the HL7 FHIR US Core Implement...
Emerging 1 Early or largely undocumented
Score breakdown
Frequency
31.9
log-scaled weighted occurrences
Breadth
0.3
spread across providers
Quality lift
59.2
mean composite of providers using it
Cohesion
8.3
strength of nearest seed neighbor
Related tags
CMS Interoperability 6 co-occurrences
SMART on FHIR 10 co-occurrences
Bulk Data 9 co-occurrences
Patient 5 co-occurrences
Patient Access 6 co-occurrences
HL7 8 co-occurrences
FHIR 11 co-occurrences
EHR 5 co-occurrences
Where this tag comes from
Provider tag10
Api tag4
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for tags
7 MCP tools reach this
find_tagsBrowse and filter every tag in the catalog.get_cohortThis tag as a scored cohort — every provider carrying it, with scores.cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
This tag
curl "https://apis.io/api/v1/tags/us-core"
All tags
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort
curl "https://apis.io/api/v1/cohorts/tag/us-core"
The distribution (Pro)
curl "https://apis.io/api/v1/cohorts/tag/us-core/stats" \
-H "X-API-Key: $APIS_IO_KEY"
Discovery needs no key. Ratings and market analysis are Pro.