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 →

Exemplar 28 Complete, well-documented, and agent-ready

Salesforce Health Cloud APIThe Salesforce Health Cloud API provides FHIR R4-compliant REST APIs and platform APIs for accessing patien...87.5 Medplum Fhir APIThe Fhir API from Medplum — 4 operation(s) for fhir.87.4 Medplum GraphQL APIFHIR-aware GraphQL endpoint at https://api.medplum.com/fhir/R4/$graphql. Supports typed nested queries, rev...87.4 Medplum SubscriptionsFHIR Subscription resources that match a search criteria and dispatch real-time notifications via REST hook...87.4 Elation FHIR R4 APIHL7 FHIR R4 (v4.0.1) API with US Core v5.0.1 and SMART on FHIR 1.0.0 support, used for standards-based inte...83.7 CMS Data at the Point of Care (DPC) APIProvides Original Medicare claims data to fee-for-service Medicare providers in a structured, standardized ...81.3 drchrono SMART on FHIR R4 APIThe ONC-certified SMART on FHIR R4 interoperability API for the DrChrono EHR. Read-only, 27 US Core resourc...80.9 athenaFlex (athenaPractice/athenaFlow) APIFHIR API Server for athenaPractice and athenaFlow products, enabling developers to build integrations with ...76.7 FHIR APIsathenahealth FHIR R4 APIs provide standards-based access to clinical and administrative data. Supports SMAR...76.7 1up Electronic Prior Authorization APICMS-0057-F Electronic Prior Authorization solution automating prior authorization submission and decisionin...75.7 1up FHIR API (DSTU2)1upHealth's managed HL7 FHIR DSTU2 (1.0.2) REST API cloud server, exposing 94 FHIR resource types. Publishe...75.7 1up FHIR API (R4)1upHealth's managed HL7 FHIR R4 (4.0.1) REST API cloud server, exposing 144 FHIR resource types with SMART-...75.7 1up FHIR API (STU3)1upHealth's managed HL7 FHIR STU3 (3.0.2) REST API cloud server, exposing 117 FHIR resource types. Publishe...75.7 1up Patient Access APICMS Patient Access solution delivering member clinical and claims data to patient-authorized third-party ap...75.7 1up Patient ConnectConnectivity solution that acquires patient-authorized clinical records from a national network of EHR/prov...75.7 1up Payer-to-Payer Data Exchange APICMS Payer-to-Payer Data Exchange solution for sharing a member's historical clinical and claims data betwee...75.7 1up Provider Access APICMS Provider Access solution enabling payers to share member data with in-network providers over FHIR, alig...75.7 1up Provider Directory APIPublicly accessible FHIR Provider Directory publishing accurate provider and network listings, aligned to t...75.7 eClinicalWorks FHIR APIProvider-centric, backend and bulk FHIR R4 APIs for integrating with the eClinicalWorks EHR. Supports SMART...74.2 healow Patient-Centric FHIR APIPatient-facing FHIR R4 APIs accessible through the healow developer portal, letting third-party application...74.2 healow RPM Vendor (Tracker) APIBidirectional FHIR R4 API for remote-patient-monitoring device vendors. healow sends signed device orders t...74.2 Flexpa FHIR APIThe FHIR API from Flexpa — 8 operation(s) for fhir.72.4 NextGen Enterprise Patient Access FHIR APIHL7 FHIR API for the NextGen Enterprise EHR, certified under the 21st Century Cures Act Patient Access crit...70.4 NextGen Office FHIR R3 APIHL7 FHIR STU3 (R3) API for the NextGen Office EHR with C-CDA support, authenticated with SMART App Launch /...70.4 Jefferson Health Plans Patient Access FHIR APIThe Jefferson Health Plans (formerly Health Partners Plans) Patient Access FHIR API exposes adjudicated cla...69.8 Thomas Jefferson University Hospital FHIR DSTU2 APIThe legacy Thomas Jefferson University Hospital DSTU2 FHIR endpoint listed in Epic's public R4 endpoint reg...69.8 Canvas Medical FHIR APIA FHIR R4-compliant REST API providing secure access to electronic health record data including 41 FHIR res...67.8 Amigo FHIR APIThe FHIR API from Amigo — 15 operation(s) for fhir.67.2

Strong 30 Solid coverage with minor gaps

Medblocks Platform APIServer-to-server developer API for the Medblocks Platform. Create patients, start hosted PatientSessions th...64.9 xCures Public APIREST API for the xCures Clinical Clarity Engine. Register patients (Subjects), dispatch and poll queries ag...64.2 Epic FHIR Bulk Data Access APIEpic's implementation of the HL7 FHIR Bulk Data Access (Flat FHIR) specification, providing backend system-...64.1 Epic FHIR DSTU2 APIEpic's HL7 FHIR DSTU2 (1.0.2) REST API, published as a FHIR Conformance resource covering the legacy DSTU2 ...64.1 Epic FHIR R4 APIEpic's HL7 FHIR R4 (4.0.1) REST API, aligned to the US Core implementation guides and exposing 59 resource ...64.1 Epic FHIR STU3 APIEpic's HL7 FHIR STU3 (3.0.1) REST API for clinical and administrative resources, authorized with SMART on F...64.1 Nedap Ons APIThe REST API for the Nedap Ons electronic health record suite used by Dutch care organisations. 926 operati...63.4 Aidbox Bulk Data APIFHIR Bulk Data API for large-scale export and import of FHIR resources, including $export, FHIR import/load...61.8 Aidbox FHIR APIAidbox's HL7 FHIR REST API for creating, reading, updating, deleting, and searching clinical and administra...61.8 Redox FHIR APIRedox's modern FHIR API for exchanging clinical and administrative healthcare data across the Redox network...61.8 Redox FHIR R4 APIThe Redox FHIR R4 API exposes HL7 FHIR R4 resources for healthcare data exchange between connected systems,...61.8 Optum Interoperability APIs (CMS Patient Access)Optum's payer-side CMS Interoperability and Patient Access (CMS-9115-F) surface — Patient Access, Provider ...61.5 Optum Real (Medical) APIOptum Real point-of-care APIs on the oihub gateway: pre-service eligibility, claim pre-check, claim actions...61.5 Particle Health FHIR APIFHIR R4 resource search and read.61.3 Temple Health FHIR DSTU2 APIThe legacy Temple Health DSTU2 FHIR endpoint listed in Epic's public DSTU2 endpoint registry under the orga...61.1 Veradigm FHIR R4 API (formerly Allscripts)HL7 FHIR R4 (4.0.1) REST API for Veradigm EHR, aligned to USCDI for 21st Century Cures Act patient and prov...60.6 AWS HealthLake FHIR Export APIAsynchronous bulk export API for exporting FHIR R4 resources from a HealthLake data store to Amazon S3. Sup...59.4 AWS HealthLake FHIR Import APIAsynchronous bulk import API for loading FHIR R4 resources from Amazon S3 into a HealthLake data store. Sup...59.4 Cadasto Additional APICadasto's own extension surface on top of openEHR REST, described by the vendor as "Cadasto-specific... Thi...59.4 Fasten OnPremFasten OnPrem is an open-source, self-hosted, personal and family electronic medical record manager written...58.8 Fasten ToolboxStandalone FHIR-based developer tools derived from the main Fasten platform, including catalog browsing, di...58.8 fhir-reactMIT-licensed React component library for rendering FHIR resources, useful for building patient portals and ...58.8 gofhir-modelsApache 2.0 licensed Go client library and generated FHIR resource models used by Fasten's services to parse...58.8 Halo Connect FHIR APIQuery practice data using FHIR resources.57.0 Veradigm FHIR R4 APIThe Veradigm FHIR R4 API provides RESTful access to clinical, demographic, and facility data using the HL7 ...56.6 Veradigm Paragon Open APIThe Paragon Open API provides FHIR-compliant access to data from the Veradigm Paragon acute care EHR platfo...56.6 b.well Application APIsFederated GraphQL gateway plus REST endpoints that let end-user applications read and write a person's heal...56.0 b.well FHIR ServerSystem-level FHIR R4 API over b.well's normalized clinical data store, built on the open-source Helix FHIR ...56.0 AdvancedMD FHIR Bulk JWKS APIDeveloper-portal helper API that mints JWT client assertions for testing the FHIR Bulk Data workflow. Docum...54.5 AdvancedMD FHIR Endpoint DirectoryPublic, unauthenticated service base URL publication required of ONC-certified API suppliers. GET https://p...54.5

Developing 52 Usable, with meaningful gaps to close

Commure EHR FHIR APIONC (g)(10)-certified, US Core 6.1.0-compliant FHIR R4B server exposing patient health data from Air to aut...53.6 DIPS FHIR R4 APIThe DIPS HL7 FHIR R4 API exposes core clinical and administrative data from the DIPS Arena EHR — Patient, P...53.0 Cloud Healthcare FHIR APIThe Cloud Healthcare FHIR API provides a fully managed implementation of the HL7 FHIR standard (supporting ...52.9 Commure FHIR APIThe FHIR API from Commure — 49 operation(s) for fhir.52.3 Elevance Health Formulary APIThe Formulary API publishes drug coverage for Elevance-affiliated Medicare, Medicaid and CHIP plans — cover...50.6 Elevance Health Patient Access APIThe Patient Access API gives Elevance Health members, through an application they authorize, up to five yea...50.6 Elevance Health Provider Directory APIThe Provider Directory API exposes which practitioners and organizations are in-network for a given Elevanc...50.6 Best Practice Software FHIR APIQuery practice data using FHIR resources.50.5 Zus Health FHIR APIGeneral FHIR R4 resources.50.4 PointClickCare FHIR APIPointClickCare FHIR API provides HL7 FHIR-compliant access to resident clinical data for post-acute and lon...49.2 Electronic Prescription Service (EPS) - FHIR APINational service for sending electronic prescriptions from prescribers to dispensers (pharmacies), exposed ...49.1 GP Connect Access Record - Structured - FHIR APILets authorised health and social care staff retrieve a patient's GP practice record as structured HL7 FHIR...49.1 Personal Demographics Service (PDS) - FHIR APINational electronic database of NHS patient demographic details - name, address, date of birth, related peo...49.1 Predoc Partner APIREST API for retrieving, aggregating, and delivering structured patient medical records. Covers patient man...48.9 Oracle Health Millennium FHIR DSTU2 APIThe Cerner Millennium DSTU2 FHIR API supports legacy SMART on FHIR applications and integrations with Meani...48.4 Aetna Drug Formulary FHIR APIDa Vinci PDex US Drug Formulary 2.0.0 STU 2 formulary data, delivered as part of the Patient Access API pro...47.5 Aetna Patient Access FHIR APIHL7 FHIR R4 Patient Access API giving Aetna members, through an app they authorize, access to their adjudic...47.5 Aetna Prior Authorization FHIR APIDa Vinci prior-authorization surface built for CMS-0057-F: Coverage Requirements Discovery (STU 2.1) at /co...47.5 Aetna Provider Access FHIR APILaunched in Production on 2026-03-27 under the public-provider-group-fhir product, the Provider Access API ...47.5 Aetna Provider Directory FHIR APIHL7 FHIR R4 Provider Directory API implementing the Da Vinci PDex Plan Net Implementation Guide (upgraded t...47.5 Aetna Realtime Pharmacy Benefit Check APIConsumer Real-Time Pharmacy Benefit Check 1.0.0, launched 2024-12-05, letting members and EHR systems retri...47.5 GP Connect FHIR APIThe FHIR API from GP Connect — 1 operation(s) for fhir.47.5 Carefluence Open API R4The ONC-certified § 170.315(g)(10) Standardized API for Patient and Population Services. A HL7 FHIR R4 (4.0...47.3 MEDITECH Expanse FHIR APIMEDITECH's FHIR API surface for Expanse, exposed to approved developers through the Greenfield Workspace. U...47.3 UC Davis Health FHIR R4 endpointUC Davis Health runs a live HL7 FHIR R4 endpoint on its own domain at emrrp.ucdmc.ucdavis.edu, registered i...47.3 UC Davis Health Systems Integration APIsUC Davis Health Systems Integration offers Epic (EHR), HL7 FHIR and custom SOAP/REST APIs, authenticated wi...47.3 CDC DIBBs Query Connector APIThe DIBBs Query Connector is a FHIR client that lets public health agencies query health care organizations...46.7 TailorMed HL7 & FHIR Data ExchangeTailorMed's HL7 and FHIR integration program for keeping patient, prescription and program data in sync wit...46.0 Centene FHIR Patient Access APIThe Centene FHIR Patient Access API lets members of Centene health plans access their clinical, financial, ...44.6 Centene FHIR Provider Directory APIThe Centene FHIR Provider Directory API exposes in-network provider information for Centene members and the...44.6 Centene Provider RTR - FHIR PDEX Directory APIThe Provider RTR FHIR Payer Data Exchange (PDEX) Directory API delivers provider directory data between pay...44.6 FHIR InfernoAn open-source Python utility that flattens nested HL7 FHIR JSON (bundles / resources) into tabular CSV fil...44.1 PKB Facade FHIR APIHL7 FHIR STU3 (3.0.2) "Facade" server exposing Patients Know Best personal health record data — Patient, Ap...43.9 Booking and Referral - FHIR APISend booking and referral information between NHS service providers following the NHS Booking and Referral ...42.6 e-Referral Service - FHIR APIInteract with the NHS e-Referral Service (e-RS), the national paperless referral system for primary and sec...42.6 Electronic Prescription Service - FHIR APITransmit electronic prescriptions between prescribers and community dispensers. Prescribers can create, enc...42.6 GP Connect Appointment Management - FHIR APIManage appointments across GP practices. Enables third-party systems to search for available slots, book ap...42.6 Immunisation History - FHIR APIRetrieve a patient's immunisation history recorded in NHS national systems. Supports clinical decision-maki...42.6 National Record Locator - FHIR APILocate and access patient information shared by other NHS healthcare organisations to support direct patien...42.6 NHS App APIEngage with users of the NHS App, enabling healthcare organisations and suppliers to send in-app messages, ...42.6 Personal Demographics Service - FHIR APIAccess the national NHS patient demographic database. Supports search, retrieval, and update of patient rec...42.6 Spine Directory Service - FHIR APIQuery the Spine Directory Service (SDS) to look up endpoint information, organisation codes, and service me...42.6 Summary Care Record - FHIR APIAccess a patient's Summary Care Record (SCR), a national electronic record of key clinical information deri...42.6 Nabla Core APIThe Nabla Core API transcribes medical encounters, generates structured clinical notes (for example SOAP), ...42.2 VivaLNK FHIR APIHL7 FHIR R4 resources for EHR/CTMS interoperability.42.2 HL7 FHIR R5 Healthcare APIHL7 FHIR R5 (Release 5) is the current published FHIR standard for healthcare data exchange. FHIR R5 REST A...42.1 SMART on FHIR AuthenticationSMART on FHIR (v2.2.0) defines OAuth 2.0-based authorization patterns for client applications to authorize,...42.1 Surescripts Medication History for Populations FHIR APIPublicly documented HL7 FHIR Release 4 API for retrieving medication history panels and near-real-time Pres...41.1 Health Care Costs and Coverage API (FHIR)Provides access to health care expense data for VA patients including medical charges, services received, a...40.1 Patient Health API (FHIR)Allows Veterans and authorized third parties to access patient health data using the HL7 FHIR R4 standard, ...40.1 Kno2 FHIR APIHL7 FHIR (DSTU3/R4) resource query and retrieval at scale, including USCDI data classes and patient demogra...39.9 AmeriHealth Caritas Formulary FHIR APIHL7 FHIR R4 Formulary API published to satisfy CMS-9115-F drug formulary publication requirements for Medic...39.8

Thin 33 Limited public surface area

NHSD FHIR APIReal-time, read-only HL7 FHIR API over the National Health Services Directory, aligned to the HL7 AU Provid...38.4 NHSD FHIR Bulk Data ExportRead-only HL7 FHIR bulk data export for retrieving large NHSD datasets at a specified frequency, for integr...38.4 NHSD FHIR Ingestion & Data Acquisition HubHL7 FHIR write/inbound interface for approved data-contributing sources to submit and maintain health servi...38.4 Curana Health Interoperability APIStandards-based FHIR R4 (4.0.1) Patient Access API published for CMS-9115-F / ONC 21st Century Cures Act co...36.1 Humana FHIR Coverage and Benefits APIFHIR R4-compliant API surface for insurance coverage data, including Coverage, ExplanationOfBenefits, and I...36.1 Humana FHIR Medication APIFHIR R4-compliant API surface for medication-related resources including Medication, MedicationKnowledge, M...36.1 Humana FHIR Provider Directory APIFHIR R4-compliant API surface for provider directory information, including Patient, Practitioner, Practiti...36.1 EPS Prescription Tracker - FHIR APIReal-time tracking of prescriptions within the Electronic Prescription Service. Enables authorised users to...35.7 GP Connect Access Document - FHIR APIRetrieve documents held at a patient's registered GP practice, such as letters, discharge summaries, and ot...35.7 VA Patient Health API (FHIR)Veteran-authorized SMART-on-FHIR API exposing the patient's own health record.35.3 League Platform APIThe League platform API, served from the Kong-fronted gateway at api.league.com. Unauthenticated requests r...34.5 Select Medical FHIR DSTU2 APILegacy HL7 FHIR DSTU2 (1.0.2) endpoint operated by Select Medical on the same Epic platform, registered as ...34.5 Select Medical FHIR R4 APILive HL7 FHIR R4 (4.0.1) patient-access API operated by Select Medical on its Epic platform (community et09...34.5 My Health Record FHIR Gateway (B2B)The business-to-business FHIR Gateway for connecting conformant clinical software to the My Health Record n...33.9 My Health Record FHIR Mobile GatewayThe FHIR Mobile Gateway lets mobile and consumer applications connect to the My Health Record system to ret...33.9 NCTS FHIR Terminology ServerThe National Clinical Terminology Service (NCTS) FHIR terminology server, operated by ADHA on CSIRO Ontoser...33.9 NCTS National Syndication ServerThe NCTS National Syndication Server, an Atom Publishing Protocol profile for interrogating terminology con...33.9 Cohere Health Coverage Requirements Discovery (CRD) APIHL7 Da Vinci Coverage Requirements Discovery (CRD) FHIR API that lets a provider system instantly verify wh...33.0 Cohere Health Documentation Templates and Rules (DTR) APIHL7 Da Vinci Documentation Templates and Rules (DTR) FHIR API that intelligently gathers and submits the do...33.0 Cohere Health Prior Authorization Support (PAS) APIHL7 Da Vinci Prior Authorization Support (PAS) FHIR API that submits an authorization request and returns t...33.0 Community Health Systems Provider Directory APIFHIR R4 read API exposing provider and pharmacy directory data in compliance with CMS interoperability requ...31.5 Rhapsody Guardian (Healthcare API Gateway)Rhapsody Guardian is a healthcare-purpose-built API gateway, launched October 2025, that lets healthcare or...31.3 Rhapsody Integration EngineRhapsody's flagship healthcare integration engine, connecting systems across FHIR, HL7 v2, REST, CDA, X12/E...31.3 Rhapsody Semantic (Terminology Management)Rhapsody Semantic terminology management and data standardization services (code-system mapping, LOINC/SNOM...31.3 WellSky FHIR APIFHIR R4-compliant API built on the US Core Implementation Guide, providing read access to patient health da...29.9 WellSky Hospice and Palliative APIFHIR R4 interoperability API for EHR partners integrating with WellSky's Consolo hospice and palliative car...29.9 WellSky Personal Care Connect APIFHIR-compliant API for WellSky Personal Care software platform enabling data integration and interoperabili...29.9 LKCloud FHIR R4 APIHL7 FHIR R4 RESTful API (read/search/create/update/delete across R4 resources) over the ELLKAY interoperabi...28.5 Amwell Converge Platform APIAmwell's Converge platform REST APIs, which Amwell states leverage HL7 FHIR and single sign-on, let partner...27.4 Amwell EHR IntegrationAmwell's verified embedded-telehealth integration for Epic, delivered through the Epic App Orchard, and its...27.4 HL7 FHIRFast Healthcare Interoperability Resources (FHIR) is HL7's standard for health care data exchange. The curr...27.4 SMART on FHIRAn open-spec authorization profile layered on top of FHIR that enables third-party clinical applications to...27.4 Firely Server FHIR REST APIEvery Firely Server (formerly Vonk) instance exposes the standard HL7 FHIR REST API contract — type-level a...27.1

Emerging 22 Early or largely undocumented

Telstra Health Smart API+FHIR-native integration gateway from Telstra Health that provides a single, standardized interface for appr...25.8 GP Connect (FHIR)GP Connect is NHS England's national FHIR-based interoperability programme. TPP SystmOne clinical records a...24.5 e-Referral Service (e-RS) FHIR APIThe NHS e-Referral Service combines electronic booking with a choice of place, date and time for first hosp...24.3 Electronic Prescription Service (EPS) FHIR APIThe Electronic Prescription Service enables prescribers to send prescriptions electronically to a dispenser...24.3 GP Connect APIGP Connect APIs allow authorised clinical systems to view and book GP services. The APIs provide structured...24.3 NHS England API PlatformThe NHS England API platform hosts a catalogue of national APIs for health and care, including FHIR and RES...24.3 Personal Demographics Service (PDS) FHIR APIThe Personal Demographics Service is the national electronic database of NHS patient demographic details su...24.3 apps.health EMR Integration (FHIR)apps.health is WELL Health's digital health marketplace through which third-party apps and services integra...24.1 Connect24 FHIR APIConnect24 is CODE24's data-transformation service. CODE24 documents it as using a FHIR REST API for reading...23.0 MHS Genesis SMART on FHIR APIMHS Genesis, the Department of Defense electronic health record built on Oracle Health (Cerner), exposes a ...22.0 Axxess All Data Request APICEHRT-certified API (§ 170.315(g)(9)) supporting CCDS C-CDA comprehensive data requests, allowing full pati...19.6 Axxess Data Category Request APICEHRT-certified API (§ 170.315(g)(8)) for categorical patient data retrieval, supporting structured data ac...19.6 Axxess Patient Selection APICEHRT-certified API (§ 170.315(g)(7)) for patient data selection, enabling authorized access to patient rec...19.6 Tempus EHR IntegrationTempus integrates genomic test ordering and results into clinical workflows using near real-time connection...16.2 Labcorp FHIR APILabcorp supports HL7 FHIR-based exchange of laboratory orders, results, and diagnostic reports with provide...14.1 NHS Ambulance Data Submission FHIR APIUse this API to submit ambulance data to the NHS Data Processing Service (DPS) so that it can be made avail...13.4 Labcorp FHIR APILabcorp supports HL7 FHIR-based exchange of laboratory orders, results, and diagnostic reports with provide...13.3 Solv EHR Interoperability APIBidirectional interoperability layer that automatically syncs patient demographics, appointment details, an...12.5 Amazing Charts APIAmazing Charts is an EHR product within Harris Ambulatory Care Enterprise that exposes a §170.315(g)(10) ON...11.8 CareTracker APICareTracker is a Harris Ambulatory Care Enterprise EHR product that provides a §170.315(g)(10) ONC Certifie...11.8 Pulse FHIR APIThe Pulse §170.315(g)(10) ONC Certified FHIR API enables third-party application developers to register, au...11.8 Smile CDR FHIR EndpointThe core FHIR REST API exposed by every Smile CDR FHIR Endpoint module. Supports the full FHIR REST interac...11.5

Minimal 8 Almost no public developer surface

Phreesia Intake & Forms APIDigital intake, consent, and clinical questionnaire capture - logic-driven interviews customized per patien...9.2 Phreesia Registration & Demographics APIBidirectional patient registration and demographic data exchange - verify and update patient identity, cont...9.2 Sectra FHIRcast InterfaceClinical context synchronization using the FHIRcast standard, which Sectra helped originate (with Epic) and...8.5 CVS Health Partner IntegrationsCVS Health does not publish a unified public REST API or developer portal. Pharmacy, PBM, and Aetna integra...7.9 Kaiser Permanente Patient Access FHIR APIKaiser Permanente provides a patient access FHIR API supporting the CMS Interoperability and Patient Access...7.0 Visage 7 AI Open APIOpen API for integrating third-party and customer AI algorithms into the Visage 7 platform and Visage AI Ac...6.7 Visage 7 HL7 / FHIR Interoperability APIHL7 v2 messaging and FHIR-based interoperability for order/result and imaging-context exchange between Visa...6.7 UPMC Health Plan ONC 21st Century Cures Act Developer APIThe UPMC Health Plan Developer API is the payer-side FHIR API mandated by the ONC 21st Century Cures Act an...6.4

Companies reaching this through an API (8)

These companies publish an API, specification or operation carrying “FHIR” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Centers for Disease Control and Prevention Department of Veterans Affairs (VA) National Health Service Salesforce Tempus AI Troy Medicare University of California, Davis VivaLNK

Score breakdown

Frequency

69.4

log-scaled weighted occurrences

Breadth

4.7

spread across providers

Quality lift

44.1

mean composite of providers using it

Cohesion

47.3

strength of nearest seed neighbor

Where this tag comes from

Provider tag170

Api tag176

Openapi tag8

Openapi op tag58

Cohort brief

Auto-generated

The 168 providers in the APIs.io catalog tagged FHIR, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

168

all scored

Mean Kin Score

39.3

+15.4 vs catalog 23.9

Mean Agent Readiness

20.6

+8.6 vs catalog 12

Spread

1.8–87.4

median 39.7 · σ 19.6

How the 168 split by band

Exemplar 15Strong 27Developing 43Thin 35Emerging 35Minimal 13

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	38.9	23.4	+15.5	168
Contract Quality	31.9	19.8	+12.1	168
Access Clarity	37.4	26.5	+10.9	168
Operational Transparency	24	14	+10	168
Contract Governance	15.2	6.4	+8.8	168
Discoverability	67.7	61.2	+6.5	168

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	13%	10%	+3
MCP server (first-party)	14%	13%	+1
Agent Skills	0%	0%	0
OAuth scopes	43%	11%	+32
Security	99%	97%	+2
Arazzo workflows	5%	2%	+3
Governance rules	18%	14%	+4

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 Medplum 87.4
2 Elation Health 83.7
3 Centers for Medicare and Medicaid Services 81.3
4 drchrono 80.9
5 athenahealth 76.7
6 1upHealth 75.7
7 eClinicalWorks 74.2
8 Flexpa 72.4
9 NextGen Healthcare 70.4
10 Jefferson Health 69.8

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.

All 92 tools →

Call it yourself

curl for this page

This tag

curl "https://apis.io/api/v1/tags/fhir"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/fhir"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/fhir/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

FHIR

Providers using this tag (170)

APIs with this tag (173)