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 11 Complete, well-documented, and agent-ready

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...84.1 drchrono SMART on FHIR R4 APIThe ONC-certified SMART on FHIR R4 interoperability API for the DrChrono EHR. Read-only, 27 US Core resourc...83.5 FHIR APIsathenahealth FHIR R4 APIs provide standards-based access to clinical and administrative data. Supports SMAR...79.2 Canvas LTI Advantage Services1EdTech (IMS Global) LTI 1.3 / LTI Advantage implementation. Includes Deep Linking 2.0, Names and Role Prov...76.2 1up FHIR API (DSTU2)1upHealth's managed HL7 FHIR DSTU2 (1.0.2) REST API cloud server, exposing 94 FHIR resource types. Publishe...76.0 1up FHIR API (R4)1upHealth's managed HL7 FHIR R4 (4.0.1) REST API cloud server, exposing 144 FHIR resource types with SMART-...76.0 1up FHIR API (STU3)1upHealth's managed HL7 FHIR STU3 (3.0.2) REST API cloud server, exposing 117 FHIR resource types. Publishe...76.0 1up Patient ConnectConnectivity solution that acquires patient-authorized clinical records from a national network of EHR/prov...76.0 1up Population Connect (Bulk FHIR)Population-scale connectivity and Bulk Data (Flat FHIR) export solution for acquiring and computing over la...76.0 NextGen Mirth Connect Integration Engine APIAPI for NextGen Mirth Connect, an open-source healthcare integration engine supporting HL7 v2, FHIR, and ot...75.7 API Evangelist StandardsCommon Internet or industry standards used to consistently define API operations and keep the API factory f...69.8

Strong 12 Solid coverage with minor gaps

Optum Insight Platform (Platform and Interoperability) APIOptum Insight Platform services published on gateway.optuminsightplatform.com: NCC data acquisition, a code...63.4 Optum Interoperability APIs (CMS Patient Access)Optum's payer-side CMS Interoperability and Patient Access (CMS-9115-F) surface — Patient Access, Provider ...63.4 Aidbox FHIR APIAidbox's HL7 FHIR REST API for creating, reading, updating, deleting, and searching clinical and administra...63.2 Redox Data Model APIRedox's legacy event-based Data Model API (Redox Messages) for exchanging structured healthcare data across...62.1 Redox FHIR APIRedox's modern FHIR API for exchanging clinical and administrative healthcare data across the Redox network...62.1 Autodesk Data Exchange APIThe Data Exchange API enables seamless sharing of complete or selective 3D model data across BIM, CAD, and ...60.2 Halo Cloud API for Desktop ApplicationsThe Halo Cloud API for desktop applications, exposing a token endpoint plus SQL passthrough, FHIR R4 resour...59.7 Halo Cloud API for IntegratorsThe Halo Cloud API for third-party software integrators to query on-premise practice management system data...59.7 Halo Cloud FHIR APIHalo Connect's FHIR API for accessing primary-care data from on-premise practice management systems, based ...59.7 AdvancedMD FHIR Endpoint DirectoryPublic, unauthenticated service base URL publication required of ONC-certified API suppliers. GET https://p...58.3 b.well FHIR ServerSystem-level FHIR R4 API over b.well's normalized clinical data store, built on the open-source Helix FHIR ...58.0 Commure EHR FHIR APIONC (g)(10)-certified, US Core 6.1.0-compliant FHIR R4B server exposing patient health data from Air to aut...56.5

Developing 19 Usable, with meaningful gaps to close

FHIR API for Bp PremierThe HL7 FHIR API for Best Practice Bp Premier, delivered through Halo Connect. Built to the AU Base 4.1.0 i...53.2 Halo Cloud API for IntegratorsThe integrator-facing Halo Cloud API from Best Practice's Halo Connect platform. Lets approved partners que...53.2 PointClickCare FHIR APIPointClickCare FHIR API provides HL7 FHIR-compliant access to resident clinical data for post-acute and lon...51.3 Eikon Side by Side Interoperability APIWeb API for integrating standalone desktop applications with Refinitiv Eikon to create dynamic custom workf...50.6 Workspace Web Side by Side APIAPI enabling interoperability and context passing between LSEG Workspace Web and external web applications ...50.6 Agent Connect Protocol (ACP)A standard REST interface for invoking and configuring remote agents: agent discovery and descriptors, stat...47.6 Google Cloud Storage XML APIAmazon S3-compatible XML API for Google Cloud Storage.47.3 Tuva ConnectorsA family of open-source dbt connector projects (Medicare CCLF, BCDA, CMS synthetic, Aetna, BCBS, and a conn...47.0 FDC3 Desktop Agent BridgingFDC3 Desktop Agent Bridging (DAB) is a wire protocol that enables multiple Desktop Agent implementations to...46.4 FDC3 IntentsFDC3 Intents are standardized verbs that applications use to request functionality from other applications ...46.4 PKB Facade FHIR APIHL7 FHIR STU3 (3.0.2) "Facade" server exposing Patients Know Best personal health record data — Patient, Ap...45.0 HL7 FHIR R5 Healthcare APIHL7 FHIR R5 (Release 5) is the current published FHIR standard for healthcare data exchange. FHIR R5 REST A...43.8 Infoway FHIR Terminology Service APIHL7 FHIR R4 (4.0.1) terminology service from Canada Health Infoway's Terminology Gateway (HAPI FHIR), expos...43.4 Workspace Web Side by Side APIInteroperability API that connects client web applications to LSEG Workspace Web. It allows applications to...42.9 Message Exchange for Social Care and Health (MESH) APIExchange messages and data files between NHS organisations using MESH, the national messaging infrastructur...41.6 National Record Locator - FHIR APILocate and access patient information shared by other NHS healthcare organisations to support direct patien...41.6 Surescripts Clinical Direct MessagingProvides secure, HIPAA-compliant clinical message exchange (Direct Secure Messaging) for care coordination ...41.1 Surescripts Record Locator and ExchangeLocates where a patient has clinical records across the network and enables retrieval of relevant clinical ...41.1 EMIS-X App LaunchEMIS-X App Launch lets partner applications be launched in-context from within the EMIS-X / EMIS Web clinic...39.7

Thin 20 Limited public surface area

ONC Health IT Open Data APIThe ONC Health IT Open Data API provides access to open datasets published by the Office of the National Co...37.7 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 Netsmart CareConnect Payer Patient Access APIFHIR R4 API for payer organizations enabling patient-directed access to claims, clinical, and coverage data...34.7 Netsmart CareConnect Provider System Access APIFHIR R4 backend service API for system-to-system integration and asynchronous bulk data export from Netsmar...34.7 Elevance Health Formulary APIThe Formulary API publishes Elevance Health drug coverage information including covered drug lists, tier pl...33.7 Elevance Health Patient Access APIThe Patient Access API enables Anthem and Elevance Health members to securely access and exchange their med...33.7 Elevance Health Payer to Payer APIThe Payer to Payer API enables Elevance Health to exchange member coverage and clinical data with other hea...33.7 Elevance Health Provider Directory APIThe Provider Directory API exposes Elevance Health network provider information including practitioners, pr...33.7 Community Health Systems Provider Directory APIFHIR R4 read API exposing provider and pharmacy directory data in compliance with CMS interoperability requ...32.9 PMC OAI-PMH APIThe PMC OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) API enables systematic harvesti...31.7 Garmin FIT SDKThe Flexible and Interoperable Data Transfer (FIT) protocol is Garmin's compact binary file format for spor...31.6 Corepoint Integration EngineCorepoint healthcare integration engine (from the 2019 Corepoint Health merger), the top-ranked integration...31.3 Rhapsody Axon (AI + MCP)Rhapsody Axon embeds AI into the integration platform and adds Model Context Protocol (MCP) support for AI-...31.3 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 LKCloud Interop APISingle-endpoint healthcare interoperability API exposing proprietary LK* operations (appointments, patient ...29.6 TELUS CHR Enterprise APIGraphQL API for the TELUS Collaborative Health Record (CHR) that lets partners build integrations against c...28.4 TELUS Patient Chart FHIR APITELUS Patient Chart FHIR R4 implementation guide, published by TELUS, containing 89 StructureDefinition pro...28.4 Hyperledger Cacti APIHyperledger Cacti (formerly Cactus) is a pluggable enterprise-grade framework for cross-chain transactions,...26.5 Amwell EHR IntegrationAmwell's verified embedded-telehealth integration for Epic, delivered through the Epic App Orchard, and its...26.3

Emerging 20 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 Updox Direct Messaging APISend and receive HISP Direct secure messages between providers, with Direct Messaging webhooks for delivery...25.2 Packback LTI IntegrationPackback's integration surface is the IMS Global LTI standard (1EdTech certified for LTI 1.0, 1.2, and 1.3 ...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 GP Connect (FHIR)GP Connect is NHS England's national FHIR-based interoperability programme. TPP SystmOne clinical records a...23.1 Interface Mechanism 1 (IM1)The NHS England national integration route by which approved third-party applications connect directly to G...23.1 WellSky FHIR APIFHIR R4-compliant API built on the US Core Implementation Guide, providing read access to patient health da...22.8 Baxter DeviceBridge PlatformBaxter's DeviceBridge is a cloud-based platform that enables secure data transfer from Baxter medical devic...20.4 APEX — Adaptive Payload EXchangeAPEX is Neros Technologies' open, MIT-licensed plug-and-play protocol for connecting drone platforms (hosts...18.5 RSS Best Practices ProfileThe RSS Best Practices Profile is the RSS Advisory Board's normative guidance on producing RSS feeds that i...17.9 ONNXOpen Neural Network Exchange (ONNX) is an open format for representing deep learning models, enabling inter...17.2 Tempus EHR IntegrationTempus integrates genomic test ordering and results into clinical workflows using near real-time connection...16.8 Delta Catalog-Managed TablesCatalog-managed Delta tables delegate table scan planning to an external catalog using the Iceberg REST Cat...16.5 Anthem Patient Access APIThe Anthem Patient Access API provides members access to their personal health data via HL7 FHIR R4, as req...16.4 Anthem Provider Directory APIThe Anthem Provider Directory API provides public access to provider directory information via HL7 FHIR R4,...16.4 Margo SpecificationMargo defines an open standard specification for interoperability of edge applications, devices, and orches...14.3 PocketHealth Image Exchange APIPartner-gated capability, modeled from PocketHealth's public Image Exchange product description. Supports p...13.0 Labcorp FHIR APILabcorp supports HL7 FHIR-based exchange of laboratory orders, results, and diagnostic reports with provide...12.2 Quant Overledger APIOverledger APIs provide a single unified interface for building cross-ledger applications, including endpoi...11.9 Labcorp FHIR APILabcorp supports HL7 FHIR-based exchange of laboratory orders, results, and diagnostic reports with provide...11.4

Minimal 5 Almost no public developer surface

Sectra IHE XDS InterfaceIHE Cross-Enterprise Document Sharing (XDS/XDS-I) interface for registering, querying, and retrieving imagi...8.5 Quanum Data ExchangeQuanum Data Exchange is Quest's interoperability service for delivering laboratory and diagnostic results i...8.1 X-Road (Straumurinn) API CatalogueIceland's X-Road data-exchange layer (Straumurinn). Government-to-government REST services that publish Ope...7.2 Kaiser Permanente Patient Access FHIR APIKaiser Permanente provides a patient access FHIR API supporting the CMS Interoperability and Patient Access...7.0 Visage 7 HL7 / FHIR Interoperability APIHL7 v2 messaging and FHIR-based interoperability for order/result and imaging-context exchange between Visa...6.7

Score breakdown

Frequency

64.2

log-scaled weighted occurrences

Breadth

4.5

spread across providers

Quality lift

41.6

mean composite of providers using it

Cohesion

47.1

strength of nearest seed neighbor

Where this tag comes from

Provider tag139

Api tag87

Cohort brief

Auto-generated

The 164 providers in the APIs.io catalog tagged Interoperability, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

164

all scored

Mean Kin Score

34.3

+13.6 vs catalog 20.7

Mean Agent Readiness

16.4

+6.7 vs catalog 9.7

Spread

3.3–91.3

median 31.7 · σ 20.8

How the 164 split by band

Exemplar 12Strong 18Developing 32Thin 37Emerging 45Minimal 20

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	33.1	17.9	+15.2	164
Operational Transparency	22.2	11.3	+10.9	164
Contract Quality	27.8	17.5	+10.3	164
Access Clarity	31.9	22.3	+9.6	164
Discoverability	69.7	60.4	+9.3	164
Contract Governance	14.6	6.4	+8.2	164

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)	32%	16%	+16
MCP server (first-party)	11%	7%	+4
Agent Skills	0%	0%	0
OAuth scopes	26%	9%	+17
Security	98%	88%	+10
Arazzo workflows	5%	2%	+3
Governance rules	21%	13%	+8

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

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MCP server

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Tools for tags

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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

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The distribution (Pro)

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Interoperability

Providers using this tag (164)

APIs with this tag (87)