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 10 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...77.5 drchrono SMART on FHIR R4 APIThe ONC-certified SMART on FHIR R4 interoperability API for the DrChrono EHR. Read-only, 27 US Core resourc...76.3 1up FHIR API (DSTU2)1upHealth's managed HL7 FHIR DSTU2 (1.0.2) REST API cloud server, exposing 94 FHIR resource types. Publishe...71.7 1up FHIR API (R4)1upHealth's managed HL7 FHIR R4 (4.0.1) REST API cloud server, exposing 144 FHIR resource types with SMART-...71.7 1up FHIR API (STU3)1upHealth's managed HL7 FHIR STU3 (3.0.2) REST API cloud server, exposing 117 FHIR resource types. Publishe...71.7 1up Patient ConnectConnectivity solution that acquires patient-authorized clinical records from a national network of EHR/prov...71.7 1up Population Connect (Bulk FHIR)Population-scale connectivity and Bulk Data (Flat FHIR) export solution for acquiring and computing over la...71.7 FHIR APIsathenahealth FHIR R4 APIs provide standards-based access to clinical and administrative data. Supports SMAR...69.1 Canvas LTI Advantage Services1EdTech (IMS Global) LTI 1.3 / LTI Advantage implementation. Includes Deep Linking 2.0, Names and Role Prov...66.9 NextGen Mirth Connect Integration Engine APIAPI for NextGen Mirth Connect, an open-source healthcare integration engine supporting HL7 v2, FHIR, and ot...66.7

Strong 7 Solid coverage with minor gaps

API Evangelist StandardsCommon Internet or industry standards used to consistently define API operations and keep the API factory f...66.2 Google Cloud Storage XML APIAmazon S3-compatible XML API for Google Cloud Storage.65.0 Autodesk Data Exchange APIThe Data Exchange API enables seamless sharing of complete or selective 3D model data across BIM, CAD, and ...59.9 Aidbox FHIR APIAidbox's HL7 FHIR REST API for creating, reading, updating, deleting, and searching clinical and administra...57.7 Redox Data Model APIRedox's legacy event-based Data Model API (Redox Messages) for exchanging structured healthcare data across...57.7 Redox FHIR APIRedox's modern FHIR API for exchanging clinical and administrative healthcare data across the Redox network...57.7 Optum Interoperability APIs (CMS Patient Access)Optum's payer-side CMS Interoperability and Patient Access (CMS-9115-F) surface — Patient Access, Provider ...56.4

Developing 26 Usable, with meaningful gaps to close

b.well FHIR ServerSystem-level FHIR R4 API over b.well's normalized clinical data store, built on the open-source Helix FHIR ...52.2 Nextworld Platform REST APIInbound REST endpoints into the Nextworld Platform. Every table and logic block created in the platform aut...51.1 AdvancedMD FHIR Endpoint DirectoryPublic, unauthenticated service base URL publication required of ONC-certified API suppliers. GET https://p...51.0 University of Twente Erasmus Without Paper NodeA live Erasmus Without Paper discovery manifest served on a University of Twente hostname, declaring fiftee...50.7 Cloud Healthcare FHIR APIThe Cloud Healthcare FHIR API provides a fully managed implementation of the HL7 FHIR standard (supporting ...50.4 Cambio Open Services FHIR R4 APIHL7 FHIR R4 (4.0.1) server exposing Cambio COSMIC clinical data through 24 FHIR resource types — Patient, P...50.0 Eikon Side by Side Interoperability APIWeb API for integrating standalone desktop applications with Refinitiv Eikon to create dynamic custom workf...49.3 Workspace Web Side by Side APIAPI enabling interoperability and context passing between LSEG Workspace Web and external web applications ...49.3 Delta Catalog-Managed TablesCatalog-managed Delta tables delegate table scan planning to an external catalog using the Iceberg REST Cat...48.0 Oracle Health Data IntelligenceOracle Health Data Intelligence is a comprehensive platform that leverages advanced analytics and artificia...47.9 Commure EHR FHIR APIONC (g)(10)-certified, US Core 6.1.0-compliant FHIR R4B server exposing patient health data from Air to aut...47.4 Elevance Health Formulary APIThe Formulary API publishes drug coverage for Elevance-affiliated Medicare, Medicaid and CHIP plans — cover...45.8 Elevance Health Patient Access APIThe Patient Access API gives Elevance Health members, through an application they authorize, up to five yea...45.8 Elevance Health Provider Directory APIThe Provider Directory API exposes which practitioners and organizations are in-network for a given Elevanc...45.8 Workspace Web Side by Side APIInteroperability API that connects client web applications to LSEG Workspace Web. It allows applications to...45.8 PointClickCare FHIR APIPointClickCare FHIR API provides HL7 FHIR-compliant access to resident clinical data for post-acute and lon...45.1 FDC3 Desktop Agent BridgingFDC3 Desktop Agent Bridging (DAB) is a wire protocol that enables multiple Desktop Agent implementations to...45.0 FDC3 IntentsFDC3 Intents are standardized verbs that applications use to request functionality from other applications ...45.0 Carefluence Open API R4The ONC-certified § 170.315(g)(10) Standardized API for Patient and Population Services. A HL7 FHIR R4 (4.0...44.0 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...42.5 Erasmus Without Paper node (HEI ulisboa.pt)The institution's node in the Erasmus Without Paper network, through which student mobility, inter-institut...42.0 Tuva ConnectorsA family of open-source dbt connector projects (Medicare CCLF, BCDA, CMS synthetic, Aetna, BCBS, and a conn...41.9 PKB Facade FHIR APIHL7 FHIR STU3 (3.0.2) "Facade" server exposing Patients Know Best personal health record data — Patient, Ap...41.8 TailorMed HL7 & FHIR Data ExchangeTailorMed's HL7 and FHIR integration program for keeping patient, prescription and program data in sync wit...41.8 Message Exchange for Social Care and Health (MESH) APIExchange messages and data files between NHS organisations using MESH, the national messaging infrastructur...39.7 National Record Locator - FHIR APILocate and access patient information shared by other NHS healthcare organisations to support direct patien...39.7

Thin 19 Limited public surface area

Surescripts Clinical Direct MessagingProvides secure, HIPAA-compliant clinical message exchange (Direct Secure Messaging) for care coordination ...39.2 Surescripts Record Locator and ExchangeLocates where a patient has clinical records across the network and enables retrieval of relevant clinical ...39.2 HL7 FHIR R5 Healthcare APIHL7 FHIR R5 (Release 5) is the current published FHIR standard for healthcare data exchange. FHIR R5 REST A...39.1 ISIS (Moodle) LTI 1.3 PlatformISIS is TU Berlin's central learning-management system, a Moodle instance on a TU Berlin host. It acts as a...38.0 Atomik openEHR REST APIAtomik is CaboLabs' standardized Clinical Data Repository and Demographic Data Repository. Its REST API imp...37.6 Netsmart CareConnect Payer Patient Access APIFHIR R4 API for payer organizations enabling patient-directed access to claims, clinical, and coverage data...35.7 Netsmart CareConnect Provider System Access APIFHIR R4 backend service API for system-to-system integration and asynchronous bulk data export from Netsmar...35.7 EMIS-X App LaunchEMIS-X App Launch lets partner applications be launched in-context from within the EMIS-X / EMIS Web clinic...34.1 Baxter DeviceBridge PlatformBaxter's DeviceBridge is a cloud-based platform that enables secure data transfer from Baxter medical devic...33.0 Curana Health Interoperability APIStandards-based FHIR R4 (4.0.1) Patient Access API published for CMS-9115-F / ONC 21st Century Cures Act co...32.8 Updox Direct Messaging APISend and receive HISP Direct secure messages between providers, with Direct Messaging webhooks for delivery...30.9 PMC OAI-PMH APIThe PMC OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) API enables systematic harvesti...30.1 Corepoint Integration EngineCorepoint healthcare integration engine (from the 2019 Corepoint Health merger), the top-ranked integration...28.9 Rhapsody Axon (AI + MCP)Rhapsody Axon embeds AI into the integration platform and adds Model Context Protocol (MCP) support for AI-...28.9 Rhapsody Guardian (Healthcare API Gateway)Rhapsody Guardian is a healthcare-purpose-built API gateway, launched October 2025, that lets healthcare or...28.9 Rhapsody Integration EngineRhapsody's flagship healthcare integration engine, connecting systems across FHIR, HL7 v2, REST, CDA, X12/E...28.9 Community Health Systems Provider Directory APIFHIR R4 read API exposing provider and pharmacy directory data in compliance with CMS interoperability requ...28.6 WellSky FHIR APIFHIR R4-compliant API built on the US Core Implementation Guide, providing read access to patient health da...28.0 LKCloud Interop APISingle-endpoint healthcare interoperability API exposing proprietary LK* operations (appointments, patient ...27.1

Emerging 16 Early or largely undocumented

HL7 FHIRFast Healthcare Interoperability Resources (FHIR) is HL7's standard for health care data exchange. The curr...26.0 Amwell EHR IntegrationAmwell's verified embedded-telehealth integration for Epic, delivered through the Epic App Orchard, and its...25.0 Telstra Health Smart API+FHIR-native integration gateway from Telstra Health that provides a single, standardized interface for appr...24.2 ONNXOpen Neural Network Exchange (ONNX) is an open format for representing deep learning models, enabling inter...23.7 GP Connect (FHIR)GP Connect is NHS England's national FHIR-based interoperability programme. TPP SystmOne clinical records a...23.3 Interface Mechanism 1 (IM1)The NHS England national integration route by which approved third-party applications connect directly to G...23.3 apps.health EMR Integration (FHIR)apps.health is WELL Health's digital health marketplace through which third-party apps and services integra...22.5 Packback LTI IntegrationPackback's integration surface is the IMS Global LTI standard (1EdTech certified for LTI 1.0, 1.2, and 1.3 ...22.5 Hyperledger Cacti APIHyperledger Cacti (formerly Cactus) is a pluggable enterprise-grade framework for cross-chain transactions,...22.4 Garmin FIT SDKThe Flexible and Interoperable Data Transfer (FIT) protocol is Garmin's compact binary file format for spor...21.4 APEX — Adaptive Payload EXchangeAPEX is Neros Technologies' open, MIT-licensed plug-and-play protocol for connecting drone platforms (hosts...19.6 Quant Overledger APIOverledger APIs provide a single unified interface for building cross-ledger applications, including endpoi...18.3 Tempus EHR IntegrationTempus integrates genomic test ordering and results into clinical workflows using near real-time connection...15.8 Labcorp FHIR APILabcorp supports HL7 FHIR-based exchange of laboratory orders, results, and diagnostic reports with provide...14.1 Margo SpecificationMargo defines an open standard specification for interoperability of edge applications, devices, and orches...12.7 PocketHealth Image Exchange APIPartner-gated capability, modeled from PocketHealth's public Image Exchange product description. Supports p...12.7

Minimal 5 Almost no public developer surface

Quanum Data ExchangeQuanum Data Exchange is Quest's interoperability service for delivering laboratory and diagnostic results i...8.4 Sectra IHE XDS InterfaceIHE Cross-Enterprise Document Sharing (XDS/XDS-I) interface for registering, querying, and retrieving imagi...8.4 X-Road (Straumurinn) API CatalogueIceland's X-Road data-exchange layer (Straumurinn). Government-to-government REST services that publish Ope...7.4 Kaiser Permanente Patient Access FHIR APIKaiser Permanente provides a patient access FHIR API supporting the CMS Interoperability and Patient Access...7.3 Visage 7 HL7 / FHIR Interoperability APIHL7 v2 messaging and FHIR-based interoperability for order/result and imaging-context exchange between Visa...7.0

Companies reaching this through an API (29)

These companies publish an API, specification or operation carrying “Interoperability” 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.

Score breakdown

Frequency

65.5

log-scaled weighted occurrences

Breadth

4.5

spread across providers

Quality lift

39.6

mean composite of providers using it

Cohesion

52.2

strength of nearest seed neighbor

Where this tag comes from

Provider tag175

Api tag83

Cohort brief

Auto-generated

The 172 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

172

all scored

Mean Kin Score

32.7

+9.8 vs catalog 22.9

Mean Agent Readiness

17.8

+5.9 vs catalog 11.9

Spread

0–79.1

median 30.7 · σ 18.4

How the 172 split by band

Exemplar 7Strong 17Developing 38Thin 40Emerging 47Minimal 23

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	35.5	23.2	+12.3	172
Operational Transparency	22.3	13.7	+8.6	172
Contract Quality	25.8	17.6	+8.2	172
Contract Governance	12.6	6.3	+6.3	172
Discoverability	64.2	58.1	+6.1	172
Access Clarity	32.4	26.5	+5.9	172

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%	14%	-1
MCP server (first-party)	12%	12%	0
Agent Skills	0%	0%	0
OAuth scopes	29%	11%	+18
Security	98%	98%	0
Arazzo workflows	3%	2%	+1
Governance rules	13%	14%	-1

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

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

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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

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This tag

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All tags

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As a scored cohort

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

The distribution (Pro)

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

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Interoperability

Providers using this tag (175)

APIs with this tag (83)