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 7 Complete, well-documented, and agent-ready

Elation Health Appointments APIScheduling and appointment management84.1 Elation Scheduling APIManage appointments, appointment types, and provider schedules for a practice via the Elation API v2.0.84.1 athenahealth Appointments APIThe Appointments API from athenahealth — 6 operation(s) for appointments.79.2 Zocdoc appointments APIEndpoints for booking, cancelling, and rescheduling appointments, including retrieving current appointment ...69.7 Cvent Event Cloud Appointments APIAn appointment is a meeting scheduled between two or more parties. These APIs allow you to get information ...69.6 Healthie GraphQL APIThe Healthie GraphQL API is the single contract behind the entire Healthie platform — the same API that pow...68.5 Vim Appointments APIREST endpoint returning future appointment data (a 10-day lookahead) for a Vim organization. OAuth 2.0 clie...68.2

Strong 7 Solid coverage with minor gaps

Tebra Appointments APISOAP operations for scheduling - GetAppointment, GetAppointments, CreateAppointment, UpdateAppointment, Upd...62.2 Jane Appointments APIRetrieve and list one-on-one appointment bookings for a clinic, with filtering by patient, staff member, lo...61.0 Jane JDP APIJane JDP API from Jane — 31 path(s) described in OpenAPI.61.0 Coperniq appointments APIThe appointments API from Coperniq — 2 operation(s) for appointments.58.1 TELUS Health CHR Enterprise APIThe TELUS Health Collaborative Health Record (CHR) Enterprise API is a GraphQL interface onto the CHR ambul...55.7 Qminder Appointments APIManage scheduled appointments55.4 Microsoft Bookings APIManage customer bookings, appointment scheduling, business services, and staff information for enterprise a...54.8

Developing 18 Usable, with meaningful gaps to close

ServiceTitan Appointments APIJob appointments and visits53.5 Artera Extended Data APIA Marketplace-vendor API that attaches custom partner content to a patient's upcoming or past appointment o...53.1 NexHealth Appointments APIA booking on the Practice's calendar52.4 Semble Scheduling & Bookings APIGraphQL surface for appointments and scheduling — bookings, bookings-by-id, availabilities, availability ru...52.2 Zoom Scheduler APIThe Zoom Scheduler API enables developers to schedule, manage, and retrieve details about meetings, webinar...51.1 Booksy Public APIThe Booksy Public API is a partner-facing REST API for managing Booksy businesses and their booking data. I...50.7 AutoLeadStar Appointments APIOperations related to appointments49.5 Luma Health Scheduling & Appointments APISelf-service scheduling, appointment lifecycle, appointment types, provider availabilities, schedulers, off...48.9 Acuity Scheduling Appointments APIThe Appointments API from Acuity Scheduling — 3 operation(s) for appointments.46.0 Alleva Appointments APIThe Appointments API from Alleva — 4 operation(s) for appointments.45.9 Reonic Appointments APIAppointments on Reonic-hosted calendars only. External calendars (Google, Microsoft) cannot be read or writ...44.0 Roivant Sciences Appointments APIAppointment and scheduling data.44.0 Shop-Ware Appointments APIThe Appointments API from Shop-Ware — 4 operation(s) for appointments.43.2 WellnessLiving Appointments APIThe Appointments API from WellnessLiving — 4 operation(s) for appointments.41.9 GP Connect Appointment Management - FHIR APIManage appointments across GP practices. Enables third-party systems to search for available slots, book ap...41.6 Walgreens Appointments APIAppointment scheduling and management41.2 EMIS Partner API (PAPI)The EMIS Partner API (PAPI) is a RESTful JSON API for EMIS-X / EMIS Web integration, exposing appointments,...39.7 NHSD Provider Appointments APIAPI that surfaces real-time appointment availability and booking integration from certified provider bookin...39.5

Thin 32 Limited public surface area

Zoho BookingsThe Zoho Bookings API allows developers to integrate online scheduling and appointment management with thir...38.5 Phorest Appointments APIAppointment lifecycle - list, retrieve, update, cancel, confirm, check in.38.3 Provet Cloud Appointments APIAppointments and online booking.38.1 ezyVet Appointments APIAppointments, types, and statuses. (Modeled.)37.8 Cliniko Appointments APIIndividual appointments and the unified bookings feed.37.7 Dispatch Appointments APIScheduled times at which an assigned technician performs work for a job.37.3 Loadsmart Appointments APIThe Appointments API from Loadsmart — 10 operation(s) for appointments.37.1 Open Dental Appointments APICONFIRMED. Scheduling, slots, and WebSched.36.9 Purplebricks Viewings APIViewing and appointment service: appointments, open days, property access details, per-property and per-use...36.9 Funnel Customer APISingle-customer integration API for the Funnel leasing platform — create prospects in the CRM, schedule pro...36.3 Tenet Healthcare Appointments APIHealthcare appointment scheduling and management (FHIR Appointment resource)36.3 TutorCruncher Appointments APIAppointments (individual lessons / sessions).36.3 IntakeQ Appointments APIAppointments, booking settings, and cancellation.36.1 Tekmetric Appointments APIScheduled shop appointments.35.7 PushPress Appointments APIScheduled one-on-one or small-group appointments.35.5 Akute Health Appointments APIThe Appointments API from Akute Health — 4 operation(s) for appointments.35.3 Kareo Appointments APIAppointment scheduling and management33.4 Kareo Integration SOAP APIThe Kareo Integration SOAP API provides a web services interface for integrating third-party applications w...33.4 Spurwing Appointments APIThe Appointments API from Spurwing — 3 operation(s) for appointments.33.0 Freshsales Appointments APIThe Appointments API from Freshsales — 2 operation(s) for appointments.32.4 Microsoft Bookings Appointments APIThe Appointments API from Microsoft Bookings — 3 operation(s) for appointments.31.8 Shopmonkey Appointments APISchedule, search, confirm, cancel, and update appointments.31.8 freshworks Appointments APIManage scheduled appointments and meetings.31.6 Vagaro Appointments APIAppointment status, timing, and service-provider details. Endpoints modeled.30.9 samedi Booking APIOAuth2 / OpenID-Connect secured API to discover bookable resources and book and manage patient appointments...30.5 Acuity Scheduling Appointments APIThe Appointments API from Acuity Scheduling — 2 operation(s) for appointments.29.5 Acuity Scheduling WebhooksAsyncAPI 2.6 definition for Acuity Scheduling's outbound webhook surface. Models the documented appointment...29.5 Nookal Appointments APIAppointments, class bookings, availabilities, and the waiting list.29.2 Vetspire Schedule & Appointments APIGraphQL operations over the Schedule domain - list appointments for a location and date range, read provide...28.9 Sollis Health Member Portal APIFirst-party backend API for the Sollis Health Member Portal (mp.sollishealth.com), the members-only web app...28.7 Digitail Appointments APIThe Appointments API from Digitail — 3 operation(s) for appointments.28.6 Karaz APIEarly-stage REST API for the Karaz platform exposing Karaz App resources (e.g. gamification Badges) and Kar...26.2

Emerging 16 Early or largely undocumented

Boulevard Admin API - Appointments, Staff & LocationsRead and sync appointment, staff, and location data across a business's calendar - past, current, and futur...26.1 Updox Reminders APISchedule and manage appointment reminders and broadcast messages across text, voice, and email, with Remind...25.2 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 GP Connect APIGP Connect APIs allow authorised clinical systems to view and book GP services. The APIs provide structured...24.3 SystmOne Patient Facing Services (PFS) APITPP's Patient Facing Services API, enabling patient-facing applications to interact with SystmOne for servi...23.1 AutoLeap Appointments APICreate and bulk-update scheduled appointments, plus a separate appointment-requests flow (create requests, ...21.8 Glofox Bookings APICreate and manage a member's booking - the record of intent to attend a scheduled Event - governed by avail...21.8 Uber Freight Scheduling APIScheduling API implementing the Scheduling Standards Consortium (SSC) Technical Standard for automated dock...21.3 Dentrix Appointments & Scheduling APIRead the schedule and book, reschedule, or cancel appointments. In the Dentrix Developer Program this maps ...20.2 FieldEdge Dispatch & Scheduling APIRead and manage appointments on the dispatch board - assigning jobs to technicians and viewing scheduled wo...16.1 SimplePractice Enterprise Scheduling APIPartner-only integration announced by SimplePractice Enterprise (September 2022) that connects to overlappi...15.5 Reynolds Service and Repair Orders APIService department data - repair orders, labor operations, and appointments - in the Reynolds DMS. Certifie...15.2 TherapyNotes Scheduling API (Modeled)Modeled capability area for appointments, recurring schedules, and reminders. TherapyNotes offers native on...14.1 Denticon Appointments APIRead appointments on the schedule, query open scheduling availability, and book, confirm, reschedule, or ca...12.8 Mend Appointments and Scheduling APILogical grouping for creating and managing appointments, provider availability, patient self-scheduling, re...11.9 tab32 Schedule APIAccess to the tab32 schedule data object - appointments, availability, and booking - supporting online book...11.1

Minimal 4 Almost no public developer surface

Phreesia Scheduling & Appointments APIAppointment scheduling, reminders, and contactless mobile/kiosk check-in, driving arrival status back into ...9.2 Appointment Management APIBook, amend, and cancel engineer appointment slots for wholesale broadband and voice provisioning workflows.8.5 Clearwave Scheduling APIOnline and self-service appointment scheduling where every booking, cancellation, and reschedule syncs auto...6.7 Examity Appointments (Scheduling) APICreate, reschedule, and cancel proctoring appointments for a test-taker against a registered exam, and quer...4.0

Score breakdown

Frequency

62.7

log-scaled weighted occurrences

Breadth

2.7

spread across providers

Quality lift

44.0

mean composite of providers using it

Cohesion

18.0

strength of nearest seed neighbor

Where this tag comes from

Api tag83

Provider tag34

Openapi tag39

Openapi op tag204

Cohort brief

Auto-generated

The 100 providers in the APIs.io catalog tagged Appointments, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

100

all scored

Mean Kin Score

35.6

+14.9 vs catalog 20.7

Mean Agent Readiness

19.1

+9.4 vs catalog 9.7

Spread

3.3–84.1

median 36.3 · σ 18.8

How the 100 split by band

Exemplar 8Strong 6Developing 23Thin 33Emerging 19Minimal 11

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	35.1	17.5	+17.6	100
Access Clarity	39.3	22.3	+17	100
Operational Transparency	24	11.3	+12.7	100
Developer Ergonomics	30.2	17.9	+12.3	100
Discoverability	71.7	60.4	+11.3	100
Contract Governance	10.6	6.4	+4.2	100

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)	25%	16%	+9
MCP server (first-party)	7%	7%	0
Agent Skills	0%	0%	0
OAuth scopes	25%	9%	+16
Security	100%	88%	+12
Arazzo workflows	4%	2%	+2
Governance rules	17%	13%	+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 Elation Health 84.1
2 drchrono 83.5
3 athenahealth 79.2
4 eClinicalWorks 74.9
5 Zocdoc 69.7
6 Cvent Event Cloud 69.6
7 Healthie 68.5
8 Vim 68.2
9 Tebra 62.2
10 Jane 61

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Tools for tags

7 MCP tools reach this

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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

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As a scored cohort

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The distribution (Pro)

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  -H "X-API-Key: $APIS_IO_KEY"

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Appointments

Providers using this tag (100)

APIs with this tag (84)