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

Amazon Clean Rooms Memberships APIOperations for managing collaboration memberships82.5 AfterShip Memberships APIThe Memberships API from AfterShip — 2 operation(s) for memberships.81.7 Cloudflare Memberships APIThe Memberships API from Cloudflare — 2 operation(s) for memberships.75.6 Hint Health Membership APIThe Membership API from Hint Health — 6 operation(s) for membership.74.4 Confluence Group API**[WARNING](https://support.atlassian.com/user-management/docs/create-and-update-groups/) The standard Atla...74.2 Close Memberships APIThe memberships API from Close — 3 operation(s) for memberships.73.2 Mapp Marketing Cloud Membership APIThe Membership API from Mapp Marketing Cloud — 16 operation(s) for membership.68.7 Hilt Memberships APIThe memberships API from Hilt — 11 operation(s) for memberships.68.2 Griffin Memberships APIMemberships represents the relationship between a [user](#tag/Users) and an [organization](#tag/Organizatio...67.6 Eclipse Working Groups APIREST API for Eclipse working groups and special interest groups — participation levels, resources, particip...66.8

Strong 12 Solid coverage with minor gaps

PixieBrix Memberships APIThe memberships API from PixieBrix — 1 operation(s) for memberships.65.0 Automattic Memberships APIThe memberships API from Automattic — 10 operation(s) for memberships.61.7 Cobot Membership APIRepresents a person being a member in a space. Can optionally be connected to a User.61.5 Bonitasoft Membership APIManage membership of users. There is a membership when a user belongs to a group and a role. Use this resou...61.2 NationBuilder Memberships APIA membership is a way to organize supporters and provide additional benefits based on actions they've taken...60.1 Commerce Layer Memberships APIresource type59.7 Amazon Web Services Membership APIThe Membership API from Amazon Web Services — 2 operation(s) for membership.58.6 Amazon Web Services Memberships APIThe Memberships API from Amazon Web Services — 14 operation(s) for memberships.58.6 Webex Memberships APIThe Memberships API from Webex — 2 operation(s) for memberships.58.4 ServiceTitan Memberships APIManage membership types, customer memberships, membership invoice templates, recurring service types, and r...57.7 ADP Memberships APIList all memberships54.7 LiveLike Memberships APIThe Memberships API from LiveLike — 1 operation(s) for memberships.54.4

Developing 18 Usable, with meaningful gaps to close

Later Membership APIThe Membership API from Later — 7 operation(s) for membership.54.0 Fintecture Memberships APIThe Memberships API from Fintecture — 2 operation(s) for memberships.52.0 Mode Memberships APIThe Memberships API from Mode — 2 operation(s) for memberships.50.7 Hang Memberships APIThe Memberships API from Hang — 10 operation(s) for memberships.50.1 CloudTruth Memberships APIThe memberships API from CloudTruth — 2 operation(s) for memberships.49.7 Blackbaud Memberships APIThe Memberships API from Blackbaud — 34 operation(s) for memberships.49.6 Warwick SU Membership APIThe Warwick Students' Union publishes a Membership API for validating membership and retrieving member rost...48.2 MemberPress Memberships APIMemberships are the products members buy.47.5 Blackbird Memberships APIPer-(member, restaurant) loyalty records carrying check-in counts and tiers.46.0 SumUp Memberships APIEndpoints to manage user's memberships. Memberships are used to connect the user to merchant accounts and t...44.1 DataCite membership — Fondren Library, Rice UniversityRice University is a DataCite direct member, registered 2017-11-13 as provider `rice` (symbol RICE) under F...43.0 ROR registration — Rice UniversityRice University's entry in the Research Organization Registry, ROR ID https://ror.org/008zs3103. It is the ...43.0 OpenProject Memberships APIUsers and groups can become members of a project. Such a membership will also have one or more roles assign...42.7 Radiant Earth Memberships APIThe Memberships API from Radiant Earth — 6 operation(s) for memberships.42.2 Fulcrum Memberships APIAccount memberships and assignments42.0 BJ's Wholesale Club Membership APIThe Membership API from BJ's Wholesale Club — 1 operation(s) for membership.40.2 Packet Host Memberships APIMembership Management (Project). Check out the product docs to learn more about [Membership](https://metal....40.2 EZR Open PlatformThe EZR 开放平台 integration surface — 236 documented interfaces across 11 business domains (base data, member ...39.9

Thin 23 Limited public surface area

DataCite Membership — Washington University in St. Louis LibrariesWashington University in St. Louis Libraries is a DataCite direct member, symbol WUSTL, registered 2018-08-...38.9 University of Washington Membership APIGroup membership information38.1 DataCite repository membership (QWBT.ULISBOA)An active DataCite repository client registered to the university's central services for minting DOIs over ...37.0 Luma Memberships APIThe Memberships API from Luma — 3 operation(s) for memberships.36.6 Equinix Memberships APIMembership Management (Project). Check out the product docs to learn more about [Membership](https://metal....35.8 Crossref membership (7569, 16151)Two Crossref member records belong to the institution. Member 7569, "University of Ottawa Library", holds p...34.5 DataCite membership (UOTT)The University of Ottawa is a DataCite member and DOI registrant. Probed 2026-09-01: GET https://api.dataci...34.5 Patreon API v2The Patreon REST API v2 follows the JSON:API specification. It exposes campaigns, members (patrons), posts,...34.5 ROR registration (03c4mmv16)The University of Ottawa is registered in the Research Organization Registry as https://ror.org/03c4mmv16, ...34.5 Crossref membershipGhent University is a Crossref member in its own name - member id 9286, DOI prefix 10.21825, registered in ...34.1 PayFast Subscriptions APIManage recurring billing subscription agreements34.0 DataCite membership and DOI registration (member AWZY)The university is a DataCite member and DOI registrant — a fact about the institution, recorded here as a m...31.7 ROR registration (Research Organization Registry)The institution's entry in the Research Organization Registry, ROR ID https://ror.org/03a1kwz48. A registry...31.7 Fourthwall Memberships APIThe Memberships API from Fourthwall — 3 operation(s) for memberships.29.9 Neon One Memberships APIMembership levels and terms held by an account.29.7 Cisco Collaboration Hybrid Solutions Memberships APIThe Memberships API from Cisco Collaboration Hybrid Solutions — 2 operation(s) for memberships.29.3 IDEM GARR Identity Federation membershipPolitecnico di Milano's membership of IDEM, the Italian academic identity federation run by GARR. The feder...27.8 ROR registrationThe institution's entry in the Research Organization Registry, ROR ID 01nffqt88, carrying its canonical nam...27.8 GakuNin academic access management federation membershipNagoya University is a participating institution in GakuNin (学術認証フェデレーション), the Japanese national academic ...27.3 TableCheck Memberships APIThe memberships API from TableCheck — 2 operation(s) for memberships.26.7 Crossref membership — Universiti Sains MalaysiaUSM is Crossref member 8963, registering DOIs under prefixes 10.21315 (USM Press journals such as the Malay...26.5 ROR record — Universiti Sains MalaysiaUSM's Research Organization Registry identifier, https://ror.org/02rgb2k63. The identifier is the join key ...26.5 CVAT Memberships APIMembership of users within organizations.26.3

Emerging 23 Early or largely undocumented

GrowthZone Memberships APIMembership types and member rosters.25.2 Crossref Memberships — Keio unitsTwo Keio units are Crossref members in their own right: member 1082, "Keio Journal of Medicine", DOI prefix...24.9 DataCite Membership — provider `keio`Keio University is a registered DataCite provider — id `keio`, symbol KEIO, memberType consortium_organizat...24.9 ROR Registration — Keio UniversityKeio University is registered in the Research Organization Registry as https://ror.org/02kn6nx58, with doma...24.9 Race Entry Memberships APIThe Memberships API from Race Entry — 2 operation(s) for memberships.24.5 Userflow REST APIThe Userflow REST API allows back-end applications to synchronize user data, track events, and manage group...24.1 Whop Memberships APIA user's access to a product; lifecycle and access management.21.2 Ko-fi WebhookOutbound webhook that Ko-fi HTTP POSTs to a URL you configure whenever a payment happens on your Ko-fi page...20.7 Medrio Users and Memberships APIAdminister the account user profile and per-study memberships - read and update your user, change password,...20.5 Crossref membership (AUB)AUB is a Crossref member in its own right — member id 13566, primary name "American University of Beirut", ...19.9 CARSI membership (CERNET Authentication and Resource Sharing Infrastructure)Wuhan University is a registered identity provider in CARSI, China's national research-and-education identi...18.6 HMB APICreate and access membership information for the HMB membership.18.6 Crossref Membership — Servicio de Publicaciones de la UAMUAM's publications service is a Crossref member (member id 6788) and mints DOIs under prefix 10.15366, with...18.0 ROR Registration — Universidad Autónoma de MadridUAM's Research Organization Registry identifier, https://ror.org/01cby8j38, the canonical machine-readable ...18.0 Crossref membershipThe University of Chile is a Crossref member, id 3330, primary name "Universidad de Chile", DOI prefix 10.5...16.4 DataCite membership and repository registrationThe University of Chile is a DataCite member, not a DataCite operator. Evidenced 2026-09-01 from the DataCi...16.4 ROR organization recordThe University of Chile's Research Organization Registry record: https://ror.org/047gc3g35, established 184...16.4 FreshPass Delivery SubscriptionFreshPass is the Albertsons-family paid subscription that provides unlimited free grocery delivery, exclusi...15.5 Zen Planner Memberships APIThe Memberships API from Zen Planner — 1 operation(s) for memberships.15.4 Glofox Memberships, Plans & Credits APIManage Plans (the terms, duration, and pricing of a service offering), a member's Membership against a give...15.2 Wodify Memberships APIMembership records, templates, holds, and billing configuration.14.6 Strikingly Site Management APIInternal REST API for managing Strikingly website content, sections, blog posts, store products, form submi...14.1 Boulevard Admin API - Memberships & PackagesAccess recurring membership and prepaid package data - plan status, renewal state, and entitlements. Member...13.6

Minimal 3 Almost no public developer surface

E by EquinoxUltra-luxury, invitation-only tier of Equinox membership offering hyper-personalized coaching, recovery, nu...10.5 Personify MemberClicks (MC Professional) APIJSON REST API for the MemberClicks MC Professional AMS, secured with OAuth 2.0. Base URL is organization-sc...9.1 Personify Wild Apricot APIRESTful API for the Wild Apricot small-association product, secured with OAuth 2.0 against base https://api...9.1

Companies reaching this through an API (61)

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

Acme Markets ADP AfterShip Amazon Clean Rooms Amazon Web Services American University of Beirut Automattic Autonomous University of Madrid Blackbaud Bonitasoft Boulevard Cisco Collaboration Hybrid Solutions Close Cloudflare CloudTruth Commerce Layer Confluence CVAT Eclipse Foundation Equinix Fintecture Fulcrum Ghent University Griffin GrowthZone Guardian Life Hilt Hint Health Keio University Later LiveLike Luma Mapp Marketing Cloud Mavrck Medrio Mode Nagoya University NationBuilder Neon One OpenProject Packet Host PayFast PixieBrix Politecnico di Milano Race Entry Radiant Earth Rice University SumUp TableCheck Universiti Sains Malaysia

Show all 61 companies ↓

University of Chile University of Lisbon University of Ottawa University of Tübingen University of Warwick University of Washington Userflow Washington University in St. Louis Webex Wodify Wuhan University

Score breakdown

Frequency

65.2

log-scaled weighted occurrences

Breadth

2.2

spread across providers

Quality lift

21.7

mean composite of providers using it

Cohesion

4.9

strength of nearest seed neighbor

Where this tag comes from

Provider tag94

Api tag90

Openapi tag42

Openapi op tag204

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Membership

Providers using this tag (93)

APIs with this tag (89)