canonical ↑ 11.2 capability

Authentication

Score 48.9 / 100 1745 providers 1716 APIs Search apis.io →

Variants seen in the corpus: AUTHAuthAuthenticationOAuthOAuth 2OAuth 2.0OAuth2Oauth

Providers using this tag (1743)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 53 Complete, well-documented, and agent-ready

KitEmail MarketingCreator EconomySubscribersAutomation14 APIs85.6 Centers for Medicare and Medicaid ServicesMedicareMedicaidHealthcareHealth Insurance26 APIs85.2 Elation HealthHealthcareUnited StatesEHREMR32 APIs84.1 drchronoEHRElectronic Health RecordsHealthcareMedical Records7 APIs83.5 SalesforceFortune 500Artificial IntelligenceAnalyticsCloud294 APIs83.3 ZoomInfoB2BB2B DataCompany DataContact Database29 APIs80.8 SvixWebhookWebhooks As A ServiceWebhook DeliveryWebhook Sending21 APIs79.2 Treasure DataCustomer Data PlatformCDPBig DataData Warehouse23 APIs76.7 NylasCalendarCommunicationsContactsEmail14 APIs76.2 ThanxRestaurantLoyaltyGuest EngagementMarketing14 APIs76.2 MoEngageCustomer EngagementMarketing AutomationCustomer Data PlatformPush Notifications11 APIs75.8 AdaArtificial IntelligenceCustomer ServiceChatbotsAutomation14 APIs75.7 LinkedInBusinessCareersMarketingProfessional Networking65 APIs75.1 veevaLife SciencesPharmaceuticalsClinical TrialsRegulatory9 APIs75.0 OutbrainAdvertisingNative AdvertisingOpen WebCTV13 APIs74.6 QontoBusiness BankingNeobankFintechPayments13 APIs74.6 Zoho CRMCRMSalesMarketing AutomationLead Management106 APIs74.1 AWeberEmail MarketingMarketing AutomationEmailNewsletters12 APIs73.5 TwilioCommunicationsContact CenterEmail115 APIs73.4 beehiivNewsletterCreatorEmailSubscription26 APIs73.3 Hint HealthDirect Primary CareDPCHealthcareMembership Management49 APIs73.0 SallaArabicE-CommerceGCCHeadless Commerce18 APIs72.5 Commerce LayerHeadless CommerceComposable CommerceAPI-FirstE-Commerce148 APIs72.4 Peach PaymentsPaymentsFintechAfricaPayment Gateway6 APIs72.3 VesselCRMChatDialerEmbedded Integrations20 APIs72.1 DynatraceAI OperationsAnalyticsAPMApplication Performance Monitoring34 APIs71.8 SquareRestaurantBookingsCatalogCheckout45 APIs71.8 LightfieldCompanyApplicationCRMSales13 APIs71.6 LINEMessagingChatbotsSocial LoginMini Apps10 APIs71.2 Jefferson HealthAcademic Medical CenterCARIN Blue ButtonCMS InteroperabilityCures Act19 APIs71.1 KrakenCryptocurrencyExchangeTradingMarket Data24 APIs70.6 RemoteGlobal PayrollEORContractor ManagementContractor of Record40 APIs69.9 falArtificial IntelligenceGenerative AIGenerative MediaImage-Generation12 APIs69.7 Cvent Event CloudAttendee HubAttendeesBulkContacts42 APIs69.6 TealiumCustomer Data PlatformCDPTag ManagementAudienceStream12 APIs69.2 UpholdCompanyCryptocurrencyDigital AssetsPayments25 APIs69.1 CanvaApplicationAutomationBrand ManagementCollaboration15 APIs69.0 BlueConicCustomer Data PlatformCDPCustomer ProfilesSegments28 APIs68.8 PirschAnalyticsWeb AnalyticsPrivacyGDPR15 APIs68.7 Solo.ioCompanyAPI GatewayService MeshKubernetes15 APIs68.4 PlaidFinancialFintechOpen BankingBank Accounts31 APIs68.2 VimHealthcareUnited StatesClinical AIEHR Integration6 APIs68.2 Dun & BradstreetBusiness DataCompany DataD-U-N-S NumberCredit16 APIs67.9 iOSiOSAppleMobileApp Store199 APIs67.9 BenchlingLife SciencesBiotechR&DMolecular Biology58 APIs67.8 Snov.ioSales AutomationEmail FinderEmail VerificationLead Generation17 APIs67.8 FitbitWearableHealthFitnessActivity Tracking3 APIs67.6 MatomoAnalyticsWeb AnalyticsOpen-SourcePrivacy61 APIs67.3 8x8TelecommunicationsUnited StatesCPaaSUCaaS36 APIs67.1 Memo BankCompanyFintech InsurtechBankingBusiness Banking3 APIs67.0 TibberEnergySmart HomeSmart MeterElectricityPricing4 APIs67.0 AirbyteData IntegrationETLELTOpen-Source44 APIs66.6 Tvarka ATK APIDigital SignatureeIDASQES9 APIs66.6

Strong 225 Solid coverage with minor gaps

Developing 606 Usable, with meaningful gaps to close

Thin 585 Limited public surface area

Emerging 233 Early or largely undocumented

Minimal 41 Almost no public developer surface

Web3AuthWeb3WalletsMPC2 APIs10.8 LollipuffCompanyLuxury GoodsDesigner Fashion10.6 CargoWiseLogisticsFreight ForwardingSupply ChainCustoms5 APIs10.5 Maya3DAnimationAutodeskCGI9 APIs10.5 Goat GroupCompanyMarketplaceE-CommerceSneakers10.4 BurbankCompanyPaymentsFintech9.8 TradeblockCompanySneakersMarketplaceTrading9.6 RemindMessagingCommunicationsEducationK-129.0 BukalapakCompanyE-CommerceMarketplaceRetail1 API8.9 CenturyLink (Lumen Technologies)BroadbandConnectivityEdgeFiber5 APIs8.9 Consolidated EdisonEnergyFortune 500Green ButtonNatural Gas2 APIs8.9 HonorlockProctoringOnline ProctoringAcademic IntegrityAssessment6 APIs8.9 KinveyCompanyBackend-as-a-ServiceMobileSDK8.9 VodafoneTelecommunicationsTelcoMobile Network Operator5G27 APIs8.7 OpenID ConnectIdentityJWTOpenID Connect8.6 BT GroupTelecommunicationsTelcoMobile NetworkBroadband15 APIs8.5 IDEXXVeterinaryDiagnosticsReference LabsDiagnostic Imaging5 APIs8.3 InAuth (American Express)CompanyAI InfrastructureFraud PreventionDevice Intelligence8.3 OpenLDAPDirectory ServicesLDAPIdentity1 API8.2 Dewu (POIZON)CompanyTechnologyE-CommerceMarketplace8.1 Rakuten MobileTelecommunicationsMobile Network OperatorCarrier5G3 APIs7.9 PersonifyAssociation ManagementAMSMembershipNon-Profit3 APIs7.4 island.is (Digital Iceland)Digital GovernmentGraphQLOpenAPIX-Road2 APIs7.2 ShippingboShippingLogisticsE-CommerceOrder Management2 APIs6.6 OCRAOCRAOTPSecurity5.5 RappiDeliveryFood DeliveryGrocery DeliveryOn-Demand1 API5.5 General Galactic CorporationCompanyWeb3EthereumBlockchain5.3 BehavioSecCompanyEnterpriseBehavioral BiometricsFraud Detection5.0 Blink IdentityCompanyIdentityBiometricsFacial Recognition5.0 Customer PortalsAccount ManagementBillingCustomer Self-Service5.0 Cyota, IncCompanyCybersecurityFraud Detection5.0 IAMAccess ManagementAuthorizationIAM5.0 idsmanagerCompanyIdentityAuthorization5.0 Nok Nok LabsCompanyEnterpriseFIDO5.0 OpenNetwork Tech.CompanyIdentitySingle Sign-OnWeb Access Management5.0 ScorceCompanyKYCIdentity VerificationFraud Prevention5.0 Security ProtocolsEncryptionNetworkingSecurity4.3 Arcot SystemsCompanyPayment SecurityFraud Prevention1.5 SODACompanyConsumerMarketplaceE-Commerce1.5 CraneAerospaceCurrencyDiversified Manufacturer0.9 ProxyCompanyDigital IdentityWearables0.1

APIs with this tag (1692)

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 55 Complete, well-documented, and agent-ready

CMS Beneficiary Claims Data API (BCDA)Enables Medicare Accountable Care Organizations (ACOs) and alternative payment model participants to retrie...85.2 Elation Health Authentication APIOAuth2 token management84.1 Elation OAuth APIOAuth2 token endpoint for the Elation API v2.0. Partners exchange client credentials (and legacy password g...84.1 Salesforce Authentication APIOAuth 2.0 token operations for obtaining access tokens using client credentials or authorization code flows.83.3 Salesforce Oauth APIThe Oauth API from Salesforce — 5 operation(s) for oauth.83.3 Salesforce REST APIThe Salesforce REST API provides a simple and powerful web service interface to interact with Salesforce or...83.3 ZoomInfo Authentication APIThe ZoomInfo API authenticates client access requests using a JSON Web Token (JWT). A JWT is a string that ...80.8 Svix Authentication APIEasily give your users access to our pre-built management UI.79.2 Treasure Data User APIREST API for managing users, access control, and authentication within a Treasure Data account.76.7 Nylas Auth APIAuthentication. Hosted OAuth 2.1 authorization and token exchange, custom (non-OAuth) grant creation for Ag...76.2 Thanx Auth APIAcquire privileged end-user access tokens.76.2 MoEngage MCP ServerHosted, OAuth-secured Model Context Protocol server that lets AI assistants build campaign drafts, author c...75.8 Ada Integrations APIConnect external applications to Ada using OAuth to extend AI agent capabilities with partner-built integra...75.7 LinkedIn Authentication APIOAuth 2.0 token management for customer applications75.1 LinkedIn Consumer APIThe LinkedIn Consumer Solutions Platform enables sites and applications the power to enhance their sign-in ...75.1 veeva Authentication APISession management75.0 Outbrain Authentication APIToken-based authentication74.6 Qonto OAuth APIThe OAuth API from Qonto — 1 operation(s) for oauth.74.6 AWeber Authentication APIThe Authentication API from AWeber — 4 operations covering the OAuth 2.0 token and revoke endpoints on auth...73.5 beehiiv OAuth2 APIThe beehiiv OAuth2 authorization surface — authorization-code flow with PKCE, plus token creation, refresh,...73.3 Hint Health OAuth APIThe OAuth API from Hint Health — 1 operation(s) for oauth.73.0 Salla OAuth APIThe OAuth API from Salla — 3 operation(s) for oauth.72.5 Peach Payments Authentication APIOAuth 2.0 token generation for Checkout, Payouts, and Reconciliation.72.3 Vessel Platform APIThe Vessel Platform API is the control plane of the Vessel embedded integrations platform. It covers the Li...72.1 Dynatrace Access Tokens API v2The Dynatrace Access Tokens API v2 allows you to create, list, update, and delete API access tokens and Act...71.8 Square OAuth APIThe OAuth API from Square — 3 operation(s) for oauth.71.8 Lightfield Auth APIThe Auth API from Lightfield — 1 operation(s) for auth.71.6 LINE Channel Access Token APIIssues, verifies and revokes the channel access tokens every other LINE server API consumes. Four generatio...71.2 LINE Login v2.1End-user authentication and authorization over OAuth 2.0 authorization code grant and OpenID Connect. Autho...71.2 Kraken Auth APIAPI key checks70.6 Kraken OAuth REST APIOAuth 2.0 authorization surface allowing third-party applications to request scoped delegated access to a K...70.6 Remote OAuth APIOAuth 2.0 authorization endpoints69.9 fal API Keys APIManage fal API keys — create, list, scope, and revoke keys used to authenticate against the Model, Storage,...69.7 Cvent Event Cloud Authentication APIEndpoints for obtaining, refreshing, and validating OAuth2 access tokens.69.6 Cvent Platform REST API (Event Cloud)RESTful API for managing events, contacts, registrations, attendees, sessions, speakers, exhibitors, survey...69.6 Tealium Auth APIThe Auth API from Tealium — 1 operation(s) for auth.69.2 Uphold Authentication APIAuthentication.69.1 Canva Connect APIThe umbrella Canva Connect REST API as Canva publishes it — 59 operations across designs, assets, folders, ...69.0 BlueConic OAuth 2.0 APIThe OAuth 2.0 API allows external applications to be authenticated and authorized to access the public Blue...68.8 Pirsch Authentication APIObtain access tokens using OAuth2 client credentials68.7 Solo.io Auth APIAuthentication redirect endpoints68.4 Plaid Auth APIPlaid's Auth is part of the Plaid open-finance platform, exposing 3 documented endpoint(s) under the Plaid ...68.2 Plaid Link APIPlaid's Link is part of the Plaid open-finance platform, exposing 4 documented endpoint(s) under the Plaid ...68.2 Dun & Bradstreet Authentication APIOAuth 2.0 token issuance for Direct+.67.9 Sign in with Apple REST APISign in with Apple is Apple's OpenID Connect-style identity provider for iOS, web, and other Apple-platform...67.9 Benchling Authentication APIEndpoints to help authenticate with the rest of the API resources.67.8 Snov.io Authentication APIOAuth 2.0 token management67.8 Fitbit Oauth2 APIThe Oauth2 API from Fitbit — 4 operation(s) for oauth2.67.6 Matomo Login APIThe Matomo Login API exposes 1 operations of the Matomo Reporting API (module `Login`). Authentication-rela...67.3 Matomo OAuth2 APIThe Matomo OAuth2 API exposes 8 operations of the Matomo Reporting API (module `OAuth2`). OAuth 2.0 client ...67.3 8x8 Analytics for Contact Center Historical Metrics API8x8 Analytics for Contact Center Historical Metrics API for querying historical queue, agent and interactio...67.1 8x8 Analytics for Contact Center Real-time Metrics API8x8 Analytics for Contact Center Real-time Metrics API for live queue, agent and interaction state, secured...67.1 Memo Bank Marketplace APIOAuth 2.0 authorization layer that lets third-party developers build Memo Bank Marketplace integrations and...67.0 Airbyte OAuth APIThe OAuth API from Airbyte — 1 operation(s) for oauth.66.6 Tvarka ATK API Auth APIThe eID authentication ceremony (`/v1/auth/*`).66.6

Strong 226 Solid coverage with minor gaps

Developing 608 Usable, with meaningful gaps to close

Thin 587 Limited public surface area

Emerging 201 Early or largely undocumented

Mudflap Partner APIOAuth 2.0 / OpenID Connect protected API surface serving Mudflap's partner, fleet, and merchant dashboards....26.1 SideQuest OAuth2 APIThe OAuth2 API from SideQuest — 3 operation(s) for oauth2.26.1 Signifyd Account Protection APIScore and protect non-purchase customer journeys — Account Opening, Login, and Modification events — agains...26.1 Kenjo Authentication APIExchange an API key for a bearer token and invalidate tokens.26.0 Earnipay Authentication APIUser authentication and authorization endpoints25.9 Instana Authentication APIThe Authentication API from Instana — 4 operation(s) for authentication.25.9 NowCerts Authentication APIObtain and refresh bearer tokens.25.8 OneScreen MCP ServerOneScreen's only API surface: a remote Model Context Protocol server over Streamable HTTP that exposes OOH ...25.8 Tank Utility Authentication APIExchange account credentials for a short-lived API token.25.7 Zoho Recruit REST API v2REST API for managing candidates, contacts, clients, job openings, interviews, attachments, notes, and cust...25.7 WinCL Auth APIAuth Controller25.6 Wove Authentication APIOAuth 2.0 authentication endpoints25.6 BizVerify Auth APIThe Auth API from BizVerify — 2 operation(s) for auth.25.4 CAMARA Identity and Consent Management APIShared authorization and consent model across CAMARA APIs, built on OAuth 2.0 / OpenID Connect Client-Initi...25.4 CAMARA Number Verification APISilent, cryptographically strong verification that the mobile number a user claims to own is actually the n...25.4 Ceph Auth APIThe Auth API from Ceph — 3 operation(s) for auth.25.4 Ford OAuth APIThe OAuth API from Ford — 1 operation(s) for oauth.25.4 Rohlik MCP ServerOfficial hosted Model Context Protocol server for Rohlik online grocery. Search the catalog, manage a cart,...25.4 OpenInfra Foundation Auth APIThe Auth API from OpenInfra Foundation — 3 operation(s) for auth.25.3 Casdoor Authentication APILogin, callback, and device authorization25.2 Casdoor CAS ServerCasdoor exposes a CAS (Central Authentication Service) server compatible with CAS protocol versions 1.0, 2....25.2 Casdoor OAuth 2.0 / OIDC ProviderCasdoor implements an OAuth 2.0 authorization server and OpenID Connect identity provider, exposing the sta...25.2 Klarna Kosma Auth APIThe Auth API is the client-session companion to the XS2A API. Whenever the Open Banking flow requires consu...25.2 Reverb Auth APIThe Auth API from Reverb — 4 operation(s) for auth.25.2 Everytable Customer Account (OAuth 2.0 / OpenID Connect)Shopify Customer Accounts authorization server for Everytable, discoverable anonymously at https://everytab...25.1 Directus REST APIAuto-generated REST API built on top of any SQL database schema. Provides full CRUD operations on all colle...25.0 OpenID ConnectIdentity layer on top of OAuth 2.0. Agent-readiness for authenticated APIs depends on clear, discoverable O...25.0 Gymkhana Profiles OAuth APIAn OAuth 2.0 (RFC 6749) identity and profile API operated by the IIT Bombay Students' Gymkhana. It exposes ...24.9 Hopper Authentication APIThis API is authenticated with OAuth 2, Client Credentials grant.\ Clients should use their `client_id` and...24.9 ITC Single Sign-On APIA session-based Single Sign-On service maintained by the Institute Technical Council (ITC) for authenticati...24.9 Okra Auth APIAuthentication data for linked bank accounts.24.9 Cisco Nexus Dashboard Authentication APISession authentication and token management via aaaLogin and aaaLogout24.8 Determined AI Authentication APILog in to and out of the cluster24.8 Pitney Bowes Oauth APIThe Oauth API from Pitney Bowes — 1 operation(s) for oauth.24.8 Pulse Software Authentication APIAuthentication for accessing Pulse Public API24.8 USPS OAuth 2.0Token endpoint for OAuth 2.0 Client Credentials authentication used to authorize requests to all USPS API p...24.8 Copper MCP ServerAn undocumented Model Context Protocol server operated by Copper at mcp.getcopper.com. The host publishes R...24.7 Silverfort REST APIThe Silverfort REST API (internally the "Raven" service) exposes user and resource risk read and write, ser...24.7 FundGuard Website MCP ServerA Model Context Protocol server served from FundGuard's own corporate web host via the WordPress MCP adapte...24.6 Getnet Chargeback APIDispute management API for listing, viewing, contesting, accepting, and documenting chargebacks. Three acto...24.5 Getnet OAuth 2.0 Token APIOAuth 2.0 client-credentials token endpoint used to mint bearer access tokens for Getnet APIs. Tokens are s...24.5 RecVue Authentication APIOAuth2 client-credentials token issuance.24.5 SMART on FHIRAn open-spec authorization profile layered on top of FHIR that enables third-party clinical applications to...24.5 Crystal Reports Authentication APILogon and session management24.4 Pi-hole Auth APISession authentication.24.4 AstroPrint Cloud APIOAuth 2.0 protected REST API for the AstroPrint cloud 3D printing platform. Manage printers, designs, and p...24.3 NHS Login APINHS login provides a single, secure way for citizens to access NHS digital services. The NHS login API enab...24.3 Anduril Industries OAuth APIToken issuance for client-credentials authentication.24.1 Brown Shibboleth Single Sign-On (SAML)Brown's InCommon-federated Shibboleth identity provider implementing the OASIS SAML 2.0 standard for web si...24.1 Aalto API GatewayAalto's 3scale-based API gateway exposing open interfaces about Aalto and its operations, sourced from syst...23.9 Avamar REST APIThe Avamar REST API provides a framework to develop applications and tools that interact with a stand-alone...23.8 Oracle NetSuite SuiteTalk REST Record APIREST Web Services API for creating, reading, updating, and deleting NetSuite records such as customers, ven...23.8 Acorns Partner APIThe Acorns Partner API combines OAuth and Partner APIs to allow authorized third parties (partners and aggr...23.7 EchoSync Authorizer APIOAuth 2.0 authorization endpoint that issues bearer tokens consumed by the EchoSync Customer API and Carrie...23.7 Liquid M Authentication APIAuth token issuance for the Reporting API.23.7 Epic Account Services APIEpic Account Services (EAS) provides authentication and identity for players using Epic Games accounts. Sup...23.6 NeuVector Authentication APIAuthenticates login or logout23.6 Caspio Authentication APIOAuth 2.0 token endpoint23.5 Caspio REST APIREST API for Caspio Bridge accounts providing programmatic access to tables, views, records, files, users, ...23.5 Phantom React SDKReact SDK (@phantom/react-sdk) for integrating Phantom across Solana and EVM chains with embedded wallet su...23.5 Raken Public APIRaken Public API 3.0 is a REST API protected by OAuth 2.0 that exposes the core entities of the Raken const...23.5 Vitality Partner API GatewayVitality's production API gateway, running WSO2 API Manager at apis.vitality.co.uk (origin wso2-prd-apigw.t...23.5 Flower Shop Network Authentication APIToken issuance and validation23.4 Keycloak Admin REST APIAdministration REST API for Keycloak identity and access management, supporting OAuth2, OpenID Connect, and...23.4 UPM Shibboleth SAML 2.0 Identity ProviderFederated single sign-on identity provider for Universiti Putra Malaysia, built on Shibboleth and publishin...23.4 Atomic Authentication APIAtomic's authentication layer powers user-permissioned access to third-party payroll, employer, and merchan...23.3 Sage Intacct REST APIModern REST API for Sage Intacct using OAuth 2.0 Bearer token authentication. Provides standard HTTP verbs ...23.3 jAccount Single Sign-On (OAuth 2.0 / OIDC)jAccount is SJTU's identity and single sign-on system. It provides OAuth 2.0 and OpenID Connect authorizati...23.2 Oauth2-Proxy Oauth2 APIThe Oauth2 API from Oauth2-Proxy — 7 operation(s) for oauth2.23.2 LIVEKINDLY MCP Server (WordPress MCP Adapter)A Model Context Protocol server advertised in the thelivekindlyco.com WordPress REST route index under the ...23.1 ASU WebAuth (CAS / Shibboleth SSO)ASU operates an enterprise single sign-on service using the Central Authentication Service (CAS) protocol w...23.0 Introhive Platform OAuthThe OAuth 2.0 authorization surface in front of the Introhive platform. Introhive publishes an RFC 8414 OAu...23.0 Shopify Customer Account API (OAuth2 / OIDC)honest.com authenticates shoppers through the Shopify Customer Account API, an OAuth2 / OpenID Connect prov...23.0 TAL Partner IdentityTAL's partner-facing OpenID Connect identity tenant (Okta org talpartner-au.okta.com), and the only machine...22.9 iHealth Open API V2OAuth 2.0-authorized REST API that lets registered third-party applications read a consenting iHealth user'...22.4 SEED Identity (OpenID Connect)The OpenID Connect and OAuth 2.0 provider behind SEED player accounts. Klang publishes no documentation for...22.3 Sliplane Control APIThe Sliplane Control API is a REST API at https://ctrl.sliplane.io/v0 for programmatically managing organiz...22.3 Veeva Systems Authentication APIThe Authentication API from Veeva Systems — 4 operation(s) for authentication.22.3 AUB Shibboleth Identity Provider (SAML 2.0)AUB's institutional single sign-on is provided by a Shibboleth SAML 2.0 identity provider. The SAML metadat...22.2 LISNR Authentication APIThe Authentication API from LISNR — 5 operation(s) for authentication.22.2 SAP SuccessFactors Oauth APIThe Oauth API from SAP SuccessFactors — 1 operation(s) for oauth.22.2 TU Berlin GitLab APISelf-hosted GitLab Enterprise Edition instance for TU Berlin. The GitLab REST API (v4) is present but gated...22.2 University of Exeter Shibboleth Identity Provider (SAML SSO)The University of Exeter operates a SAML-based federated identity service via a Shibboleth Identity Provide...22.2 USTC Unified Identity Authentication (Passport SSO)passport.ustc.edu.cn is the university's unified single sign-on / identity authentication service used by m...22.2 Tune Therapeutics Website MCP ServerTwo Model Context Protocol servers exposed from the Tune Therapeutics corporate WordPress site via the Word...22.1 Hanyang University Open API SDKsSoftware development kits published by the Hanyang University Developer Center for building applications ag...22.0 Kroger Identity and Loyalty APIThe Kroger Identity API provides OAuth 2.0-based authentication for Kroger customers including Roundy's ban...22.0 Qualys Authentication APIAuthentication endpoint that issues JSON Web Tokens (JWT) used as Bearer credentials for newer Qualys APIs ...21.9 Toutiao Open API (OAuth + User Profile)Toutiao account OAuth 2.0 and user-profile API, served from the open.snssdk.com host and documented on the ...21.9 Sageox Auth APISession management and token lifecycle. Validates JWT tokens issued by Better Auth, returns session details...21.8 2ndKitchen Authentication APIThe Authentication API from 2ndKitchen — 5 operation(s) for authentication.21.7 myBots Identity (OAuth 2.0 / OpenID Connect)The myBots identity provider, running OpenIddict. This is the only surface in the estate that publishes a c...21.7 Nanjing University Unified Identity Authentication (CAS SSO)Nanjing University operates a unified identity authentication platform providing single sign-on across univ...21.7 Sketch Cloud APIREST API for managing Sketch workspaces, members, and documents in the Sketch cloud collaboration platform....21.5 Wyndham Business WordPress MCP Server (OAuth-gated)A WordPress MCP adapter is registered on www.wyndhambusiness.com in the `mcp` namespace alongside wp-abilit...21.5 Bishop Fox Cosmos API (v5)Authenticated REST API for the Bishop Fox Cosmos attack-surface management platform. Exposes the customer's...21.4 IIT Delhi OAuth 2 Authentication ServerIIT Delhi operates an OAuth 2 authorization server that lets developers register their own campus apps and ...21.3 Rice Shibboleth SAML Identity ProviderRice University Shibboleth/SAML 2.0 identity provider used for federated single sign-on. The IdP publishes ...21.3 Waseda Identity Provider (Shibboleth SAML SSO)Waseda's institutional single sign-on is provided through a Shibboleth SAML Identity Provider, used to auth...21.3 Tuakiri Federated Identity (SAML 2.0 / Shibboleth)The University of Otago operates a SAML 2.0 / Shibboleth Identity Provider (IdP) as a member of the Tuakiri...21.2 UB Centralized SSO (SAML 2.0 / CAS)Universitat de Barcelona centralized single sign-on (Identificació UB) providing federated authentication f...21.1 ITB Single Sign-On (CAS)ITB's campus-wide single sign-on, built on the Apereo CAS (Central Authentication Service) protocol. Applic...21.0 Lens AuthenticationLens authentication uses a sign-in-with-Ethereum style challenge: a client requests a signing message from ...21.0 Libryo APIThe Libryo Platform's partner-facing RESTful API. Third-party applications integrate on behalf of a Libryo ...20.9 GakuNin Shibboleth Identity Provider (SAML)SAML 2.0 / Shibboleth identity provider for institutional single sign-on, participating in Japan's GakuNin ...20.8 KAU Single Sign-On / Identity FederationKing Abdulaziz University operates an institutional single sign-on portal (sso.kau.edu.sa) and an Oracle Ac...20.8 OB-1 PlatformThe OB-1 coding-agent platform. The only publicly reachable API surface is the OAuth 2.0 / OpenID Connect a...20.8 Reggora Users & Authentication APIAuthenticate integrations with a JWT bearer token plus a per-integration API key, and manage the lender use...20.8 Resilience Identity (Auth0 Authorization Server)The only publicly documented, machine-readable surface Resilience operates. portal.cyberresilience.com — th...20.7 Politecnico di Milano Shibboleth Identity ProviderShibboleth/SAML2 identity provider for Politecnico di Milano, serving federated single sign-on as part of t...20.6 Discover ProtectBuy 3-D Secure APIProtectBuy is Discover Global Network's EMV 3-D Secure (3DS) cardholder authentication service. Built on th...20.4 Gymshark Identity (OpenID Connect)The OpenID Connect / OAuth 2.0 authorization server Gymshark operates on its own domain at auth.gymshark.co...20.3 Fusio Consumer APIThe Fusio Consumer API is used by the developer portal application and enables third-party developers to re...20.2 Verizon Connect Token Authorization APIExchanges Base64-encoded Reveal REST credentials for a short-lived bearer authorization token (valid ~20 mi...20.2 Soda Authentication APIThe Authentication API from Soda — 1 operation(s) for authentication.20.1 Western Single Sign-On (SAML2 / OAuth / OIDC / CAS)Western Technology Services operates an institutional Single Sign-On service supporting SAML2, OAuth, OpenI...20.1 Bloomberg Identity and Access ManagementAuthentication and authorization services for the Bloomberg Platform providing entitlement management, user...20.0 Cisco REST API Design GuideGuidelines for Designing REST APIs at Cisco, developed across Cisco DevNet, Collaboration, and the Applicat...20.0 Kinaxis MCP ServerA production-ready Model Context Protocol (MCP) server that provides AI agents and LLM-powered applications...20.0 Orange Logic Authentication APIAuthenticate against an Orange Logic instance and obtain tokens for subsequent calls. Supports OAuth 2.0 (c...19.8 SingVerify Number Verify APINetwork-based verification that the mobile number a user declares is the number of the SIM the request is a...19.8 American Express AMEX Account ConnectAMEX Account Connect is a suite of APIs that enables eligible American Express Card Members to add their Ca...19.7 FastMCP AuthenticationFastMCP ships a complete authentication and authorization layer for MCP servers. Servers can verify tokens,...19.7 KakaoPay Login APIREST API providing KakaoPay authentication services including token issuance, token refresh, user informati...19.7 Lazada Seller Authorization (OAuth) APISeller authorization flow: a Lazada seller grants a registered Lazada Open Platform app permission to call ...19.7 Safari Authentication Services APIAPI for authenticating users through web services in Safari using ASWebAuthenticationSession, supporting OA...19.6 Annex Cloud Tenant and Authentication APIManage internal users and issue the JWT tokens used to authenticate calls to the rest of the Loyalty Experi...19.5 Blue Origin Customer Portal (Payloads) Platform APIpayloads.blueorigin.com is Blue Origin's customer portal for payload customers, running on Salesforce Exper...19.5 Blue Origin Data Portal (BODP) Platform APIbodp.blueorigin.com is the Blue Origin Data Portal, a second Salesforce Experience Cloud community on the s...19.5 RXNT Authentication APIObtain a time-limited token and signature.19.5 Spectrum Carrier Serviceability APIThe Spectrum Carrier Serviceability API enables carrier partners to submit address serviceability requests ...19.4 Spectrum Enterprise Client APIThe Spectrum Enterprise Open API provides B2B REST API access for enterprise clients to integrate directly ...19.4 RedotPay Agentic Payments APIProduction RedotPay HTTP API surface behind the redotpay CLI and the redotpay-payment MCP server. Provides ...19.2 garten TV MCP ServerA Model Context Protocol server published on garten's own host at https://tv.garten.co/mcp, serving the gar...19.1 Ivanti Connect Secure REST APIREST API for managing Ivanti Connect Secure (formerly Pulse Connect Secure) VPN appliances. Provides endpoi...18.9 KIT Shibboleth Identity Provider (SCC)KIT operates a Shibboleth/SAML 2.0 Identity Provider via the Scientific Computing Center (SCC) for single s...18.9 RADAR / RADAR4KIT Archive APIRADAR4KIT is KIT's interdisciplinary research-data repository for archiving and publishing research data, b...18.9 Tongji University Open PlatformOfficial institutional data and capability API platform for Tongji University. Provides documented APIs spa...18.9 Web Single Sign-On (Shibboleth)Institution-wide web authentication and authorization service operated by the Office of Technology and Digi...18.9 Zulily Customer Account API (Shopify)OpenID Connect / OAuth 2.0 authentication and customer-account access for Zulily shoppers, provided by the ...18.9 LivePerson Login Service APIAuthentication API for obtaining bearer tokens for application and user access to the LivePerson Conversati...18.8 Tegus Identity (OpenID Connect)The OpenID Connect / OAuth 2.0 authorization server that fronts sign-in for the Tegus platform. It is an Au...18.7 Programming Quotes Authentication APIProgramming Quotes — JWT login / register exchange.18.5 SpruceID OID4VCI Credential Issuance APISpruceID's OID4VCI (OpenID for Verifiable Credential Issuance) Rust library implements the OpenID4VC creden...18.4 SpruceID Sign-In with Ethereum (SIWE) APISign-In with Ethereum (SIWE) enables Ethereum accounts to authenticate with off-chain services by signing a...18.4 Vecna Robotics Partner Portal Identity (OpenID Connect)OpenID Connect / OAuth 2.0 identity endpoints served from the Vecna Robotics partner portal host (vecnarobo...18.4 QuickBooks Online Accounting APIREST API for managing QuickBooks Online accounting entities including Customer, Vendor, Employee, Item, Inv...18.1 Gigya REST API (SAP Customer Data Cloud)Gigya / SAP Customer Data Cloud REST API for accounts, identity, social login, consent, and profile data. E...18.0 API@USM Developer Portal (Gated)USM's institutional API developer portal operated by PPKT (Pusat Pengetahuan, Komunikasi dan Teknologi). Th...17.9 Nickelytics R-Ads Platform Authentication APIThe authentication, session, organization and admin API behind the Nickelytics / R-Ads Ad Manager. It is a ...17.8 SSO UI (CAS Authentication)Sistem Akun UI, the university-wide Single Sign-On service, implemented using the CAS (Central Authenticati...17.7 IRALOGIX Partner Authorization ServerThe publicly reachable OpenID Connect / OAuth 2.0 authorization server that fronts the IRALOGIX partner pla...17.6 UGM Single Sign-On (CAS)Central Authentication Service (CAS) single sign-on used across UGM systems for students, staff, and lectur...17.6 Wyze Developer APIOfficial Wyze token-issuance API for third-party integrations. Users create an API key in the Wyze Develope...17.6 Dex gRPC APIgRPC management API for Dex covering OAuth2 client lifecycle (Create, Get, Update, Delete, List), password ...17.4 Johrh Auth APIThe Auth API from Johrh — 4 operation(s) for auth.17.4 Chula SSO Authentication APISingle sign-on authentication service for Chulalongkorn University, allowing applications to securely authe...17.3 University of Waikato Identity Provider (uowidp)Campus single sign-on / identity provider service hosted at api.svc.waikato.ac.nz under the uowidp path. Th...17.3 Ermeo APIREST API for the Ermeo connected-operator platform. Authenticated with OAuth 2.0 (Bearer access tokens), it...17.2 McMaster API Service Developer PortalInstitutional API management developer portal operated by McMaster University Technology Services. Access r...17.2 Mural Public APIThe Mural Public API supports OAuth 2.0 with scopes, image and file uploads to murals, and CRUD on workspac...17.1 Hapihapi is a rich, configuration-centric framework for building web applications and APIs in Node.js. It provi...17.0 Mesa Authentication APIExchange API keys for a session token.17.0 Kingo Portal (SSO / Identity)Kingo Portal is SKKU's single sign-on environment that integrates and secures access to university online s...16.7 JD Open Platform (JOS) OAuth AuthorizationJOS authorization is JD's OAuth 2.0 flow for shop owners and JD enterprise accounts to grant a partner ISV ...16.6 Valid Chat With Your Ads MCP ServerA live first-party Model Context Protocol server that lets a Valid managed-service client query their whole...16.6 EatStreet API v2The live EatStreet API, served under https://eatstreet.com/api/v2 and protected by OAuth 2.0 authorization ...16.5 TriNet Identity APIThe TriNet Identity API provides access to employee identity and sensitive personally identifiable informat...16.4 Mitchell 1 Intent Resolve APIResolve endpoint (POST api/intent/v1/resolve) used to securely look up where a specific Web-Intent should b...16.1 Romit OAuth APIThe OAuth API from Romit — 2 operation(s) for oauth.16.1 Descartes Labs Auth APIThe Auth module handled token-based authentication against app.descarteslabs.com — OAuth login flow, refres...15.9 Moxtra REST APIMoxtra's REST API for building embedded collaboration experiences, covering users, binders (workspaces), pa...15.9 Shopee Shop Authorization APIThe shop authorization flow lets a Shopee seller grant a registered partner application access to their sho...15.9 Naver Login (OAuth 2.0) APINaver Login is an OAuth 2.0 identity provider used by Korean web and mobile apps to authenticate users with...15.8 Magic Admin APIREST API for backend integrations: validate Magic-issued DID tokens, fetch user metadata, log out users, an...15.5 SAIB & Co. Cafe24 Storefront APIOAuth 2.0 / OpenID Connect storefront surface for the SAIB & Co. mall on the Cafe24 Unified Commerce Platfo...15.5 Soundboks Customer Account API (Shopify)OAuth 2.0 / OpenID Connect customer-account surface exposed on the soundboks.com store domain by the Shopif...15.5 Satellogic Aleph Authentication APIOAuth 2.0 Client Credentials flow used by all Aleph APIs. Customers generate API credentials inside the Ale...15.4 Angi Pro Account Linking (Sign in with Angi)An OAuth-style "Sign in with Angi" account-linking flow used by a short, approved list of CRM and field-ser...15.1 Zatanna MCP ServerZatanna's hosted, remote Model Context Protocol (MCP) server — the agent-facing surface of its reverse-engi...15.1 PiggyVest Business APIThe PiggyVest Business API is a Bearer-token-authenticated REST API hosted at api.piggyvest.business that l...14.6 Zoho Meeting REST APIREST API for creating, updating, and reporting on Zoho Meeting sessions and Zoho Webinar events, including ...14.3 NetSuite SuiteTalk REST Web ServicesREST API exposing NetSuite accounting and financial records as JSON resources including invoices, bills, jo...14.1 CoolerX Website MCP ServerA live, OAuth-protected Model Context Protocol endpoint served by CoolerX from its own apex host and discov...14.0 Linux PAMPluggable Authentication Modules providing flexible, configurable authentication mechanisms for Linux appli...14.0 Green Button Energy Usage Data APIGreen Button is a standardized API for accessing customer energy usage data. Based on the ESPI (Energy Serv...13.9 Open Podcast Authentication APIAuthenticate users against an Open Podcast compliant server, establishing the session used for subsequent s...13.9 SellerX MCP ServerA live, remotely hosted Model Context Protocol server operated by SellerX at mcp.sellerx.com. The endpoint ...13.9 NuPay for Business - Authentication APIOAuth2 app-based authorization, CIBA (Client-Initiated Backchannel Authentication) for web flows, OTP valid...13.7 LastPass MFA SDKServer-side SDK for embedding LastPass MFA (push, biometric, TOTP) into custom cloud or on-prem application...13.4 teamplay Single Sign-On APIAuthentication and identity federation surface that lets partner applications running on the teamplay digit...13.4 ClassPass Partner Certification & Token PortalThe client-side application shell served at developers.classpass.com (inspectable without authenticating) d...13.0 Bitmoji Direct APIOAuth2 (authorization code + PKCE) API for Bitmoji for Developers, providing access to a connected user's a...12.7 Eliq Auth APIThe Eliq Auth API authenticates client applications and issues access tokens used to call the Insights, Dat...12.7 Comcast Authentication API (SAT)The Comcast Security Access Token (SAT) endpoint issues short-lived bearer tokens used to authenticate call...12.6 Refectory Identity (OAuth2 / OpenID Connect)Public OAuth2 / OpenID Connect authorization server (Ory-style) backing the Refectory (Dejbox) consumer and...12.6 LDAPLightweight Directory Access Protocol for accessing and maintaining distributed directory information servi...12.5 Rockstar Games Sign-In (OpenID Connect)Public OpenID Connect / OAuth 2.0 identity provider operated by Rockstar Games at signin.rockstargames.com....12.4 SNMPv3 Architecture (RFC 3411-3418)The modular SNMPv3 management framework. RFC 3411 defines the SNMP engine, Message Processing Subsystem, Se...11.7 Smile CDR SMART on FHIRSMART on FHIR / OAuth2 / OIDC authorization surface for FHIR endpoints, supporting standalone launch, EHR l...11.5 Fluxx OAuth APIOAuth 2.0 authorization for the Fluxx REST API. Administrators register an application at /oauth/applicatio...11.2

Minimal 15 Almost no public developer surface

Autodesk Platform Services - Maya APICloud-based API for Maya through Autodesk Platform Services (APS), providing web service integration, OAuth...10.5 CargoWise REST Integration APIWiseTech's newer integration path (referred to as eAdaptor Next and xHub) adds REST access authenticated wi...10.5 Bukalapak REST APIBukalapak's public REST API for marketplace resources such as products and the authenticated user profile, ...8.9 Green Button Connect My DataGreen Button Connect My Data is the OAuth2-based ESPI service that lets Con Edison customers authorize a re...8.9 Honorlock Authentication APIGenerate the integration and user authentication tokens that authorize an assessment platform to provision ...8.9 Lumen Developer Center APIsThe Lumen Developer Center publishes Lumen's enterprise API catalog, including Location, Quote, Order (PX C...8.9 Number Verification 2.0 (CAMARA)Frictionless mobile-number verification that confirms ownership of the MSISDN currently in use on the devic...8.7 Home Network APIVerify whether a customer's phone is currently connected to EE's mobile network, supporting risk decisionin...8.5 SIM Swap Detection APIQuery when a mobile subscriber's SIM was last changed so relying parties can detect SIM-swap account-takeov...8.5 IDEXX VetConnect PLUS AuthenticationOAuth 2.0-style authentication for IDEXX partner integrations. The developer.vetconnectplus.com portal is l...8.3 Rakuten CPaaS Confirm (OTP) APIOne-time PIN delivery and verification API for two-factor authentication and transaction confirmation, with...7.9 Personify MemberClicks (MC Professional) APIJSON REST API for the MemberClicks MC Professional AMS, secured with OAuth 2.0. Base URL is organization-sc...7.4 island.is GraphQL GatewaySingle GraphQL gateway at api.island.is wrapping internal REST microservices that power island.is applicati...7.2 Shippingbo APIShippingbo's primary REST/JSON API for managing the full e-commerce logistics lifecycle: orders, order item...6.6 Rappi Partners REST APIThe Rappi Partners REST API is the integration surface used by approved restaurants, grocery and retail mer...5.5

Score breakdown

Frequency

97.2

log-scaled weighted occurrences

Breadth

47.8

spread across providers

Quality lift

48.6

mean composite of providers using it

Cohesion

19.8

strength of nearest seed neighbor

Where this tag comes from

Api tag1857

Provider tag415

Openapi tag940

Openapi op tag2719

Asyncapi tag1

Cohort brief

Auto-generated

The 1743 providers in the APIs.io catalog tagged Authentication, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

1743

of 1745 on the roster

Mean Kin Score

39.9

+19.2 vs catalog 20.7

Mean Agent Readiness

24.7

+15.0 vs catalog 9.7

Spread

0.1–85.6

median 39.5 · σ 14.2

How the 1743 split by band

Exemplar 53Strong 225Developing 606Thin 585Emerging 233Minimal 41

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	45	17.5	+27.5	1743
Developer Ergonomics	38.7	17.9	+20.8	1743
Access Clarity	37	22.3	+14.7	1743
Operational Transparency	25.4	11.3	+14.1	1743
Discoverability	73.9	60.4	+13.5	1743
Contract Governance	15.5	6.4	+9.1	1743

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)	38%	16%	+22
MCP server (first-party)	15%	7%	+8
Agent Skills	0%	0%	0
OAuth scopes	34%	9%	+25
Security	99%	88%	+11
Arazzo workflows	7%	2%	+5
Governance rules	31%	13%	+18

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 Kit 85.6
2 Centers for Medicare and Medicaid Services 85.2
3 Elation Health 84.1
4 drchrono 83.5
5 Salesforce 83.3
6 ZoomInfo 80.8
7 Svix 79.2
8 Treasure Data 76.7
9 Nylas 76.2
10 Thanx 76.2

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/authentication"

All tags

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

As a scored cohort

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

The distribution (Pro)

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

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