Clerk
Clerk is a complete authentication and user management platform for web and mobile apps, providing embeddable UI components, SDKs, and REST APIs to handle sign-up and sign-in, users, organizations and memberships, sessions, multi-factor authentication, JWTs and JWT templates, JWKS, SAML/enterprise SSO, OAuth applications, and email/SMS verification. The Clerk Backend API (base https://api.clerk.com/v1, secret-key authenticated) manages these resources server-side, the Frontend API drives client auth flows, and change events are delivered as Svix-powered HTTP webhooks.
Clerk publishes 15 APIs on the APIs.io network, including Allowlist & Blocklist API, Clients API, Email & SMS API, and 12 more. Tagged areas include Authentication, User Management, Identity, Sessions, and Organization.
Clerk’s developer surface includes authentication, documentation, engineering blog, and 9 more developer resources.
Kin Score
APIs 15
Individual APIs this provider publishes, each with its own machine-readable definition.
Clerk Allowlist & Blocklist API
Identifiers permitted or denied from signing up.
Clerk Clients API
Browser / device clients tracking active sessions.
Clerk Email & SMS API
Email addresses, phone numbers, and message templates.
Clerk Invitations API
Application-level sign-up invitations.
Clerk JWKS API
Public keys for verifying Clerk-issued JWTs.
Clerk JWT Templates API
Named claim templates for custom session tokens.
Clerk OAuth Applications API
OAuth applications where Clerk is the identity provider.
Clerk Organization Invitations API
Invitations to join an organization.
Clerk Organization Memberships API
Members of an organization and their roles.
Clerk Organizations API
Multi-tenant organizations.
Clerk SAML & Enterprise Connections API
Enterprise SSO connections.
Clerk Sessions API
User sessions and session tokens.
Clerk Sign-ups & Tokens API
Sign-up attempts, sign-in tokens, and actor tokens.
Clerk Users API
Create and manage users and their identities.
Clerk Webhooks API
Svix-powered webhook portal management.
Scroll for all 15
Open Collections 17
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONClerk Backend Allowlist & Blocklist API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Clients API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Email & SMS API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Invitations API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist JWKS API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist JWT Templates API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist OAuth Applications API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Organizations API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Sessions API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Sign-ups & Tokens API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Users API
OPEN COLLECTIONClerk Backend Allowlist & Blocklist Webhooks API
OPEN COLLECTIONClerk Backend API
OPEN COLLECTIONScroll for all 17
Pricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Clerk Dev Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Clerk Dev Finops
FINOPSSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Source (apis.yml)
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find_providersBrowse and filter every provider in the catalog.get_provider_artifactsEvery artifact this provider publishes, grouped by type.get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.get_provider_toolsEvery MCP tool they ship, with the operation each wraps.get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.get_provider_ratingPRO — composite, band, trend and facet scores.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.
Call it yourself
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curl "https://apis.io/api/v1/providers/clerk-dev"
curl "https://apis.io/api/v1/providers?limit=25"
curl "https://apis.io/api/v1/providers/clerk-dev/operations?limit=25"
curl "https://apis.io/api/v1/providers/clerk-dev/evidence"
Discovery needs no key. Ratings and market analysis are Pro.