Clerk Clients API

openapi: 3.0.3
info:
  title: Clerk Backend Allowlist & Blocklist Clients API
  description: 'The Clerk Backend API manages Clerk''s authentication and user management resources server-side: users, organizations and memberships, sessions, clients, sign-ups, JWT templates, JWKS, email/SMS verification and templates, allowlist/blocklist identifiers, invitations, SAML/enterprise connections, OAuth applications, and Svix-powered webhooks. The base URL is https://api.clerk.com/v1 and every request (except GET /jwks and the public interstitial) is authenticated with your instance Secret Key passed as `Authorization: Bearer sk_...`. This description is grounded in Clerk''s published OpenAPI spec (github.com/clerk/openapi-specs, bapi) but is a curated subset covering the primary resource groups; it does not enumerate every parameter or schema property. Verify the current version-dated spec on GitHub for the authoritative contract.'
  version: '2026-05-12'
  contact:
    name: Clerk
    url: https://clerk.com
  license:
    name: Clerk Documentation
    url: https://clerk.com/docs
servers:
- url: https://api.clerk.com/v1
  description: Clerk Backend API
security:
- bearerAuth: []
tags:
- name: Clients
  description: Browser / device clients tracking active sessions.
paths:
  /clients:
    get:
      operationId: getClientList
      tags:
      - Clients
      summary: List all clients
      responses:
        '200':
          description: A list of clients.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Client'
  /clients/verify:
    post:
      operationId: verifyClient
      tags:
      - Clients
      summary: Verify a client
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                token:
                  type: string
      responses:
        '200':
          description: The verified client.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Client'
  /clients/{client_id}:
    parameters:
    - name: client_id
      in: path
      required: true
      schema:
        type: string
    get:
      operationId: getClient
      tags:
      - Clients
      summary: Retrieve a client
      responses:
        '200':
          description: The requested client.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Client'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    Client:
      type: object
      properties:
        id:
          type: string
        object:
          type: string
        session_ids:
          type: array
          items:
            type: string
        last_active_session_id:
          type: string
          nullable: true
        created_at:
          type: integer
    ClerkErrors:
      type: object
      properties:
        errors:
          type: array
          items:
            type: object
            properties:
              message:
                type: string
              long_message:
                type: string
              code:
                type: string
        clerk_trace_id:
          type: string
  responses:
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ClerkErrors'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Your Clerk instance Secret Key (starts with sk_test_ or sk_live_) passed as `Authorization: Bearer YOUR_SECRET_KEY`.'