Mathpix App Tokens API

openapi: 3.1.0
info:
  title: Mathpix App Tokens API
  description: >
    Mint short-lived client-side tokens so browsers, mobile apps, and digital-ink surfaces can call
    Mathpix without exposing your long-lived app_key. Tokens default to 5 minutes and can be issued
    from 30 seconds to 12 hours. Token issuance is free.
  version: v3
  contact:
    name: Mathpix Support
    url: https://docs.mathpix.com
    email: support@mathpix.com
  license:
    name: Mathpix Terms of Service
    url: https://mathpix.com/terms-of-service
servers:
  - url: https://api.mathpix.com
    description: Production Server
security:
  - AppKeyAuth: []
tags:
  - name: App Tokens
    description: Issue temporary client-side tokens.
paths:
  /v3/app-tokens:
    post:
      summary: Create An App Token
      description: Mint a temporary app_token for client-side use. Authenticated with the long-lived app_key only.
      operationId: createAppToken
      tags:
        - App Tokens
      parameters:
        - name: app_key
          in: header
          required: true
          schema:
            type: string
          description: Long-lived Mathpix application secret.
        - name: Content-Type
          in: header
          required: true
          schema:
            type: string
            default: application/json
      requestBody:
        required: false
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AppTokenRequest'
      responses:
        '200':
          description: Token issued.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AppTokenResponse'
components:
  securitySchemes:
    AppKeyAuth:
      type: apiKey
      in: header
      name: app_key
  schemas:
    AppTokenRequest:
      type: object
      properties:
        expires:
          type: integer
          description: Token lifetime in seconds. Minimum 30, maximum 43200 (12 hours). Default 300.
          minimum: 30
          maximum: 43200
          default: 300
        include_strokes_session_id:
          type: boolean
          description: When true, the response includes a strokes_session_id for digital-ink capture sessions.
    AppTokenResponse:
      type: object
      properties:
        app_token:
          type: string
          description: Short-lived bearer token to send as the app_token header from client code.
        app_token_expires_at:
          type: integer
          description: Unix epoch seconds when the token expires.
        strokes_session_id:
          type: string
          description: Optional session identifier for digital-ink workflows.