MiniMax Text-to-Speech (T2A) WebSocket API

asyncapi: 2.6.0
info:
  title: MiniMax Text-to-Speech (T2A) WebSocket API
  version: '1.0'
  description: >-
    MiniMax publishes a documented real-time text-to-speech WebSocket API. A
    client opens a WebSocket connection to wss://api.minimax.io/ws/v1/t2a_v2
    (US West: wss://api-uw.minimax.io/ws/v1/t2a_v2), authenticates with a Bearer
    API key, sends a task_start event with the model and voice settings, streams
    text with task_continue events, and receives audio chunks pushed back over the
    same connection as they are synthesized. This is a genuine bidirectional
    server-push transport, distinct from the synchronous HTTP T2A endpoint.

    This document models the event flow from MiniMax's published WebSocket guide.
    Exact event field names should be reconciled against the live reference.
  x-transport-notes: >-
    Transport is WebSocket (wss). This is separate from and in addition to the
    synchronous HTTP POST /v1/t2a_v2 endpoint. Video generation, by contrast, is
    asynchronous HTTP polling (create task / query / retrieve) and has no
    WebSocket surface.
servers:
  production:
    url: api.minimax.io
    protocol: wss
    pathname: /ws/v1/t2a_v2
    description: MiniMax International real-time T2A WebSocket.
    security:
      - bearerAuth: []
  us-west:
    url: api-uw.minimax.io
    protocol: wss
    pathname: /ws/v1/t2a_v2
    description: US West region, lower time-to-first-audio.
    security:
      - bearerAuth: []
channels:
  /ws/v1/t2a_v2:
    description: >-
      Real-time text-to-speech session. The client drives the session with
      task_start / task_continue / task_finish events; the server streams
      connected_success, then audio_chunk events, then task_finished.
    subscribe:
      operationId: receiveAudioEvents
      summary: Audio and status events pushed from MiniMax to the client.
      message:
        oneOf:
          - $ref: '#/components/messages/ConnectedSuccess'
          - $ref: '#/components/messages/AudioChunk'
          - $ref: '#/components/messages/TaskFinished'
    publish:
      operationId: sendControlEvents
      summary: Control events sent from the client to MiniMax.
      message:
        oneOf:
          - $ref: '#/components/messages/TaskStart'
          - $ref: '#/components/messages/TaskContinue'
          - $ref: '#/components/messages/TaskFinish'
components:
  securitySchemes:
    bearerAuth:
      type: httpApiKey
      name: Authorization
      in: header
      description: 'Bearer API key: Authorization: Bearer {api_key}.'
  messages:
    TaskStart:
      name: task_start
      title: Start a synthesis task
      payload:
        type: object
        properties:
          event:
            type: string
            const: task_start
          model:
            type: string
            example: speech-2.6-hd
          voice_setting:
            type: object
            properties:
              voice_id:
                type: string
                example: male-qn-qingse
              speed:
                type: number
              vol:
                type: number
              pitch:
                type: integer
          audio_setting:
            type: object
            properties:
              sample_rate:
                type: integer
                example: 32000
              format:
                type: string
                example: mp3
    TaskContinue:
      name: task_continue
      title: Stream text to synthesize
      payload:
        type: object
        properties:
          event:
            type: string
            const: task_continue
          text:
            type: string
            example: Streaming text to be spoken in real time.
    TaskFinish:
      name: task_finish
      title: End the synthesis task
      payload:
        type: object
        properties:
          event:
            type: string
            const: task_finish
    ConnectedSuccess:
      name: connected_success
      title: Connection established
      payload:
        type: object
        properties:
          event:
            type: string
            const: connected_success
          session_id:
            type: string
    AudioChunk:
      name: audio_chunk
      title: Streamed audio chunk
      payload:
        type: object
        properties:
          event:
            type: string
            const: task_continued
          data:
            type: object
            properties:
              audio:
                type: string
                description: Hex-encoded audio chunk.
    TaskFinished:
      name: task_finished
      title: Task complete
      payload:
        type: object
        properties:
          event:
            type: string
            const: task_finished
          extra_info:
            type: object