Smallest AI Voices API

openapi: 3.2.0
info:
  title: Smallest AI Waves Streaming Voices API
  description: The Smallest AI Waves text-to-speech API. Generates natural speech from text using the Lightning family of models with sub-100ms latency, streams audio in realtime over Server-Sent Events, lists prebuilt voices, and clones custom voices from short audio samples. All endpoints are authenticated with a Bearer API key. The realtime bidirectional WebSocket transport for streaming TTS is modeled in the companion AsyncAPI document (asyncapi/smallest-ai-asyncapi.yml).
  termsOfService: https://smallest.ai/terms
  contact:
    name: Smallest AI Support
    url: https://smallest.ai/
    email: support@smallest.ai
  version: '1.0'
servers:
- url: https://waves-api.smallest.ai/api/v1
  description: Waves production API
security:
- bearerAuth: []
tags:
- name: Voices
  description: List prebuilt voices and manage cloned voices.
paths:
  /lightning/get_voices:
    get:
      operationId: getVoices
      tags:
      - Voices
      summary: List available voices.
      description: Returns the catalog of prebuilt voices available for synthesis, including each voice's identifier and metadata such as language, gender, and accent.
      responses:
        '200':
          description: A list of available voices.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VoiceList'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /lightning/add_voice:
    post:
      operationId: addVoice
      tags:
      - Voices
      summary: Clone a voice.
      description: Creates a new cloned voice from a short reference audio sample. The resulting voice identifier can be used as the `voice_id` in synthesis requests.
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/AddVoiceRequest'
      responses:
        '200':
          description: The created cloned voice.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Voice'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /lightning/get_cloned_voices:
    get:
      operationId: getClonedVoices
      tags:
      - Voices
      summary: List cloned voices.
      description: Returns the voices that the authenticated account has cloned.
      responses:
        '200':
          description: A list of cloned voices.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VoiceList'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /lightning/delete_voice/{voiceId}:
    delete:
      operationId: deleteVoice
      tags:
      - Voices
      summary: Delete a cloned voice.
      description: Permanently deletes a previously cloned voice owned by the account.
      parameters:
      - name: voiceId
        in: path
        required: true
        description: Identifier of the cloned voice to delete.
        schema:
          type: string
      responses:
        '200':
          description: The voice was deleted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DeleteResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: The voice was not found.
components:
  schemas:
    AddVoiceRequest:
      type: object
      required:
      - displayName
      - file
      properties:
        displayName:
          type: string
          description: Human-readable name for the cloned voice.
          example: My Brand Voice
        file:
          type: string
          format: binary
          description: Reference audio sample (e.g. WAV/MP3) to clone the voice from.
    Voice:
      type: object
      properties:
        voiceId:
          type: string
          description: Unique identifier used as `voice_id` in synthesis requests.
        displayName:
          type: string
          description: Human-readable voice name.
        language:
          type: string
          description: Primary language of the voice.
        gender:
          type: string
          description: Voice gender, when available.
        accent:
          type: string
          description: Voice accent, when available.
        tags:
          type: array
          description: Descriptive tags for the voice.
          items:
            type: string
    Error:
      type: object
      properties:
        status:
          type: string
          description: Error status indicator.
        message:
          type: string
          description: Human-readable error message.
        error:
          type: string
          description: Error code or detail, when present.
    DeleteResponse:
      type: object
      properties:
        status:
          type: string
          example: success
        message:
          type: string
    VoiceList:
      type: object
      properties:
        voices:
          type: array
          items:
            $ref: '#/components/schemas/Voice'
  responses:
    ValidationError:
      description: The request body failed validation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Pass your Waves API key as a Bearer token in the Authorization header: `Authorization: Bearer <SMALLEST_API_KEY>`.'