WellSaid Text-to-Speech API

openapi: 3.0.1
info:
  title: WellSaid Labs API
  description: >-
    REST API for WellSaid Labs AI text-to-speech. Render text to speech using
    studio-quality voice avatars via synchronous clip creation, low-latency
    audio streaming, and word-timing renders with subtitles. Authentication is
    performed with an X-Api-Key request header.
  termsOfService: https://wellsaidlabs.com/terms/
  contact:
    name: WellSaid Labs Support
    url: https://docs.wellsaidlabs.com
  version: '1.0'
servers:
  - url: https://api.wellsaidlabs.com/v1
security:
  - ApiKeyAuth: []
tags:
  - name: Text-to-Speech
    description: Render text to speech as clips or audio streams.
  - name: Clips
    description: Manage rendered clips.
  - name: Voices
    description: Discover available voice avatars.
  - name: Pronunciation
    description: Respelling suggestions and replacement libraries.
paths:
  /tts/stream:
    post:
      operationId: streamTextToSpeech
      tags:
        - Text-to-Speech
      summary: Render text to speech as an audio stream.
      description: >-
        Renders the supplied text to speech with the chosen voice avatar and
        streams the result back as an audio/mpeg (MP3) stream as it is produced.
      parameters:
        - name: X-Enable-SSML
          in: header
          required: false
          description: Enables limited SSML translation for the input text.
          schema:
            type: boolean
        - name: Accept
          in: header
          required: false
          description: Desired audio media type for the streamed response.
          schema:
            type: string
            default: audio/mpeg
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RenderRequest'
      responses:
        '200':
          description: Audio stream from a successful text-to-speech render.
          content:
            audio/mpeg:
              schema:
                type: string
                format: binary
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '508':
          description: >-
            Render loop detected. Likely a result of unusual phrasing,
            characters, and/or punctuation in the input text.
  /tts/clips:
    post:
      operationId: createClip
      tags:
        - Text-to-Speech
        - Clips
      summary: Create a new TTS clip asynchronously.
      description: >-
        Submits a text-to-speech render request and creates a clip that is
        produced asynchronously. Poll the clip endpoint to retrieve status and
        the rendered audio.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RenderRequest'
      responses:
        '200':
          description: The created clip.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Clip'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
    get:
      operationId: listClips
      tags:
        - Clips
      summary: Get a list of recent clips.
      responses:
        '200':
          description: A list of recent clips.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Clip'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /tts/clips/{clip-id}:
    get:
      operationId: getClip
      tags:
        - Clips
      summary: Get information about a single clip.
      parameters:
        - name: clip-id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Information about a single clip.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Clip'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Clip not found.
  /tts/clips/combine:
    post:
      operationId: combineClips
      tags:
        - Clips
      summary: Combine a list of clips into a single file with pauses.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CombineClipsRequest'
      responses:
        '200':
          description: Combined audio file.
          content:
            audio/mpeg:
              schema:
                type: string
                format: binary
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /tts/word-timing:
    post:
      operationId: renderWordTiming
      tags:
        - Text-to-Speech
      summary: Render text to speech with timing information and subtitles.
      description: >-
        Renders the supplied text to speech and returns a zip file containing
        the generated audio along with word-level timing as JSON, SRT, and VTT
        subtitle files.
      parameters:
        - name: X-Enable-SSML
          in: header
          required: false
          description: Enables limited SSML translation for the input text.
          schema:
            type: boolean
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RenderRequest'
      responses:
        '200':
          description: >-
            Zip archive containing the rendered audio plus JSON, SRT, and VTT
            timing files.
          content:
            application/zip:
              schema:
                type: string
                format: binary
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
        '508':
          description: Render loop detected.
  /tts/avatars:
    get:
      operationId: getAvatars
      tags:
        - Voices
      summary: Get available voice avatars.
      description: >-
        Returns the list of available voice avatars with their speaker_id,
        name, accent, and speaking style for selecting a voice to render with.
      responses:
        '200':
          description: A list of available voice avatars.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Avatar'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /tts/respelling-suggestions:
    get:
      operationId: getRespellingSuggestions
      tags:
        - Pronunciation
      summary: Get respelling suggestions.
      description: >-
        Returns suggested respellings that shape the pronunciation of a word
        for use in renders or replacement libraries.
      parameters:
        - name: word
          in: query
          required: false
          schema:
            type: string
      responses:
        '200':
          description: Respelling suggestions.
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string
        '401':
          $ref: '#/components/responses/Unauthorized'
  /tts/replacement-libraries:
    get:
      operationId: listReplacementLibraries
      tags:
        - Pronunciation
      summary: Get list of available replacement libraries.
      responses:
        '200':
          description: A list of replacement libraries.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/ReplacementLibrary'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createReplacementLibrary
      tags:
        - Pronunciation
      summary: Create a new replacement library.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ReplacementLibrary'
      responses:
        '200':
          description: The created replacement library.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ReplacementLibrary'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /tts/replacement-libraries/{library-id}:
    get:
      operationId: getReplacementLibrary
      tags:
        - Pronunciation
      summary: Get information about a single replacement library.
      parameters:
        - name: library-id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: A single replacement library.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ReplacementLibrary'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Replacement library not found.
    delete:
      operationId: deleteReplacementLibrary
      tags:
        - Pronunciation
      summary: Delete a replacement library.
      parameters:
        - name: library-id
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Replacement library deleted.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Replacement library not found.
  /tts/replacement-libraries/{library-id}/replacements:
    get:
      operationId: listReplacements
      tags:
        - Pronunciation
      summary: Get list of replacements in a library.
      parameters:
        - name: library-id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: A list of replacements.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Replacement'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createReplacement
      tags:
        - Pronunciation
      summary: Create a new replacement in a library.
      parameters:
        - name: library-id
          in: path
          required: true
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Replacement'
      responses:
        '200':
          description: The created replacement.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Replacement'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /tts/replacement-libraries/{library-id}/replacements/{replacement-id}:
    get:
      operationId: getReplacement
      tags:
        - Pronunciation
      summary: Get details of a replacement.
      parameters:
        - name: library-id
          in: path
          required: true
          schema:
            type: string
        - name: replacement-id
          in: path
          required: true
          schema:
            type: string
      responses:
        '200':
          description: A single replacement.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Replacement'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Replacement not found.
    delete:
      operationId: deleteReplacement
      tags:
        - Pronunciation
      summary: Delete a replacement.
      parameters:
        - name: library-id
          in: path
          required: true
          schema:
            type: string
        - name: replacement-id
          in: path
          required: true
          schema:
            type: string
      responses:
        '204':
          description: Replacement deleted.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          description: Replacement not found.
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-Api-Key
  responses:
    BadRequest:
      description: Request failed input validation.
    Unauthorized:
      description: API key missing or invalid.
    TooManyRequests:
      description: Rate limit exceeded.
  schemas:
    RenderRequest:
      type: object
      required:
        - speaker_id
        - text
      properties:
        speaker_id:
          type: integer
          description: Identifier of the voice avatar (speaker) to render with.
          example: 50
        text:
          type: string
          minLength: 1
          maxLength: 1000
          description: The input text to render to speech.
          example: I love building and shipping new features for our users!
        model:
          type: string
          enum:
            - legacy
            - caruso
          description: The TTS model to render with.
        library_ids:
          type: array
          description: Optional replacement library identifiers to apply during the render.
          items:
            type: string
        audio_configs:
          type: object
          description: Optional audio configuration settings for the render.
          additionalProperties: true
    Clip:
      type: object
      properties:
        id:
          type: string
        status:
          type: string
          description: Processing status of the asynchronous render.
        speaker_id:
          type: integer
        text:
          type: string
        url:
          type: string
          description: URL of the rendered audio when available.
    CombineClipsRequest:
      type: object
      required:
        - clip_ids
      properties:
        clip_ids:
          type: array
          items:
            type: string
        pause:
          type: number
          description: Pause in seconds inserted between combined clips.
    Avatar:
      type: object
      properties:
        speaker_id:
          type: integer
        avatar_id:
          type: integer
        name:
          type: string
        accent:
          type: string
        style:
          type: string
          description: Speaking style of the voice avatar.
    ReplacementLibrary:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
    Replacement:
      type: object
      properties:
        id:
          type: string
        original:
          type: string
          description: The original word or phrase to replace.
        replacement:
          type: string
          description: The respelling or replacement applied during rendering.