Narakeet Text to Speech API

openapi: 3.0.3
info:
  title: Narakeet API
  description: >-
    The Narakeet API turns text and Markdown scripts into narrated audio and
    video programmatically. It exposes a text-to-speech endpoint (returning MP3,
    M4A, or WAV) in two modes - a short-content streaming mode that returns audio
    bytes directly, and a long-content JSON polling mode that returns a status URL
    to poll while a longer build runs asynchronously - plus a Markdown-to-video
    build workflow (upload a zip of the script and assets, trigger a build, then
    poll for the finished MP4), a voice listing endpoint, and an account credits
    endpoint. All build requests authenticate with an `x-api-key` header. API
    access requires a top-up or metered commercial Narakeet account; free and
    unmetered accounts cannot use the API. The default quota is 86,400 requests
    per day (1 per second). Pre-signed status and result URLs returned by the
    polling and video workflows do not require the API key.
  version: '1.0'
  contact:
    name: Narakeet
    url: https://www.narakeet.com
    email: contact@narakeet.com
servers:
  - url: https://api.narakeet.com
    description: Narakeet API
security:
  - apiKeyAuth: []
tags:
  - name: Text to Speech
    description: Build narrated audio (MP3, M4A, WAV) from text, SubRip, or WebVTT input.
  - name: Video
    description: Build video from a Markdown script and assets packaged as a zip archive.
  - name: Voices
    description: List the voices available for audio and video production.
  - name: Account
    description: Check remaining account credits.
paths:
  /text-to-speech/{format}:
    post:
      operationId: buildTextToSpeech
      tags:
        - Text to Speech
      summary: Build speech audio from text
      description: >-
        Converts text (or SubRip / WebVTT subtitle input) into narrated audio.
        Two modes are selected by the `Accept` header. With
        `Accept: application/octet-stream` the endpoint operates as a short-content
        streaming API - input is limited to about 1 KB and the audio bytes are
        returned directly in the response, with the duration in the
        `x-duration-seconds` response header (WAV is not available in this mode).
        Without that Accept header the endpoint operates as a long-content polling
        API - input up to about 1024 KB is accepted and the response is a JSON
        object containing a `statusUrl` to poll. Use `Accept: application/zip` with
        multi-scene input (scenes separated by `---`) for batch audio, or
        `Accept: application/json+vtt` to also receive subtitle result URLs.
      parameters:
        - name: format
          in: path
          required: true
          description: Output audio format. WAV is only available via the polling API.
          schema:
            type: string
            enum:
              - mp3
              - m4a
              - wav
        - name: voice
          in: query
          required: false
          description: Name of the voice to use (see the Voices endpoint for valid names).
          schema:
            type: string
            example: mickey
        - name: voice-speed
          in: query
          required: false
          description: Reading speed multiplier (1.2 = 20% faster, 0.8 = 20% slower).
          schema:
            type: number
            example: 1.1
        - name: voice-volume
          in: query
          required: false
          description: Relative loudness of the narration.
          schema:
            type: string
            example: soft
      requestBody:
        required: true
        description: >-
          The script to narrate. Content-Type text/plain for plain text,
          application/x-subrip (or text/srt) for SubRip, or text/vtt for WebVTT.
        content:
          text/plain:
            schema:
              type: string
              example: Hello from the Narakeet text to speech API.
      responses:
        '200':
          description: >-
            Streaming mode returns the audio bytes directly. Polling mode returns a
            JSON object with a statusUrl to poll for the build result.
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
            application/json:
              schema:
                $ref: '#/components/schemas/BuildTask'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /video/upload-request/zip:
    get:
      operationId: createVideoUploadRequest
      tags:
        - Video
      summary: Request a video upload token
      description: >-
        Requests a pre-signed upload location for a zip archive containing the
        video script and its assets. Returns the pre-signed `url` to PUT the zip
        to, along with the `repository` and `repositoryType` identifiers to pass
        to the build endpoint.
      responses:
        '200':
          description: Upload request created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UploadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /video/build:
    post:
      operationId: buildVideo
      tags:
        - Video
      summary: Trigger a video build
      description: >-
        Starts an asynchronous video build from a previously uploaded zip archive
        (or a public zip URL). Returns a JSON object with a `statusUrl` to poll
        until the build finishes.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VideoBuildRequest'
      responses:
        '200':
          description: Build started.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BuildTask'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /voices:
    get:
      operationId: listVoices
      tags:
        - Voices
      summary: List available voices
      description: >-
        Returns a JSON array of the voices available to your account. This
        endpoint does not consume credits, but each call counts toward the daily
        request quota; caching the result (for example once per day) is
        recommended.
      responses:
        '200':
          description: A list of available voices.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Voice'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /account/credits:
    get:
      operationId: getAccountCredits
      tags:
        - Account
      summary: Get remaining account credits
      description: >-
        Returns the quantity of credit seconds still available on the account,
        together with the billing plan and identity metadata for the API key.
      responses:
        '200':
          description: Account credit balance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AccountCredits'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
  /status:
    get:
      operationId: pollBuildStatus
      tags:
        - Text to Speech
        - Video
      summary: Poll a build status URL
      description: >-
        Represents polling the pre-signed `statusUrl` returned by the polling
        audio build and the video build. The actual URL is time-limited and
        pre-signed, so no API key is required. Poll until `finished` is true, then
        read the `result` download URL. This path is illustrative; always use the
        exact statusUrl returned in the build response.
      responses:
        '200':
          description: Current build status.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BuildStatus'
components:
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
  responses:
    Unauthorized:
      description: Missing or invalid API key, or the account is not eligible for API access.
    TooManyRequests:
      description: The daily request quota (default 86,400 per day, 1 per second) was exceeded.
  schemas:
    BuildTask:
      type: object
      description: Response from a polling audio build or a video build.
      properties:
        statusUrl:
          type: string
          format: uri
          description: Pre-signed URL to poll for build progress and the final result.
    BuildStatus:
      type: object
      description: The state of an asynchronous build, returned when polling the status URL.
      properties:
        message:
          type: string
          description: Status or error message.
        finished:
          type: boolean
          description: True when the build has completed (successfully or not).
        succeeded:
          type: boolean
          description: True when the build finished successfully.
        percent:
          type: integer
          description: Build progress from 0 to 100.
        result:
          type: string
          format: uri
          description: Download URL for the finished audio or video (valid for a limited time).
        poster:
          type: string
          format: uri
          description: Poster image URL for a finished video (video builds only).
        durationInSeconds:
          type: integer
          description: Duration of the produced media in seconds.
    UploadRequest:
      type: object
      description: Pre-signed upload location and identifiers for a video zip archive.
      properties:
        url:
          type: string
          format: uri
          description: Pre-signed URL to PUT the zip archive to (no API key on this request).
        contentType:
          type: string
          description: Content-Type header value to use when uploading the zip.
        repository:
          type: string
          description: Identifier of the uploaded repository, passed to the build endpoint.
        repositoryType:
          type: string
          description: Type of the repository, passed to the build endpoint.
    VideoBuildRequest:
      type: object
      required:
        - source
      properties:
        source:
          type: string
          description: Path to the Markdown or text script inside the uploaded archive.
          example: script.md
        repository:
          type: string
          description: The repository identifier returned by the upload request.
        repositoryType:
          type: string
          description: The repository type returned by the upload request, or a public zip URL type.
    Voice:
      type: object
      description: A voice available for audio and video production.
      properties:
        name:
          type: string
          description: Voice identifier used with the text-to-speech voice query parameter.
          example: mickey
        language:
          type: string
          description: Human-friendly language / dialect description.
          example: English (US)
        languageCode:
          type: string
          description: Locale code.
          example: en-US
        styles:
          type: array
          description: Supported narration styles for the voice.
          items:
            type: string
    AccountCredits:
      type: object
      properties:
        creditSeconds:
          type: integer
          description: Quantity of credit seconds still available for the account.
        requestId:
          type: string
          description: Internal request identifier.
        identity:
          type: string
          description: The API access key ID that made the request.
        billingId:
          type: string
          description: Billing plan identifier.
        plan:
          type: string
          description: Billing plan type (for example, TOPUP).
          example: TOPUP