Listnr

Listnr Text-to-Speech API

Convert SSML text or an article URL into audio.

GitHub OpenAPI

Operations 4

POST /convert-text Convert SSML text to speech (synchronous) #
POST /convert-text-async Convert SSML text to speech (asynchronous) #
POST /convert-url Convert an article URL to speech (synchronous) #
POST /convert-url-async Convert an article URL to speech (asynchronous) #

Documentation

📖
Documentation
https://listnr.ai/text-to-speech-api
📖
APIReference
https://github.com/team-listnr/text-to-speech-api

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/listnr/refs/heads/main/openapi/listnr-text-to-speech-api-openapi.yml

Other Resources

🔗
PostmanCollection
https://raw.githubusercontent.com/api-evangelist/listnr/refs/heads/main/collections/listnr.postman_collection.json
🔗
OpenCollection
https://raw.githubusercontent.com/api-evangelist/listnr/refs/heads/main/collections/listnr.opencollection.json

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OpenAPI Specification

listnr-text-to-speech-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Listnr Jobs Text To Speech API
  description: The Listnr Text-to-Speech API converts SSML text or an article URL into MP3/WAV speech using Listnr's catalog of 1,000+ AI voices across 142+ languages. Conversion can be synchronous (returns an audio URL directly) or asynchronous (returns a jobId that is polled for status). The API also lists available voices and reports async job status. All requests are authenticated with a personal API key generated in the Listnr dashboard (voices.listnr.tech) and passed in an x-listnr-token header. Never expose the API key in front-end code or the browser. Endpoints and parameters in this document are transcribed from Listnr's public API documentation at github.com/team-listnr/text-to-speech-api; request/response schemas are modeled from that documentation and should be verified against the live API.
  version: '1.0'
  contact:
    name: Listnr AI
    url: https://listnr.ai
servers:
- url: https://bff.listnr.tech/api/tts/v1
  description: Listnr Text-to-Speech API
security:
- listnrToken: []
tags:
- name: Text-to-Speech
  description: Convert SSML text or an article URL into audio.
paths:
  /convert-text:
    post:
      operationId: convertText
      tags:
      - Text-to-Speech
      summary: Convert SSML text to speech (synchronous)
      description: Synchronously converts SSML text into audio and returns the resulting audio URL.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ConvertTextRequest'
      responses:
        '200':
          description: Audio generated successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SyncConversionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /convert-text-async:
    post:
      operationId: convertTextAsync
      tags:
      - Text-to-Speech
      summary: Convert SSML text to speech (asynchronous)
      description: Queues an asynchronous conversion of SSML text and returns a jobId to poll via the job-status endpoint.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ConvertTextRequest'
      responses:
        '200':
          description: Job accepted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AsyncConversionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /convert-url:
    post:
      operationId: convertUrl
      tags:
      - Text-to-Speech
      summary: Convert an article URL to speech (synchronous)
      description: Synchronously converts the readable content of an article URL into audio and returns the resulting audio URL.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ConvertUrlRequest'
      responses:
        '200':
          description: Audio generated successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SyncConversionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /convert-url-async:
    post:
      operationId: convertUrlAsync
      tags:
      - Text-to-Speech
      summary: Convert an article URL to speech (asynchronous)
      description: Queues an asynchronous conversion of an article URL and returns a jobId to poll via the job-status endpoint.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ConvertUrlRequest'
      responses:
        '200':
          description: Job accepted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AsyncConversionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    ConvertUrlRequest:
      type: object
      required:
      - voice
      - url
      properties:
        voice:
          type: string
          description: The voice identifier to synthesize with.
        url:
          type: string
          format: uri
          description: The article URL whose readable content will be converted.
        voiceStyle:
          type: string
          description: Optional tone or accent of the voice.
        globalSpeed:
          type: string
          description: Playback speed as a percentage string, e.g. "100%" (20-200).
        audioFormat:
          type: string
          enum:
          - mp3
          - wav
          description: Output audio format.
        audioSampleRate:
          type: integer
          enum:
          - 24000
          - 48000
          description: Output audio sample rate in Hz.
        audioKey:
          type: string
          description: Optional key referencing an existing audio file to update.
    Error:
      type: object
      properties:
        success:
          type: boolean
        message:
          type: string
    AsyncConversionResponse:
      type: object
      properties:
        jobId:
          type: string
          description: Identifier of the queued conversion job.
        audioKey:
          type: string
          description: Key that will identify the generated audio file.
    SyncConversionResponse:
      type: object
      properties:
        success:
          type: boolean
        audioUrl:
          type: string
          format: uri
          description: URL of the generated audio file.
        audioKey:
          type: string
          description: Key identifying the generated audio file.
    ConvertTextRequest:
      type: object
      required:
      - voice
      - ssml
      properties:
        voice:
          type: string
          description: The voice identifier to synthesize with.
        ssml:
          type: string
          description: The text to convert, in SSML format with paragraph tags.
        voiceStyle:
          type: string
          description: Optional tone or accent of the voice.
        globalSpeed:
          type: string
          description: Playback speed as a percentage string, e.g. "100%" (20-200).
        audioFormat:
          type: string
          enum:
          - mp3
          - wav
          description: Output audio format.
        audioSampleRate:
          type: integer
          enum:
          - 24000
          - 48000
          description: Output audio sample rate in Hz.
        audioKey:
          type: string
          description: Optional key referencing an existing audio file to update.
  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    listnrToken:
      type: apiKey
      in: header
      name: x-listnr-token
      description: Personal API key generated in the Listnr dashboard at voices.listnr.tech. Keep it server-side; never expose it in the browser or front-end code.