Speech APIActive

elevenlabs-v3 API

Generate ultra-realistic multi-voice dialogue with the ElevenLabs V3 API via API in One. Natural-sounding AI voices with multi-character conversations. 28 credits per 1000 characters. Free credits on sign up.

Get API Key View Docs

Live capabilities

These capabilities come from the current model config and backend route. Unreleased APIs are not listed.

Multi

Multi-character dialogue in a single request

No separate ElevenLabs subscription needed

30+ languages with automatic language detection

Same API key for TTS

Same API key for TTS, images, video, music, and chat

Request format

Clients call same-origin API routes; the server BFF forwards to the matching Worker.

MethodEndpointCreditsPurpose

POST/api/v1/audio/speech1 credits

Ultra-realistic text-to-speech with natural sounding voices. Supports multiple languages and voice styles.

Parameters

dialoguearray

Array of dialogue items: [{text: "...", voice: "..."}]. Voice is optional.

Required

stabilitynumber

Voice stability (0–1). Lower = more variation, higher = more consistent.

Optional · Default 0.5

language_codestring

Language code (e.g. en, zh, ja) or "auto" for detection

Optional · Default auto

Example request

{
  "endpoint": "/api/v1/audio/speech",
  "headers": {
    "Authorization": "Bearer <API_KEY>",
    "Content-Type": "application/json"
  },
  "body": {
    "model": "elevenlabs-v3",
    "dialogue": [
      {
        "text": "Hello, welcome to API in One.",
        "voice": "narrator"
      },
      {
        "text": "Thank you! Tell me more about this platform.",
        "voice": "user"
      }
    ],
    "stability": 0.5,
    "language_code": "auto"
  }
}

Task status route

After creating image, video, audio, or tool tasks, poll the real task endpoint for results.

GET/api/v1/tasks/{task_id}Check generation task status and result.

Pricing

1 credit minimum (~$0.01), then 28 credits per 1000 chars (~$0.28)

Base cost$0.01

Credits1

BillingSuccessful requests

Use cases

These workflows are supported by the current model and backend node.

Generate multi-character dialogue for podcasts and audiobooks

Build voice-enabled chatbots and virtual assistants

Create audiobook content with multiple narrators

Generate multilingual voice content for global audiences

FAQ

How much does the ElevenLabs API cost through API in One?

Pricing is 28 credits per 1000 characters (~$0.28). The final cost scales with text length.

What languages does the ElevenLabs V3 API support?

ElevenLabs V3 supports 30+ languages. Set language_code to "auto" for automatic detection or specify a language code.

Can I create multi-voice dialogue?

Yes. The dialogue parameter accepts an array of objects, each with text and an optional voice. This enables multi-character conversations.

What is the stability parameter?

The stability parameter (0–1) controls voice consistency. Lower values (0.3) add more variation, higher values (0.8) produce more consistent output. Default is 0.5.