curl -X POST 'https://api.elevenlabs.io/v1/speech-engine/speech-engine-id/duplicate' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "name": "example-name"
}'

# POST /v1/speech-engine/{speech_engine_id}/duplicate (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-10-01

> Duplicate Speech Engine

## Critical Gotchas
* Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.
* Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (`--output speech.mp3`) rather than parsing it.

## cURL
curl -X POST 'https://api.elevenlabs.io/v1/speech-engine/speech-engine-id/duplicate' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"name":"example-name"}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| speech_engine_id | path | string | Yes | The speech engine ID (accepts seng_ or agent_ prefix) |
| name | body | string | No | Name for the duplicated speech engine. Defaults to the so... |

## Response (200 OK)
{"asr":{"keywords":[],"provider":"elevenlabs"},"call_limits":{"agent_concurrency_limit":-1,"bursting_enabled":true}}

---
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POST

POST /v1/speech-engine/{speech_engine_id}/duplicate — ElevenLabs API

ElevenLabs API

Duplicate Speech Engine

Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-10-01 · upstream hash matched

Actions Try in browser→

Agents: curl -H "Accept: text/markdown" this URL
→ 199 tokens · Vary: Accept

Critical gotchas

Authentication uses the non-standard xi-api-key header, not Authorization: Bearer. Sending a Bearer token returns HTTP 401.

Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (--output speech.mp3) rather than parsing it.

cURL

curl -X POST 'https://api.elevenlabs.io/v1/speech-engine/speech-engine-id/duplicate' \  -H "xi-api-key: $ELEVENLABS_API_KEY" \  -H 'Content-Type: application/json' \  -d '{  "name": "example-name"}'

Parameters

Name	In	Type	Required	Description
speech_engine_id	path	string	Yes	The speech engine ID (accepts seng_ or agent_ prefix)
name	body	string	No	Name for the duplicated speech engine. Defaults to the source name.

Response 200 OK

{
  "asr": {
    "keywords": [],
    "provider": "elevenlabs",
    "quality": "high",
    "user_input_audio_format": "pcm_16000"
  },
  "call_limits": {
    "agent_concurrency_limit": -1,
    "bursting_enabled": true,
    "daily_limit": 100000
  },
  "cascade_timeout_seconds": 4,
  "conversation": {
    "client_events": [
      "audio",
      "interruption",
      "agent_response",
      "user_transcript"
    ],
    "max_duration_seconds": 600
  },
  "language": "en",
  "metadata": {
    "created_at_unix_secs": 1714000000,
    "created_from": "api",
    "last_updated_from": "api",
    "updated_at_unix_secs": 1714000000
  },
  "name": "My Speech Engine",
  "overrides": {
    "first_message": false
  },
  "privacy": {
    "apply_to_existing_conversations": false,
    "delete_audio": false,
    "delete_transcript_and_pii": false,
    "record_voice": true,
    "retention_days": -1,
    "zero_retention_mode": false
  },
  "speech_engine": {
    "request_headers": {},
    "ws_url": "wss://example.com/transcript"
  },
  "speech_engine_id": "seng_3701k3ttaq12ewp8b7qv5rfyszkz",
  "tags": [
    "production",
    "v1"
  ],
  "tts": {
    "agent_output_audio_format": "pcm_16000",
    "model_id": "eleven_flash_v2",
    "optimize_streaming_latency": 3,
    "similarity_boost": 0.8,
    "speed": 1,
    "stability": 0.5,
    "voice_id": "cjVigY5qzO86Huf0OWal"
  },
  "turn": {
    "mode": "turn",
    "silence_end_call_timeout": -1,
    "turn_eagerness": "normal",
    "turn_timeout": 7
  },
  "vad": {
    "background_voice_detection": false
  }
}

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