curl -X POST 'https://api.elevenlabs.io/v1/sound-generation?output_format=mp3_22050_32' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "text": "string",
  "loop": false,
  "duration_seconds": 0,
  "prompt_influence": 0.3,
  "model_id": "eleven_text_to_sound_v2"
}'

# POST /v1/sound-generation (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Sound Generation

## 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/sound-generation?output_format=mp3_22050_32' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"text":"string","loop":false}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| text | body | string | Yes | The text that will get converted into... |
| output_format | query | string | No | Output format of the generated audio.... |
| loop | body | boolean | No | Whether to create a sound effect that... |

## Response (200 OK)
"binary"

---
Need an API key? Get one at https://elevenlabs.io/app/sign-up

POST

/v1/sound-generation

ElevenLabs API

Sound Generation

Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03 · upstream hash matched

Actions

Agents: curl -H "Accept: text/markdown" this URL
→ 212 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/sound-generation?output_format=mp3_22050_32' \  -H "xi-api-key: $ELEVENLABS_API_KEY" \  -H 'Content-Type: application/json' \  -d '{  "text": "string",  "loop": false,  "duration_seconds": 0,  "prompt_influence": 0.3,  "model_id": "eleven_text_to_sound_v2"}'

Get a free ElevenLabs API key → sponsored

Parameters

Name	In	Type	Required	Description
output_format	query	string	No	Output format of the generated audio. Formatted as codec_sample_rate_bitrate. So an mp3 with 22.05kHz sample rate at 32kbs is represented as mp3_22050_32. MP3 with 192kbps bitrate requires you to be subscribed to Creator tier or above. PCM with 44.1kHz sample rate requires you to be subscribed to Pro tier or above. Note that the μ-law format (sometimes written mu-law, often approximated as u-law) is commonly used for Twilio audio inputs.
text	body	string	Yes	The text that will get converted into a sound effect.
loop	body	boolean	No	Whether to create a sound effect that loops smoothly. Only available for the 'eleven_text_to_sound_v2 model'.
duration_seconds	body	number	No	The duration of the sound which will be generated in seconds. Must be at least 0.5 and at most 30. If set to None we will guess the optimal duration using the prompt. Defaults to None.
prompt_influence	body	number	No	A higher prompt influence makes your generation follow the prompt more closely while also making generations less variable. Must be a value between 0 and 1. Defaults to 0.3.
model_id	body	string	No	Request body field model_id.

Response 200 OK

"binary"