Stable Audio 3 API - AI Music and Audio Generation APIs: Pricing, Documentation

Stable Audio 3 API delivers a powerful and direct way to build high-quality music and sound effects right into your own apps. Created by Stability AI, this cutting-edge tool uses advanced artificial intelligence to turn simple text prompts into clear, commercial-grade audio tracks. Users can easily control the style, rhythm, and length of the music to match their exact needs without relying on any outside middleware or extra software layers. It gives developers a smooth, reliable pipeline to generate custom audio on demand, making it perfect for video games, content creation tools, and modern digital media platforms.

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Stable Audio 3 API Documentation

https://gateway.pixazo.ai/stable-audio-3-small-music-text-to-audio/v1/stable-audio-3-small-music-text-to-audio-request

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Stable Audio 3 Small Music Text to Audio generate request

Request Code

POST https://gateway.pixazo.ai/stable-audio-3-small-music-text-to-audio/v1/stable-audio-3-small-music-text-to-audio-request
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_API_KEY

{
  "prompt": "Upbeat lo-fi hip hop with mellow piano, warm bassline, and crisp drums",
  "negative_prompt": "",
  "duration": 30,
  "num_inference_steps": 8,
  "guidance_scale": 1,
  "output_format": "mp3",
  "bitrate": "192k",
  "enable_prompt_expansion": false,
  "enable_safety_checker": true,
  "sync_mode": false
}

import requests

url = "https://gateway.pixazo.ai/stable-audio-3-small-music-text-to-audio/v1/stable-audio-3-small-music-text-to-audio-request"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_API_KEY"
}
data = {
    "prompt": "Upbeat lo-fi hip hop with mellow piano, warm bassline, and crisp drums",
    "negative_prompt": "",
    "duration": 30,
    "num_inference_steps": 8,
    "guidance_scale": 1,
    "output_format": "mp3",
    "bitrate": "192k",
    "enable_prompt_expansion": false,
    "enable_safety_checker": true,
    "sync_mode": false
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = "https://gateway.pixazo.ai/stable-audio-3-small-music-text-to-audio/v1/stable-audio-3-small-music-text-to-audio-request";

const data = {
  prompt: "Upbeat lo-fi hip hop with mellow piano, warm bassline, and crisp drums",
  negative_prompt: "",
  duration: 30,
  num_inference_steps: 8,
  guidance_scale: 1,
  output_format: "mp3",
  bitrate: "192k",
  enable_prompt_expansion: false,
  enable_safety_checker: true,
  sync_mode: false
};

fetch(url, {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_API_KEY"
  },
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data));

curl -X POST "https://gateway.pixazo.ai/stable-audio-3-small-music-text-to-audio/v1/stable-audio-3-small-music-text-to-audio-request" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  --data-raw '{
    "prompt": "Upbeat lo-fi hip hop with mellow piano, warm bassline, and crisp drums",
    "negative_prompt": "",
    "duration": 30,
    "num_inference_steps": 8,
    "guidance_scale": 1,
    "output_format": "mp3",
    "bitrate": "192k",
    "enable_prompt_expansion": false,
    "enable_safety_checker": true,
    "sync_mode": false
  }'

Output

{
  "request_id": "stable-audio-3-small-music-text-to-audio_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/stable-audio-3-small-music-text-to-audio_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

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Webhook (Optional)

Add the X-Webhook-URL header to your generate request to receive a POST callback instead of polling.

X-Webhook-URL: https://your-server.com/webhook/callback

Request Parameters - Stable Audio 3 Small Music Text to Audio generate request

Parameter	Required	Type	Default	Allowed values / range	Description
prompt	Yes	string	—	—	Text description of the audio to generate. Must be descriptive and specific for best results.
negative_prompt	No	string	""	—	Qualities to avoid in the output, such as "distorted vocals" or "heavy reverb".
duration	No	float	30	1–120	Output length in seconds. Allowed range: 1 to 120.
num_inference_steps	No	integer	8	1–100	Number of sampling steps during generation. Higher values improve quality at the cost of speed.
guidance_scale	No	float	1	0–25	Classifier-free guidance scale. Controls how closely the output follows the prompt.
output_format	No	enum	"mp3"	"mp3", "wav", "flac", "ogg", "opus", "m4a", "aac"	Audio file format.
bitrate	No	string	"192k"	—	Audio bitrate. Examples: "192k", "320k", "128k". Higher bitrates improve quality but increase file size.
enable_prompt_expansion	No	boolean	false	—	Enables LLM-based prompt enhancement to enrich and expand the input description.
enable_safety_checker	No	boolean	true	—	Enables NSFW content filtering. Disabling may allow inappropriate content.
seed	No	integer	—	—	Random seed for reproducible results. Use the same seed with identical parameters to generate identical outputs.
sync_mode	No	boolean	false	—	If true, returns the audio as a base64-encoded data URI inline in the response. If false, returns a request_id for asynchronous polling.

Example Request

{
  "prompt": "Upbeat lo-fi hip hop with mellow piano, warm bassline, and crisp drums",
  "negative_prompt": "",
  "duration": 30,
  "num_inference_steps": 8,
  "guidance_scale": 1,
  "output_format": "mp3",
  "bitrate": "192k",
  "enable_prompt_expansion": false,
  "enable_safety_checker": true,
  "sync_mode": false
}

Response

{
  "request_id": "stable-audio-3-small-music-text-to-audio_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/stable-audio-3-small-music-text-to-audio_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_API_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'stable-audio-3-small-music-text-to-audio' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "stable-audio-3-small-music-text-to-audio_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "stable-audio-3-small-music-text-to-audio",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/stable-audio-3-small-music-text-to-audio_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "stable-audio-3-small-music-text-to-audio_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "stable-audio-3-small-music-text-to-audio",
  "error": null,
  "output": {
    "media_url": ["https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/stable-audio-3-small-music-text-to-audio_019dxxxx/output.mp3"],
    "media_type": "audio/mpeg"
  },
  "created_at": "2026-03-31T10:00:00.000Z",
  "updated_at": "2026-03-31T10:00:15.000Z",
  "completed_at": "2026-03-31T10:00:15.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Stable Audio 3 API Pricing

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