# Stable Audio 3 Medium Base Audio to Audio API

> Audio-to-audio רעמיקס מיט Medium באַזע־טשעקפּוינט: פֿאָרמירט אַ קוואַל־קליפּ לויט אַ פּראָמפּט, ביז 380 סעקונדעס

נעמט אַ מקור־קליפּ דורך `audio_url` פּלוס אַ טעקסט־`prompt` און שאַפֿט אַ פֿאַרוואַנדלטע ווערסיע. `init_noise_level` (0 ביז 1) באַשטימט ווי נאָענט דער רעזולטאַט גייט נאָך דער אַרײַנגעבונג, און `duration` נעמט אָן 1 ביז 380 סעקונדעס. דאָס איז דער ניט־דיסטילירטער טשעקפּוינט, דערפֿאַר זענען די סטאַנדאַרטן 50 סאַמפּלינג־שריט און אַ גיידאַנס־סקעיל פֿון 7. דער רעזולטאַט קען זײַן mp3, wav, flac, ogg, opus, m4a אָדער aac.

- Model id: `stable-audio-3/medium/base/audio-to-audio`
- Made by: Stability AI
- Category: Audio
- Output: audio
- Price: $0.0523 / request (cheapest run $0.053 (53 API credits))
- Run: `POST https://api.doitong.com/v1/run/stable-audio-3/medium/base/audio-to-audio`
- Quote: `POST https://api.doitong.com/v1/quote/stable-audio-3/medium/base/audio-to-audio`
- Docs page: https://doitong.com/yi/developers/models/stable-audio-3/medium/base/audio-to-audio

## Pricing

Price: **$0.0523 / request**. Billed once per request.

The full example input below costs $0.053 = 53 API credits (1 request × 52.3 API credits).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.com/v1/quote/stable-audio-3/medium/base/audio-to-audio` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `negative_prompt` |  | string | no | `` |  | טעקסט וואָס ספּעציפֿיצירט אומגעוואונטשענע אייגנשאַפֿטן אינעם רעזולטאַט. |
| `duration` |  | number | no | `30` | 1 – 380 | אַודיאָ־לענג אין סעקונדעס, מיט אַ מאַקסימום פון 380 סעקונדעס פֿאַרן medium־מאָדעל (בערך 6 מינוט 20 סעקונדעס). |
| `num_inference_steps` |  | integer | no | `50` | 1 – 100 | קלײַבט ווי פֿיל סאַמפּלינג־סטעפּס צו לויפֿן; בערך 50 גיט גוטע קוואַליטעט מיט באַזע־טשעקפּוינטן (נישט דיסטילירט). |
| `guidance_scale` |  | number | no | `7` | 0 – 25 | Classifier-free guidance־שטאַרקייט, פֿאַר וועלכער בערך 7.0 ווערט רעקאָמענדירט אָנהייבנדיק אויף באַזע־טשעקפּוינטן; דאָס הייבן מאַכט די גענערירונג זיך נאָענטער צו דעם פּראָמפּט. |
| `seed` |  | integer \| null | no |  |  | צופֿעליקער גענעראַטאָר־זוימען פֿאַר איבערחזרבאַרע רעזולטאַטן; ווען מען לאָזט אים אויס, ווערט אויסגעקליבן אַ צופֿעליקער זוימען. |
| `enable_prompt_expansion` |  | boolean | no | `false` |  | פּראָמפּט־פֿאַרברייטערונג מיט אַן LLM ווען אַקטיווירט, וואָס לייגט צו דעטאַלן און פֿאַרבעסערט די רעזולטאַט־קוואַליטעט. |
| `enable_safety_checker` |  | boolean | no | `true` |  | זיכערקייט־קאָנטראָל פֿאַר NSFW אינהאַלט. |
| `output_format` |  | enum (string) | no | `mp3` | `mp3`, `wav`, `flac`, `ogg`, `opus`, `m4a`, `aac` | קאַנטיינער־פֿאָרמאַט געניצט פֿאַרן רעזולטאַט־אַודיאָ. |
| `bitrate` |  | string | no | `192k` |  | ביטרייט פונעם רעזולטאַט־אַודיאָ, איגנאָרירט בײַ wav אָדער flac ווײַל זיי זענען לאָסלעס. פֿאַר קאָמפּרימירטע פֿאָרמאַטן ווי mp3, aac אָדער opus, צושטעלט אַ ווערט אין פֿאָרעם '192k' אָדער '320k'. |
| `prompt` |  | string | yes |  |  | טעקסט־אנווײַזונגען וואָס באַשרײַבן די טראַנספֿאָרמאַציע פֿאַרן קוואַל־אַודיאָ. |
| `audio_url` | `audio` | string (audio URL) | yes |  |  | אַרײַנגעבונג־אַודיאָ פֿאַר טראַנספֿאָרמאַציע. |
| `init_noise_level` |  | number | no | `0.9` | 0 – 1 | רעש־מדרגה פונעם קוואַל־אַודיאָ: 0.1 באַהאַלט נאָענטע ענלעכקייט צו דער אַרײַנגעבונג, 0.5 איז מיטל, און 1.0 פֿאַרבײַט דעם קוואַל גאָר מיט רעש פֿאַר ריינע גענערירונג. |

File parameters (`audio`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "audio": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.com/v1/run/stable-audio-3/medium/base/audio-to-audio?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.com/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.com/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/stable-audio-3/medium/base/audio-to-audio?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.com/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/stable-audio-3/medium/base/audio-to-audio", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.com/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "stable-audio-3/medium/base/audio-to-audio",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "stable-audio-3/medium/base/audio-to-audio",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 53,
    "usd": "0.053",
    "charged": 53,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "audio_url": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
  },
  "output": {
    "audio": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp3",
      "content_type": "audio/mpeg",
      "file_name": "0-output.mp3",
      "file_size": 1843200
    },
    "seed": 42,
    "prompt": "string"
  },
  "outputs": [
    {
      "type": "audio",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp3",
      "content_type": "audio/mpeg",
      "file_size": 1843200,
      "duration": 12,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `audio` | object {url, content_type, file_name, file_size} | אַודיאָ־קליפּ געשאַפֿן דורך גענערירונג. |
| `seed` | integer | זוימען וואָס האָט קאַנטראָלירט צופֿעליקייט בעת גענערירונג. |
| `prompt` | string | פּראָמפּט וואָס איז געניצט געוואָרן צו גענערירן דעם רעזולטאַט. |

## Related models

- [Stable Audio 3 Small Music Audio Inpainting](https://doitong.com/developers/models/stable-audio-3/small/music/audio-inpainting.md) (`stable-audio-3/small/music/audio-inpainting`): $0.026 / request
- [Stable Audio 3 Small Music Audio Outpainting](https://doitong.com/developers/models/stable-audio-3/small/music/audio-outpainting.md) (`stable-audio-3/small/music/audio-outpainting`): $0.0265 / request
- [Stable Audio 3 Small Music Base Audio Inpainting](https://doitong.com/developers/models/stable-audio-3/small/music/base/audio-inpainting.md) (`stable-audio-3/small/music/base/audio-inpainting`): $0.0333 / request
- [Stable Audio 3 Small Music Base Audio Outpainting](https://doitong.com/developers/models/stable-audio-3/small/music/base/audio-outpainting.md) (`stable-audio-3/small/music/base/audio-outpainting`): $0.0339 / request
- [Stable Audio 3 Small Music Base Audio to Audio](https://doitong.com/developers/models/stable-audio-3/small/music/base/audio-to-audio.md) (`stable-audio-3/small/music/base/audio-to-audio`): $0.032 / request
- [Stable Audio 3 Small Music Text to Audio](https://doitong.com/developers/models/stable-audio-3/small/music/text-to-audio.md) (`stable-audio-3/small/music/text-to-audio`): $0.0217 / request
- [Stable Audio 3 · Small · Music · Audio to Audio](https://doitong.com/developers/models/stable-audio-3/small/music/audio-to-audio.md) (`stable-audio-3/small/music/audio-to-audio`): $0.0248 / request
- [Stable Audio 3 · Small · Music · Base · Text to Audio](https://doitong.com/developers/models/stable-audio-3/small/music/base/text-to-audio.md) (`stable-audio-3/small/music/base/text-to-audio`): $0.0281 / request

## Links

- HTML page: https://doitong.com/developers/models/stable-audio-3/medium/base/audio-to-audio
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=stable-audio-3/medium/base/audio-to-audio
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/stable-audio-3/medium/base/audio-to-audio