# ACE Step Audio Inpaint API

> ᠵᠠᠯᡳᠨᠠᠮᠪᡳ ᡳᠰᡥᠠᠨ ᠠᠮᠪᠠᠨ ᡤᡝᠯᡳ ᡳ ᠰᡝᠮᠪᡝ ᠵᠠᠩᡤᡳ ᠨᡝᠸᡝ ᡨᠠᡤᡤᠠ ᠪᡝ ᠰᡠᠯᡳᠩᡤᠠ ᡳ ᠠᠮᠠᡤᠠ ᠰᡠᠯᡳᠩᡤᠠ ᡥᡝᠯᡝᠨ ᡩᡝ ᠠᠮᠪᡠᠯᠠᠮᠪᡳ

`audio_url` ᠪᡝ ᠠᠰᡥᠠᠮᠪᡳ, `start_time` ᠮᡠᠰᡝ ᡳ ᠵᠠᠯᡳᠨᠠᠮᠪᡳ ᡳ ᠵᠠᠯᡳᠨᠠᠮᠪᡳ ᡩᡝᡵᡝ `end_time` ᡳ ᠵᠠᠯᡳᠨᡳ ᠠᠮᠠᡤᠠ ᠰᡝᠮᠪᡝ ᠪᡳᠰᡳᡵᡝᠨ ᡩᡝ ᠰᠣᠯᠪᡠᠮᠪᡳ, ᠠᠨᡳᠶᠠ 0 ᡩᡝ 240 ᠰᡝᡴᡠᠨ. ᠮᡠᠰᡝ ᡳ ᠵᠠᠯᡳᠨ ᠵᠠᠯᡠ ᠪᠣᠶᠣ ᡩᡝᡵᡝ ᠵᠠᠯᡠ ᡩᡝ ᠠᠰᡥᠠᠮᠪᡳ. ᠰᡠᠯᡳᠩᡤᠠ `tags` ᠮᡠᠰᡝ ᡳ `lyrics` ᠰᡝᠮᠪᡝ ᠵᠠᠯᡳᠨᠠᠮᠪᡳ, `variance` ᠵᠠᠯᡳᠨᠠᠮᠪᡝ ᠠᠮᠠᡤᠠ ᠪᡝ ᠪᠠᡳᠮᠪᡳ. ᠵᠠᠯᡳᠨᠠᠮᠪᡝᠴᡳ ᠠᠮᠠᠯᠠ ᠠᠮᠪᠠᠨ ᠵᠠᠯᡳᠨ ᡳ ᠠᠰᡥᠠᠮᠪᡳ.

- Model id: `ace-step/audio-inpaint`
- Made by: ACE Studio
- Category: Text to Music
- Output: audio
- Price per second of your input audio: $0.0002 / second of input audio (cheapest run $0.001 (1 API credit))
- Run: `POST https://api.doitong.com/v1/run/ace-step/audio-inpaint`
- Quote: `POST https://api.doitong.com/v1/quote/ace-step/audio-inpaint`
- Docs page: https://doitong.com/mnc/developers/models/ace-step/audio-inpaint

## Pricing

Price: **$0.0002 / second of input audio**. Price per second of your input audio: the input files are measured before the run (length, resolution, frame rate). The quote measures the same files and is exactly what the run charges.

The full example input below costs $0.002 = 2 API credits (10 s input audio × $0.0002).

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/ace-step/audio-inpaint` 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 |
|---|---|---|---|---|---|---|
| `audio_url` | `audio` | string (audio URL) | yes |  |  | ᡳᠨᡤᠠᡳᠨᡳᠨᡤᡝ ᡤᡳᠰᡠᠨ ᡳ ᡶᡳᠯᡝ URL᠉ |
| `start_time_relative_to` |  | enum (string) | no | `start` | `start`, `end` | ᡝᠨᡝ ᡳᠨᡳ ᡩᡝᡵᡤᡳ ᠵᡠᠰᡝ ᡳ ᡝᡵᡝᠮᡝ ᠪᡠᠮᡝ ᠪᠠ ᠶᠠᠰᡠᡴᠠᠨ ᡳ ᡝᠵᡝᠨ᠉ |
| `start_time` |  | number | no | `0` | 0 – 240 | ᡳᠨᡤᠠᡳᠨᡳᠨᠠᠮᡝ ᠵᡠᡴᡴᠠᠨ ᡳ ᡝᡵᡝᠮᡝ ᠪᡠᠮᡝ᠈ ᡝᠨᡝ ᡩᡝ ᠰᡝᡴᡠᠨᡩ ᠵᠠᠯᠠᠨ᠉ |
| `end_time_relative_to` |  | enum (string) | no | `start` | `start`, `end` | ᠵᡠᠰᡝ ᡳ ᠵᡠᠰᡝ ᡩᡝ ᠠᠰᡠᡵᠠᠮᡝ ᠪᡳᠮᡝ ᠵᡠᠴᡝᠨ᠈ ᠵᡠᡴᡴᠠᠨ ᡳ ᡝᡵᡝᠮᡝ ᠪᡠᠮᡝ ᠪᠠ ᡳᠨᡳ ᠶᠠᠰᡠᡴᠠᠨ ᡳ ᡝᠵᡝᠨ᠉ |
| `end_time` |  | number | no | `30` | 0 – 240 | ᡳᠨᡤᠠᡳᠨᡳᠨᠠᠮᡝ ᠵᡠᠰᡝ ᡳ ᡝᠵᡝᠨ᠈ ᡝᠨᡝ ᡩᡝ ᠰᡝᡴᡠᠨᡩ ᠵᠠᠯᠠᠨ᠉ |
| `tags` |  | string | yes |  |  | ᡤᡳᠰᡠᠨ ᡳ ᠵᡠᡩᠠᠨ ᡤᡝᠨᡝᡵᡝᠰᡳ ᠵᠠᡵᡤᠠᠨ ᠵᠠᡯᡳᠨ ᠪᠠᡳᡥᠠᠨᠠᠮᡝ ᡶᠠᠰᡠᡵᡝᠪᡠᡥᡝ᠈ `prompt` ᡝᡵᡝᠰᡳ ᡳᠨᡠ ᡝᡵᡝᠮᡝ ᠪᡠᠮᡝ ᡠᠨᡩᡝᠩᡤᡝᠨ ᠪᡠᠮᡝ ᠰᠠᡳᠨ ᠪᡳᠰᡳᡵᡝᠩᡤᡝ᠉ |
| `lyrics` |  | string | no | `` |  | ᠵᠠᠯᠠᠨ ᡩᡝ ᡤᡳᠰᡠᠨ ᠵᡠᡴᡴᠠᠨᠠᠮᡝ ᡤᡡᠨᡳᠨ ᡠᠨᡩᡝᠩᡤᡝᠨ᠈ [verse]᠈ [chorus] ᠪᠠ [bridge] ᡩᡝ ᠵᡠᡴᡴᠠᠨ ᡤᡳᠰᡠᠨ ᡳ ᡠᠯᡥᠠᠨ ᠪᡳᡥᠠᠨᠠᠮᡝ ᠵᡠᡴᡴᠠᠨᠠᠮᡝ᠉ ᡤᡳᠰᡠᠨ ᡩᡝ ᡠᠯᡥᠠᠨ ᡳᠨᡠ ᠪᡳᠰᡳᠨᡝ᠈ ᡝᡵᡝᠮᡝ ᠪᡠᠮᡝ ᠪᡠᡵᡠᠨᡩᡝ [inst] ᠠᠶᠠᠨ [instrumental] ᠪᡠᠮᡝ ᠣᠮᠣᠰᡳᠯᠠᠮᡝ᠉ |
| `variance` |  | number | no | `0.5` | 0 – 1 | ᡳᠨᡤᠠᡳᠨᡳᠨᠠᠮᡝ ᠵᠠᠯᠠᠨ ᡳ ᠰᡠᠯᠠᠮᡝ ᠠᠰᡠᡵᠠᠮᡝ᠈ ᠵᠠᠯᠠᠨ ᠠᠮᡤᠠᠨ ᠣᠯᡥᠣᠪᡠᠮᡝ᠉ |
| `number_of_steps` |  | integer | no | `27` | 3 – 60 | ᡤᡳᠰᡠᠨ ᡳ ᠪᡠᠶᡝᠮᡝ ᡳ ᡩᡠᠯᠠᠨ ᠠᠯᡳᠨ᠈ ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠠᠰᡠᠷᠠᠮᡝ᠉ |
| `seed` |  | integer \| null | no |  |  | ᠪᡠᠶᡝᠮᡝ ᡳᠨᡠ ᠣᠯᠣᡥᠣ ᠪᡠᠮᡝ ᠪᠠᠨᠵᡳᠨᠠᠮᡝ ᡴᡳᠮᡝ ᠰᠠᡳᠨ ᠪᡳᠰᡳᠨᡝ᠉ |
| `scheduler` |  | enum (string) | no | `euler` | `euler`, `heun` | ᠪᡠᠶᡝᠮᡝ ᡳ ᡩᡝ ᠠᠰᡠᠷᠠᠮᡝ ᠪᡳᠮᡝ ᠵᠠᠯᠠᠨ᠉ |
| `guidance_type` |  | enum (string) | no | `apg` | `cfg`, `apg`, `cfg_star` | ᠪᡠᠶᡝᠮᡝ ᡳ ᠠᠰᡠᠷᠠᠮᡝ ᠪᡠᠷᡠᠨᡳ CFG ᠶᠠᠪᡠᡥᠠᠨ᠉ |
| `granularity_scale` |  | integer | no | `10` | -100 – 100 | ᠪᡠᠶᡝᠮᡝ ᡳ ᠨᠠᠷᡥᡡᠨ ᠶᠠᠪᡠᡥᠠᠨ᠈ ᠵᠠᠯᠠᠨ ᠠᠰᡠᡵᠠᠮᡝ ᡩᡝ ᠠᠮᡤᠠᠨ ᠣᠯᡥᠣᠪᡠᠮᡝ᠉ |
| `guidance_interval` |  | number | no | `0.5` | 0 – 1 | ᠪᡠᠶᡝᠮᡝ ᡳ ᠶᠠᠪᡠᡥᠠᠨ ᡳ ᠵᡠᠰᡝ ᠠᠰᡠᡵᠠᠮᡝ ᠣᠯᡥᠣᠪᡠᠮᡝ᠈ 0.5 ᡩᡝ 0.25 * infer_steps ᡩᡝ 0.75 * infer_steps ᠴᡳ ᠠᠨᡩᠠ ᠠᠰᡠᡵᠠᠮᡝ ᠣᠯᡥᠣᠪᡠᠮᡝ᠈ ᡳᠨᡳ ᡤᡳᠰᡠᠨ ᠵᡠᠰᡝ ᠠᠰᡠᡵᠠᠮᡝ ᠠᡴᡡ᠉ |
| `guidance_interval_decay` |  | number | no | `0` | 0 – 1 | ᠪᡠᠶᡝᠮᡝ ᡳ ᠵᠠᠯᠠᠨ ᠵᡠᠰᡝ ᠳᡝ ᠠᠰᡠᡵᠠᠮᡝ ᡳ ᠰᡠᠯᠠᠮᡝ᠈ 0.0 ᠴᡳ ᠰᡠᠯᠠᠮᡝ ᠠᡴᡡ᠈ ᠠᠮᡤᠠᠨ ᠪᡳᠴᡳ᠈ guidance_scale ᠴᡳ min_guidance_scale ᠵᠠᠯᠠᠨ ᠵᡠᠰᡝ ᡩᡝ ᠣᠯᡥᠣᠪᡠᠮᡝ᠉ |
| `guidance_scale` |  | number | no | `15` | 0 – 200 | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠠᠰᡠᡵᠠᠮᡝ ᡳ ᠵᠠᠯᠠᠨ᠉ |
| `minimum_guidance_scale` |  | number | no | `3` | 0 – 200 | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠰᡠᠯᠠᠮᡝ ᠵᡠᠰᡝ ᠣᠯᡥᠣᠮᡝ ᠵᠠᠯᠠᠨ᠉ |
| `tag_guidance_scale` |  | number | no | `5` | 0 – 10 | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠵᠠᡯᡳᠨ ᡳ ᠠᠰᡠᡵᠠᠮᡝ ᡳ ᠵᠠᠯᠠᠨ᠉ |
| `lyric_guidance_scale` |  | number | no | `1.5` | 0 – 10 | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠠᠰᡠᡵᠠᠮᡝ ᡳ ᠵᡠᡴᡴᠠᠨ ᡤᡳᠰᡠᠨ ᡳ ᠵᠠᠯᠠᠨ᠉ |

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
{
  "tags": "lofi, hiphop, drum and bass, trap, chill",
  "audio": "https://content.doitong.com/audio/showcase/v3/tools/dub_es.mp3"
}
```

A fuller example:

```json
{
  "tags": "lofi, hiphop, drum and bass, trap, chill",
  "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/ace-step/audio-inpaint?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "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/ace-step/audio-inpaint?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "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 = {
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "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/ace-step/audio-inpaint", 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": "ace-step/audio-inpaint",
      "input": {
        "tags": "lofi, hiphop, drum and bass, trap, chill",
        "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": "ace-step/audio-inpaint",
  "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": 2,
    "usd": "0.002",
    "charged": 2,
    "refunded": 0
  },
  "input": {
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "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,
    "tags": "lofi, hiphop, drum and bass, trap, chill",
    "lyrics": "[inst]"
  },
  "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} | ᠪᡠᠶᡝᠮᡝ ᠵᡠᡴᡴᠠᠨ ᡤᡳᠰᡠᠨ ᡳ ᡶᡳᠯᡝ᠉ |
| `seed` | integer | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠣᠯᡥᠣᡥᠣ ᠪᠠᠨᠵᡳᠨᠠᠮᡝ᠉ |
| `tags` | string | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠶᠠᠪᡠᡥᠠᠨ ᠵᠠᡯᡳᠨ ᡳ ᡶᠠᠰᡠᡵᡝᠪᡠᡥᡝ᠉ |
| `lyrics` | string | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠶᠠᠪᡠᡥᠠᠨ ᡥᡡᠯᠠᠨ᠉ |

## Related models

- [ACE Step](https://doitong.com/developers/models/ace-step.md) (`ace-step`): $0.0002 / second
- [ACE Step Audio Outpaint](https://doitong.com/developers/models/ace-step/audio-outpaint.md) (`ace-step/audio-outpaint`): $0.0002 / second of output audio
- [ACE Step Audio To Audio](https://doitong.com/developers/models/ace-step/audio-to-audio.md) (`ace-step/audio-to-audio`): $0.0002 / second of input audio
- [ACE Step Prompt To Audio](https://doitong.com/developers/models/ace-step/prompt-to-audio.md) (`ace-step/prompt-to-audio`): $0.0002 / second
- [MiniMax Music 3](https://doitong.com/developers/models/minimax/music-3.md) (`minimax/music-3`): $0.002 / second
- [DiffRhythm: Lyrics to Song](https://doitong.com/developers/models/diffrhythm.md) (`diffrhythm`): $0.001 / second
- [Elevenlabs Music](https://doitong.com/developers/models/elevenlabs/music.md) (`elevenlabs/music`): $0.60 / minute of output audio
- [Elevenlabs Music v2](https://doitong.com/developers/models/elevenlabs/music/v2.md) (`elevenlabs/music/v2`): $0.60 / minute of output audio

## Links

- HTML page: https://doitong.com/developers/models/ace-step/audio-inpaint
- 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=ace-step/audio-inpaint
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/ace-step/audio-inpaint