# LTX 2.3 Trainer (V2) - Keyframe Interpolation API

> Oahpaha LoRA:a mii ráhkada lihkadusa vuosttaš ja maŋimus váldorámma gaskkas, eará gaskarámain dáhttu

Oahpaha LoRA:a váldorámma-interpolerenii: inferenssas addát vuosttaš ja maŋimus ráma, ja modela ráhkada gaskkasklippa. Aktivisere `include_middle_keyframe` oahpahan dihte vuosttaš-, gaskka- ja maŋimus rámain; dalle ferte juohke valideren-sample addit `middle_image_url`. Data boahtá zipa bokte `training_data_url` čađa, gitta 2 validerenoggosaiguin.

- Model id: `ltx23-trainer-v2/interpolate`
- Made by: Lightricks
- Category: Training
- Output: file
- Price: $0.0024 / step (cheapest run $4.80 (4800 API credits))
- Run: `POST https://api.doitong.com/v1/run/ltx23-trainer-v2/interpolate`
- Quote: `POST https://api.doitong.com/v1/quote/ltx23-trainer-v2/interpolate`
- Docs page: https://doitong.com/se/developers/models/ltx23-trainer-v2/interpolate

## Pricing

Price: **$0.0024 / step**. Billed per training step (`number_of_steps`).

The full example input below costs $4.80 = 4800 API credits (2000 steps × 2.4 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/ltx23-trainer-v2/interpolate` 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

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `training_data_url` |  | string | yes |  |  | URL mii sisttisdoallá `.zip`-fiilla oahpahusdataiguin, válljejuvvon oahpahusmodusa mielde organiseret. Juohke media-fiillas sáhttá leat seammá vuođđonama `.txt`-govvádus. |
| `rank` |  | enum (integer) | no | `32` | `8`, `16`, `32`, `64`, `128` | LoRA-heivehusa ranka, mas alit heivehus lasiha muittut geavaheami muhto maiddái kapasitehta. |
| `number_of_steps` |  | integer | no | `2000` | 100 – 10,000 | Oahpahus-ceahkiid oppalaš lohku. |
| `learning_rate` |  | number | no | `0.0002` | 0.000001 – 1 | Optimisašuvnna oahpahanjohtolat. |
| `number_of_frames` |  | integer | no | `89` | 9 – 121 | Rámmaid lohku juohke oahpahussámpalis. Lohku juogaduvvon 8:ain galgá guođđit 1:a; ovdamearkkat leat 1, 9, 17, 25, 33, 41, 49, 57, 65, 73, 81, 89, 97. |
| `frame_rate` |  | integer | no | `24` | 8 – 60 | Oahpahus-video ulbmil-rámmajohtolat rámman sekunddaš. LTX-2.3:a luonddujohtolat lea 24. |
| `resolution` |  | enum (string) | no | `medium` | `low`, `medium`, `high` | Oahpahus-resolušuvdna. Resolušuvnna lokten lasiha muittu dárbbu. |
| `aspect_ratio` |  | enum (string) | no | `1:1` | `16:9`, `1:1`, `9:16` | Oahpahus-aspektarátio. |
| `trigger_phrase` |  | string | no | `` |  | LoRA-stálja aktiviserenfrása, mii lasihuvvo govvádusaid álggahussii oahpahusa áigge. |
| `auto_scale_input` |  | boolean | no | `false` |  | Automáhtalaš video-heivehus bivdojuvvon FPS:a ja rámma-logu mielde go lea jođus; govvadatasetat báhcet rievdatkeahttá. |
| `split_input_into_scenes` |  | boolean | no | `true` |  | Videoid čuohkadeapmi go guhkkodat rádjejuvvon áiggi manná badjel, ja dat lea jođus go árvu lea true. |
| `split_input_duration_threshold` |  | number | no | `30` | 1 – 60 | Čuohkadeami álggaheaddji, meroštallojuvvon guhkkodahkan sekunddain: dušše videovat mat leat guhkit go ráddjejuvvon áigi čuohkaduvvojit. |
| `debug_dataset` |  | boolean | no | `false` |  | Ovdamearkka inspešuvdna-modus videoid, govaid ja govvádusaid dárkkisteapmái ovdal olles oahpahusa. Go dat lea jođus, oahpaheaddji máhcaha proseassaduvvon oahpahusdáhtaset arkivvan man sáhttá viežžat ja dárkkistit gieđain. |
| `validation` |  | array of object {prompt, start_image_url, end_image_url, middle_image_url} | no | `[]` | ≤ 2 items | Valideren-sisa-addi listun; merkoš čatná keyframe-govaid bivddaga. |
| `validation[].prompt` |  | string | yes |  |  | Bivdda mii geavahuvvo validerenis. |
| `validation[].start_image_url` |  | string (image URL) | yes |  | ≥ 1 characters | Keyframe-govva URL álggahusrámma várás. |
| `validation[].end_image_url` |  | string (image URL) | yes |  | ≥ 1 characters | Keyframe-govva URL loahpparámma várás. |
| `validation[].middle_image_url` |  | string (image URL) \| null | no |  |  | Gaskarámma-govva URL first+middle+last-interpoleremii. Runs with `include_middle_keyframe=true` gáibidit dan; muđui lea lassi molssaeaktu. |
| `validation_negative_prompt` |  | string | no | `blurry, out of focus, overexposed, underexposed, low contrast, washed out colors, excessive noise, grainy texture, poor lighting, flickering, motion blur, distorted proportions, unnatural skin tones, deformed facial features, asymmetrical face, missing facial features, extra limbs, disfigured hands, wrong hand count, artifacts around text, inconsistent perspective, camera shake, incorrect depth of field, background too sharp, background clutter, distracting reflections, harsh shadows, inconsistent lighting direction, color banding, cartoonish rendering, 3D CGI look, unrealistic materials, uncanny valley effect, incorrect ethnicity, wrong gender, exaggerated expressions, wrong gaze direction, mismatched lip sync, silent or muted audio, distorted voice, robotic voice, echo, background noise, off-sync audio, incorrect dialogue, added dialogue, repetitive speech, jittery movement, awkward pauses, incorrect timing, unnatural transitions, inconsistent framing, tilted camera, flat lighting, inconsistent tone, cinematic oversaturation, stylized filters, or AI artifacts.` |  | Negatiivvalaš bivdda validerenis, mii geavaha ovtta-muttu ovdančájehanproseassa. Dát proseassa sullii laktá distilled-ráhkadeami guokte-muttu inferenssii, danne rávvagat ja ovdančájehankvalitehta leat earáláganat loahpalaš bohtosiin. |
| `validation_number_of_frames` |  | integer | no | `89` | 9 – 121 | Rámmaid lohku juohke valideren-videoi. |
| `validation_frame_rate` |  | integer | no | `24` | 8 – 60 | Valideren-videoid ulbmil-rámmajohtolat rámman sekunddaš; LTX-2.3:a luonddujohtolat lea 24. |
| `validation_resolution` |  | enum (string) | no | `high` | `low`, `medium`, `high` | Validerenis geavahuvvon resolušuvdna. |
| `validation_aspect_ratio` |  | enum (string) | no | `1:1` | `16:9`, `1:1`, `9:16` | Validerenis geavahuvvon aspektarátio. |
| `stg_scale` |  | number | no | `1` | 0 – 3 | Spatio-Temporal Guidance (STG) skála, 1.0 lea ávkkálaš ja 0.0 časkkáda STG:a. |
| `include_middle_keyframe` |  | boolean | no | `false` |  | Gaskarámma mieldeátnin video-ráhkadeamis: true gáibida `middle_image_url` juohke validation-sámpalis ja seailluhá gaskarámma vuosttas ja maŋimus rámma lassin, iige geavat dušše vuosttas ja maŋimus. |

## Example input

Required parameters only:

```json
{
  "training_data_url": "https://example.com/your-file.zip"
}
```

A fuller example:

```json
{
  "training_data_url": "https://example.com/your-file.zip"
}
```

## 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/ltx23-trainer-v2/interpolate?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "training_data_url": "https://example.com/your-file.zip"
  }'

# 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/ltx23-trainer-v2/interpolate?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "training_data_url": "https://example.com/your-file.zip"
  }),
});
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 = {
    "training_data_url": "https://example.com/your-file.zip",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/ltx23-trainer-v2/interpolate", 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": "ltx23-trainer-v2/interpolate",
      "input": {
        "training_data_url": "https://example.com/your-file.zip"
      },
      "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": "ltx23-trainer-v2/interpolate",
  "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": 4800,
    "usd": "4.80",
    "charged": 4800,
    "refunded": 0
  },
  "input": {
    "training_data_url": "https://example.com/your-file.zip"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "audio": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "lora_file": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "config_file": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    },
    "debug_dataset": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_name": "0-output.jpeg",
      "file_size": 1843200
    }
  },
  "outputs": [
    {
      "type": "file",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_size": 1843200,
      "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 |
|---|---|---|
| `video` | object {url, content_type, file_name, file_size} \| null | Validerenis čohkkejuvvon video-ovdančájeheapmi, go olamuttus video-ráhkadeaddji loahppačuoggáide. |
| `audio` | object {url, content_type, file_name, file_size} \| null | Validerenis čohkkejuvvon jietna, mii addo ovdančájeheapmin go olamuttus dáidda jietna-dušše luottaide: /audio-inpaint, /audio-extend-suffix, /audio-extend-prefix, /t2a, /a2a, ja /v2a. |
| `lora_file` | object {url, content_type, file_name, file_size} | Oahpahuvvon LoRA-veagaid URL .safetensors-formáhtas. |
| `config_file` | object {url, content_type, file_name, file_size} | Heivehus inferensa-loahppačuoggá sajáiduhttimii. |
| `debug_dataset` | object {url, content_type, file_name, file_size} \| null | Dárkkistanboađus go `debug_dataset` lea jođus: arkiva man sáhttá viežžat ja mii sisttisdoallá oahpahusdáhta ovdamearkka proseassa maŋŋá. |

## Related models

- [LTX 2.3 Trainer (V2) - Audio Inpainting](https://doitong.com/developers/models/ltx23-trainer-v2/audio-inpaint.md) (`ltx23-trainer-v2/audio-inpaint`): $0.0023 / step
- [LTX 2.3 Trainer (V2) - Audio+Video Reference IC-LoRA](https://doitong.com/developers/models/ltx23-trainer-v2/ic-lora/av2av.md) (`ltx23-trainer-v2/ic-lora/av2av`): $0.0068 / step
- [LTX 2.3 Trainer (V2) - Audio+Video Reference Transformation](https://doitong.com/developers/models/ltx23-trainer-v2/av2av.md) (`ltx23-trainer-v2/av2av`): $0.0068 / step
- [LTX 2.3 Trainer (V2) - Audio-to-Audio](https://doitong.com/developers/models/ltx23-trainer-v2/a2a.md) (`ltx23-trainer-v2/a2a`): $0.0023 / step
- [LTX 2.3 Trainer (V2) - Audio-to-Audio IC-LoRA](https://doitong.com/developers/models/ltx23-trainer-v2/ic-lora/a2a.md) (`ltx23-trainer-v2/ic-lora/a2a`): $0.0023 / step
- [LTX 2.3 Trainer (V2) - Audio-to-Video](https://doitong.com/developers/models/ltx23-trainer-v2/a2v.md) (`ltx23-trainer-v2/a2v`): $0.006 / step
- [LTX 2.3 Trainer (V2) - Backward Audio Extension](https://doitong.com/developers/models/ltx23-trainer-v2/audio-extend-suffix.md) (`ltx23-trainer-v2/audio-extend-suffix`): $0.0023 / step
- [LTX 2.3 Trainer (V2) - Backward Video Extension](https://doitong.com/developers/models/ltx23-trainer-v2/extend-suffix.md) (`ltx23-trainer-v2/extend-suffix`): $0.0061 / step

## Links

- HTML page: https://doitong.com/developers/models/ltx23-trainer-v2/interpolate
- 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=ltx23-trainer-v2/interpolate
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/ltx23-trainer-v2/interpolate