# Optimized Latent Consistency (SDv1.5) API

> Billed-til-billede-transformation med få trin på Stable Diffusion 1.5 ved hjælp af latent konsistens og styrkekontrol

Ændrer stilen på eller modificerer et basisbillede ud fra en tekstprompt med en latent konsistenstilgang, der kun kræver få trin. `num_inference_steps` har standardværdien 4 og går op til 12. `strength` (0 til 1) angiver, hvor meget resultatet afviger fra inputtet, og der kan returneres op til 8 billeder pr. kald. En valgfri `mask_url`, `negative_prompt` og `seed` accepteres.

- Model id: `lcm-sd15-i2i`
- Made by: Open model
- Category: Image Editing
- Output: image
- Estimated price per run: $0.007 / image (cheapest run $0.007 (7 API credits))
- Run: `POST https://api.doitong.com/v1/run/lcm-sd15-i2i`
- Quote: `POST https://api.doitong.com/v1/quote/lcm-sd15-i2i`
- Docs page: https://doitong.com/da/developers/models/lcm-sd15-i2i

## Pricing

Price: **$0.007 / image**. Estimated from the typical cost of one run, per output (`num_images`). The quote is exactly what the run charges.

The full example input below costs $0.007 = 7 API credits (1 image × 7 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/lcm-sd15-i2i` 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 |
|---|---|---|---|---|---|---|
| `prompt` |  | string | yes |  |  | Beskriv det billede, du vil have genereret, med så mange detaljer som muligt for at opnå de bedste resultater. |
| `image_url` | `image` | string (image URL) | yes |  |  | Grundbillede til behandling. |
| `mask_url` | `mask` | string (image URL) \| null | no |  |  | URL til en maske, angivet af hensyn til generisk LCM-behandlingskompatibilitet. |
| `strength` |  | number | no | `0.8` | 0 – 1 | Indstilling for billedstyrke. |
| `negative_prompt` |  | string | no | `` |  | Negativ prompt, der angiver uønskede billeddetaljer. Den kan udelukke farver, objekter, sceneri eller finere træk og egenskaber såsom overskæg, sløring eller lav opløsning. |
| `seed` |  | integer \| null | no |  |  | Seed til genskabelse af billeder i Stable Diffusion. Et billede kan genskabes nøjagtigt ved hver kørsel ved at holde modelversion, prompt og seed uændrede. |
| `guidance_scale` |  | number | no | `1` | 0 – 16 | Styrke for prompt-overensstemmelse ved billedvalg, udtrykt som CFG (Classifier Free Guidance). |
| `num_inference_steps` |  | integer | no | `4` | 1 – 12 | Antal inferenstrin til billedgenerering, hvor større antal giver bedre billedkvalitet på bekostning af længere genereringstid. |
| `num_images` | `num_outputs` | integer | no | `1` | 1 – 8 | Størrelsen på den returnerede billedliste, genereret med en fælles prompt og negativ prompt, men en særskilt seed for hvert billede. |
| `enable_safety_checks` |  | boolean | no | `true` |  | Skift til sikkerhedskontrol af output, som kun godkendte konti må deaktivere; alle uautoriserede anmodninger kontrolleres uanset. Når værdien er true, screenes det resulterende billede for potentielt usikkert indhold, og et sort billede indsættes, hvis noget registreres. |
| `request_id` |  | string | no | `` |  | Identifikator for anmodningen til at knytte et svar til den anmodning, der frembragte det. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Screening kan lempes ved at angive false, hvis den kaldende part er autoriseret. |

File parameters (`image`, `mask`) 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",
  "image": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
}
```

A fuller example:

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

## 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/lcm-sd15-i2i?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",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }'

# 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/lcm-sd15-i2i?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",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }),
});
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",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/lcm-sd15-i2i", 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": "lcm-sd15-i2i",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
      },
      "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": "lcm-sd15-i2i",
  "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": 7,
    "usd": "0.007",
    "charged": 7,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  },
  "output": {
    "images": [
      {
        "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
        "width": 1024,
        "height": 768,
        "content_type": "image/jpeg"
      }
    ],
    "timings": {},
    "seed": 42,
    "num_inference_steps": 4,
    "request_id": "",
    "nsfw_content_detected": [
      false
    ]
  },
  "outputs": [
    {
      "type": "image",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_size": 1843200,
      "width": 1024,
      "height": 768,
      "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 |
|---|---|---|
| `images` | array of object {url, width, height, content_type} | Filoplysninger for de genererede billeder. |
| `timings` | object |  |
| `seed` | integer | Seed til billedgenerering, inklusive den tilfældigt valgte værdi, hvis inputtet ikke angav en seed; ellers gentages den angivne værdi. |
| `num_inference_steps` | integer | Fastlagt antal inferenstrin for billedgenerering, hentet fra inputtet, når det er angivet, og ellers fra standardværdien. |
| `request_id` | string | Identifikator for anmodningen til at knytte et svar til den anmodning, der frembragte det. |
| `nsfw_content_detected` | array of boolean | Sikkerhedsresultater pr. billede som en boolsk liste: hver post angiver potentielt usikkert indhold eller er false, når sikkerhedskontrol er deaktiveret. |

## Related models

- [FLUX.1 Kontext \[pro\]](https://doitong.com/developers/models/flux-pro/kontext.md) (`flux-pro/kontext`): $0.04 / image
- [GPT Image 2.5 Edit](https://doitong.com/developers/models/openai/gpt-image-2.5/flare/edit.md) (`openai/gpt-image-2.5/flare/edit`): from $0.12 / image
- [Nano Banana 2 Edit](https://doitong.com/developers/models/nano-banana-2/edit.md) (`nano-banana-2/edit`): from $0.06 / image
- [Nano Banana Pro Edit](https://doitong.com/developers/models/nano-banana-pro/edit.md) (`nano-banana-pro/edit`): from $0.15 / image
- [Qwen Image 3 Edit](https://doitong.com/developers/models/alibaba/qwen-image-3/edit.md) (`alibaba/qwen-image-3/edit`): from $0.04 / image
- [Seedream 5.0 Pro Edit](https://doitong.com/developers/models/bytedance/seedream/v5/pro/edit.md) (`bytedance/seedream/v5/pro/edit`): from $0.0675 / run of output image
- [Bernini-R Edit Image](https://doitong.com/developers/models/bernini-r/edit-image.md) (`bernini-r/edit-image`): $0.03 / megapixel of output image
- [Boogu Image · Edit](https://doitong.com/developers/models/boogu-image/edit.md) (`boogu-image/edit`): $0.08 / image

## Links

- HTML page: https://doitong.com/developers/models/lcm-sd15-i2i
- 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=lcm-sd15-i2i
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/lcm-sd15-i2i