# Wan-2.1 First-Last-Frame-to-Video API

> Gineadair bhidio Wan 2.1 a bheothaicheas eadar ciad ìomhaigh agus ìomhaigh dheireannach a chaidh a thoirt seachad

Cruthaichidh e criomag a ghluaiseas bho `start_image_url` gu `end_image_url`, air a stiùireadh le `prompt`. Tha an rùn 480p no 720p, agus an co-mheas taobh auto, 16:9, 9:16 no 1:1. Tha `num_frames` 81-100 agus `frames_per_second` 5-24. Tha taic ann do `negative_prompt`, `seed`, smachdan stiùiridh agus cheumannan, agus cuideaman LoRA tro `loras`.

- Model id: `wan-flf2v`
- Made by: Alibaba
- Category: Image to Video
- Output: video
- Price: from $0.20 / video (cheapest run $0.20 (200 API credits))
- Run: `POST https://api.doitong.com/v1/run/wan-flf2v`
- Quote: `POST https://api.doitong.com/v1/quote/wan-flf2v`
- Docs page: https://doitong.com/gd/developers/models/wan-flf2v

## Pricing

Price: **from $0.20 / video** (the lowest tier; the quote prices your exact input). Billed once per generated video.

Price rules (the first rule that matches the input wins; a parameter you leave out counts as its default):

- When `num_frames` > 81 and `resolution` = 720p: $0.50 (500 API credits) / video
- When `resolution` = 720p: $0.40 (400 API credits) / video
- When `num_frames` > 81: $0.25 (250 API credits) / video

The full example input below costs $0.40 = 400 API credits (1 video × 400 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/wan-flf2v` 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 |  |  | Stiùiridhean teacsa a stiùireas gineadh bhidio. |
| `negative_prompt` |  | string | no | `bright colors, overexposed, static, blurred details, subtitles, style, artwork, painting, picture, still, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, malformed limbs, fused fingers, still picture, cluttered background, three legs, many people in the background, walking backwards` |  | Prompt àicheil a thèid a chur an sàs nuair a thathar a’ gineadh bhidio. |
| `start_image_url` | `image` | string (image URL) | yes |  |  | Thoir seachad an ìomhaigh tòiseachaidh tro URL; gus an co-mheas taobh taghte a cho-mhaidseadh, thèid ath-mheudachadh agus bearradh timcheall an ionaid a dhèanamh nuair a bhios co-mheas na h-ìomhaighe eadar-dhealaichte. |
| `end_image_url` | `end_image` | string (image URL) | yes |  |  | Thoir seachad an ìomhaigh chrìochnaich tro URL; gus an co-mheas taobh taghte a cho-mhaidseadh, thèid ath-mheudachadh agus bearradh timcheall an ionaid a dhèanamh nuair a bhios co-mheas na h-ìomhaighe eadar-dhealaichte. |
| `num_frames` |  | integer \| null | no | `81` | 81 – 100 | Àireamh nam frèaman airson gineadh, bho 81 gu 100, an dà cheann nam measg. |
| `frames_per_second` |  | integer \| null | no | `16` | 5 – 24 | Ìre frèamaichean a’ bhidio a chaidh a ghineadh, ann am frèamaichean gach diog, bho 5 gu 24. |
| `seed` |  | integer \| null | no |  |  | Sìol a nì gineadh ath-riochdachail. Le bhith ga shuidheachadh gu None, thèid sìol a thaghadh air thuaiream. |
| `resolution` |  | enum (string) | no | `720p` | `480p`, `720p` | Dùmhlachd-bhreacaidh bhidio an às-chuir, an dara cuid 480p no 720p. |
| `num_inference_steps` |  | integer | no | `30` | 2 – 40 | Cunntas cheumannan samplachaidh, ag iomlaid ùine giullachd nas fhaide airson càileachd nas fheàrr mar a bhios an cunntas ag èirigh. |
| `guide_scale` |  | number | no | `5` | 1 – 10 | Neart stiùiridh gun chlasadair, ag iomlaid call càileachd a dh’fhaodadh tachairt airson maidseadh nas dlùithe ris a’ phrompt mar a bhios an sgèile ag èirigh. |
| `shift` |  | number | no | `5` | 1 – 10 | Suidheachadh shift a thèid a chur an sàs nuair a thathar a’ gineadh bhidio. |
| `enable_safety_checker` |  | boolean | no | `false` |  | Tionndadh sgrùdaidh sàbhailteachd agus feumaidh a shuidheachadh dheth ùghdarras cunntais. Gun an ùghdarras sin, thèid gach iarrtas a sgrùdadh ge bith dè an suidheachadh; tha true a’ cur an sgrùdaiche an comas. |
| `enable_prompt_expansion` |  | boolean | no | `false` |  | Smachd air a bheil leudachadh a’ phrompt air a chomasachadh. |
| `acceleration` |  | enum (string) | no | `regular` | `none`, `regular` | Suidheachadh luathachaidh, le 'regular' mar an roghainn a thathar a’ moladh. Bidh àrdachadh luathachaidh ag ìobairt càileachd gus ùine gineadh a ghiorrachadh. |
| `aspect_ratio` |  | enum (string) | no | `auto` | `auto`, `16:9`, `9:16`, `1:1` | Co-mheasan a’ bhidio a chaidh a ghineadh, air an taghadh gu fèin-obrachail bhon ìomhaigh in-chuir nuair a tha iad air an suidheachadh gu 'auto'. |
| `loras` |  | array of object {path, weight_name, scale} | no | `[]` |  | Cuideaman LoRA a chuirear an sàs rè co-dhùnaidh. |
| `loras[].path` |  | string | yes |  |  | Àite cuideaman an LoRA, air a shònrachadh mar URL no slighe. |
| `loras[].weight_name` |  | string \| null | no |  |  | Ainm cuideim LoRA, riatanach dìreach nuair a tha barrachd air 1 fhaidhle safetensors ann an stòras Hugging Face. Cha chleachdar an t-ainm seo ach nuair a chomharraicheas `path` stòras mar sin. |
| `loras[].scale` |  | number | no | `1` | 0 – 4 | Iomadadair a thèid a chur air cuideam an LoRA mus tèid a cho-aonadh ris a’ mhodail bhunaiteach. |

File parameters (`image`, `end_image`) 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",
  "end_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",
  "start_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
  "end_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/wan-flf2v?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",
    "start_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_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/wan-flf2v?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",
    "start_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_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",
    "start_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_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/wan-flf2v", 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": "wan-flf2v",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "start_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
        "end_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": "wan-flf2v",
  "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": 400,
    "usd": "0.40",
    "charged": 400,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "start_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    "end_image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  },
  "output": {
    "video": {
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_name": "0-output.mp4",
      "file_size": 1843200
    },
    "seed": 42
  },
  "outputs": [
    {
      "type": "video",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.mp4",
      "content_type": "video/mp4",
      "file_size": 1843200,
      "width": 1280,
      "height": 720,
      "duration": 5,
      "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} | Faidhle bhidio a chaidh a chruthachadh le gineadh. |
| `seed` | integer | Luach sìl a chaidh a chur an sàs rè gineadh. |

## Related models

- [Wan-2.1 Pro Text-to-Video](https://doitong.com/developers/models/wan-pro/text-to-video.md) (`wan-pro/text-to-video`): $0.80 / run
- [Wan-2.1 Text-to-Video](https://doitong.com/developers/models/wan-t2v.md) (`wan-t2v`): from $0.20 / video
- [Wan Effects](https://doitong.com/developers/models/wan-effects.md) (`wan-effects`): $0.35 / video
- [Wan-2.1 Image-to-Video](https://doitong.com/developers/models/wan-i2v.md) (`wan-i2v`): from $0.20 / video
- [Wan-2.1 Pro Image-to-Video](https://doitong.com/developers/models/wan-pro/image-to-video.md) (`wan-pro/image-to-video`): $0.80 / video
- [Wan 3.0 Image to Video](https://doitong.com/developers/models/alibaba/wan-3.0/image-to-video.md) (`alibaba/wan-3.0/image-to-video`): from $0.05 / second
- [FLUX 3 Max Image to Video](https://doitong.com/developers/models/blackforestlabs/flux-3-max/image-to-video.md) (`blackforestlabs/flux-3-max/image-to-video`): from $0.0425 / second of output video
- [Grok Imagine Video 1.5 Image to Video](https://doitong.com/developers/models/xai/grok-imagine-video/v1.5/image-to-video.md) (`xai/grok-imagine-video/v1.5/image-to-video`): from $0.082 / second

## Links

- HTML page: https://doitong.com/developers/models/wan-flf2v
- 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=wan-flf2v
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/wan-flf2v