# HappyHorse-1.1 API

> HappyHorse-1.1 — high-quality AI video generation.

- **Provider**: Alibaba
- **Model id**: `happyhorse-1-1-reference-to-video`
- **Modality**: video
- **Price**: 13.02–16.76 credits /sec

## Overview

HappyHorse-1.1 is called in two steps: create a generation task, then poll the task until the result is ready.

## Authentication

All requests require a Bearer Token in the request header:

```
Authorization: Bearer YOUR_API_KEY
```

## Create Task

`POST https://you.bot/api/v1/generate`

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| modelId | string | Yes | Model id: `happyhorse-1-1-reference-to-video` |
| input | object | Yes | Input parameters object (see below) |
| callbackUrl | string | No | https URL we POST the finished task to. Signed with `X-Webhook-Signature` once you create a webhook signing key in Dashboard → Settings |

### input object parameters

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| prompt | string | Yes | A description of the desired elements and visual style for the generated video. Input in any language is supported. The length is limited to 5,000 non-Chinese characters or 2,500 Chinese characters. Content exceeding this limit is automatically truncated. Image referencing: In the prompt, use "[Image 1]" and "[Image 2]" to refer to the corresponding reference image in the media array. The order must be consistent with the order in the media array. When using a reference, specify the object in the image, such as "the woman in a red qipao in [Image 1]". Max 5000 characters. (example: Slow cinematic push-in with gentle ambient motion, soft light gradually shifting, and subtle parallax that brings the scene quietly to life.) |
| reference_image | string[] | Yes | The URL of a reference image. Image requirements: 1. Formats: JPEG, JPG, PNG, WEBP. 2. Resolution: The shortest side must be at least 400 pixels. A clear image with a resolution of 720P or higher is recommended. Avoid using images that are too small, blurry, or overly compressed, as this can degrade the output quality. 3. Maximum file size: 20 MB. (image URL) |
| resolution | string | No | The resolution tier of the generated video. (options: 720p \| 1080p) (default: 1080p) |
| aspect_ratio | string | No | The aspect ratio of the generated video. (options: 16:9 \| 9:16 \| 3:4 \| 4:3 \| 4:5 \| 5:4 \| 1:1 \| 9:21 \| 21:9) (default: 16:9) |
| duration | number | No | The duration of the generated video, in seconds. Value range: An integer from 3 to 15. (range 3-15) (default: 5) |

### Request example

```json
{
  "modelId": "happyhorse-1-1-reference-to-video",
  "input": {
    "prompt": "Slow cinematic push-in with gentle ambient motion, soft light gradually shifting, and subtle parallax that brings the scene quietly to life.",
    "reference_image": [
      "https://you.bot/examples/grok-imagine-text-to-image.jpg"
    ],
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "duration": 5
  }
}
```

### Response example

```json
{
  "taskId": "281e5b0…f39b9",
  "creditsCharged": 65.38
}
```

## Query Task

`GET https://you.bot/api/v1/task/{taskId}?model=happyhorse-1-1-reference-to-video`

When `state` is `success`, the output is in `resultUrls`: `{ "state": "success", "resultUrls": [ ... ] }`. (Text models return inline in the create response.)

## Error Codes

| Code | Description |
|------|-------------|
| 200 | Request successful |
| 400 | Invalid request parameters |
| 401 | Authentication failed — check API Key |
| 402 | Insufficient account balance |
| 403 | IP not allowed for this key, or the key is restricted to other models |
| 404 | Task not found, or it has expired |
| 409 | Duplicate request — an identical submit arrived moments ago. Nothing was charged; retry is safe |
| 413 | Payload too large — see the character and file-size limits for this model |
| 429 | Rate limit exceeded — retry after the Retry-After header |
| 500 | Internal server error |
| 504 | Upstream timed out — nothing was delivered; retry is safe |