# HappyHorse-1.0 API

> HappyHorse-1.0 — high-quality AI video generation.

- **Provider**: Alibaba
- **Model id**: `happyhorse-text-to-video`
- **Modality**: video
- **Price**: 14–24 credits /sec

## Overview

HappyHorse-1.0 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-text-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 | Text prompt describing the video to generate. Max 5000 characters. (example: A lone lighthouse keeper climbs a narrow spiral staircase at dawn, warm lamplight flickering over weathered stone walls as pale sea mist drifts through an open… — full value in the request example) |
| resolution | string | No | Output video resolution. Valid values: 720P, 1080P (default). (options: 720p \| 1080p) (default: 1080p) |
| aspect_ratio | string | No | Output aspect ratio. Valid values: 16:9 (default), 9:16, 1:1, 4:3, 3:4. (options: 16:9 \| 9:16 \| 1:1 \| 4:3 \| 3:4) (default: 16:9) |
| duration | number | No | Output duration in seconds (integer). Must be between 3 and 15. Defaults to 5. (range 3-15) (default: 5) |
| seed | number | No | Random seed. Range: [0, 2147483647]. If not specified, the system generates a seed automatically. Fixing the seed can improve reproducibility, but results may still vary due to the model’s stochasticity. |

### Request example

```json
{
  "modelId": "happyhorse-text-to-video",
  "input": {
    "prompt": "A lone lighthouse keeper climbs a narrow spiral staircase at dawn, warm lamplight flickering over weathered stone walls as pale sea mist drifts through an open arched window.",
    "resolution": "720p",
    "aspect_ratio": "16:9",
    "duration": 5,
    "seed": 1
  }
}
```

### Response example

```json
{
  "taskId": "281e5b0…f39b9",
  "creditsCharged": 70
}
```

## Query Task

`GET https://you.bot/api/v1/task/{taskId}?model=happyhorse-text-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 |