HappyHorse 1.0

HappyHorse 1.0 is Alibaba's cinematic video generation model, exposing two modes: text-to-video and image-to-video.

Models

Model Name	Mode
`happyhorse-1.0-text-to-video`	Text-to-video
`happyhorse-1.0-image-to-video`	Image-to-video

Pricing

Billed per second × resolution:

Resolution	Credits/sec
`720p`	34
`1080p`	67

Credits are pre-charged as duration × rate when the task is created. Failed tasks are automatically refunded.

Create Task

POST https://api.aivideoapi.ai/v1/videos/generations

Request Body

Field	Type	Required	Description
`model`	string	Yes	`happyhorse-1.0-text-to-video` or `happyhorse-1.0-image-to-video`
`input`	object	Yes	Generation parameters, see below
`callback_url`	string	No	URL to receive task completion/failure notifications

Text-to-Video Input

Field	Type	Required	Description
`prompt`	string	Yes	Text prompt, max 2500 characters
`aspect_ratio`	string	No	`16:9`, `9:16`, `1:1`, `4:3`, or `3:4`
`resolution`	string	No	`720p` or `1080p` (default `720p`)
`duration`	integer	No	3-15 seconds (default `5`)
`seed`	integer	No	Integer between `0` and `2147483647`

Image-to-Video Input

Field	Type	Required	Description
`prompt`	string	Yes	Text prompt, max 2500 characters
`image_urls`	string[]	Yes	Exactly 1 image URL, used as the first frame
`resolution`	string	No	`720p` or `1080p` (default `720p`)
`duration`	integer	No	3-15 seconds (default `5`)
`seed`	integer	No	Integer between `0` and `2147483647`

Image-to-video accepts a single HTTP(S) image URL only. Recommended formats: JPEG / PNG / BMP / WEBP. The source image should be at least 300px on the short side, under 10 MB, and roughly within a 1:2.5 to 2.5:1 aspect ratio.

Example: Text-to-Video

curl -X POST https://api.aivideoapi.ai/v1/videos/generations \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "happyhorse-1.0-text-to-video",
    "input": {
      "prompt": "A cinematic tracking shot through a rainy neon street at night",
      "aspect_ratio": "16:9",
      "resolution": "720p",
      "duration": 5
    }
  }'

Example: Image-to-Video

curl -X POST https://api.aivideoapi.ai/v1/videos/generations \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "happyhorse-1.0-image-to-video",
    "input": {
      "prompt": "The girl slowly turns her head and the camera gently pushes in",
      "image_urls": ["https://example.com/portrait.png"],
      "resolution": "1080p",
      "duration": 5,
      "seed": 12345
    }
  }'

Response

{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "8b6a5162-5c91-4a42-8e80-4c8ef5486f24"
  }
}

Query Task

curl https://api.aivideoapi.ai/v1/tasks/{taskId} \
  -H "Authorization: Bearer sk-your-api-key"

Status transitions: pending -> processing -> completed or failed.

Processing

{
  "id": "8b6a5162-5c91-4a42-8e80-4c8ef5486f24",
  "status": "processing",
  "model": "happyhorse-1.0-text-to-video",
  "created_at": 1775400000,
  "progress": null
}

Completed

{
  "id": "8b6a5162-5c91-4a42-8e80-4c8ef5486f24",
  "status": "completed",
  "model": "happyhorse-1.0-text-to-video",
  "created_at": 1775400000,
  "completed_at": 1775400123,
  "output": {
    "urls": [
      "https://file.aivideoapi.ai/videos/2026/04/29/happyhorse-example.mp4"
    ],
    "metadata": {
      "model": "alibaba/happyhorse-1.0/text-to-video",
      "has_nsfw_contents": false
    }
  }
}

Failed

{
  "id": "8b6a5162-5c91-4a42-8e80-4c8ef5486f24",
  "status": "failed",
  "model": "happyhorse-1.0-text-to-video",
  "created_at": 1775400000,
  "error": {
    "code": "upstream_error",
    "message": "Video generation failed"
  }
}

When a task fails, pre-charged credits are automatically refunded.

Error Codes

When a request fails, the API returns a JSON error response:

{
  "error": {
    "code": "insufficient_credits",
    "message": "Your credit balance is too low. Please top up.",
    "type": "billing_error"
  }
}

Error Reference

HTTP Status	Code	Type	Description
400	`invalid_request`	invalid_request_error	Missing or invalid parameters
401	`invalid_api_key`	authentication_error	API key is invalid, disabled, or deleted
402	`insufficient_credits`	billing_error	Credit balance too low, please top up
403	`ip_not_allowed`	permission_error	Request IP not in the key's allowlist
404	`model_not_found`	invalid_request_error	Model does not exist or is inactive
404	`task_not_found`	invalid_request_error	Task ID does not exist
429	`rate_limit_exceeded`	rate_limit_error	Too many requests, please slow down
429	`spend_limit_exceeded`	billing_error	Key spend limit reached (hourly/daily/total)
500	`internal_error`	api_error	Unexpected server error
503	`upstream_error`	upstream_error	Upstream AI provider returned an error

Common Scenarios

invalid_request (400)

Returned when required fields are missing or invalid.

{
  "error": {
    "code": "invalid_request",
    "message": "'model' is required.",
    "type": "invalid_request_error"
  }
}

insufficient_credits (402)

Your balance is too low. Check your balance with GET /v1/credits and top up in Dashboard > Billing.

invalid_api_key (401)

Possible causes:

The key does not start with sk-
The key has been disabled or deleted
The user account has been banned

upstream_error (503)

The upstream AI provider returned an error. This may happen when:

The input contains sensitive or prohibited content
The provider is temporarily unavailable
The request parameters are not supported by the provider

Credits are automatically refunded when a task fails due to upstream errors.