Which mode does the Happy Horse 1.0 API pick for my request?

Routing priority is video_url > first_frame_image > image_urls > prompt-only. The three media fields are mutually exclusive in pairs; the only legal combination is video_url + image_urls (EDIT mode with up to 5 style references).

What resolutions and durations does the Happy Horse 1.0 API support?

The Happy Horse 1.0 API supports 720P and 1080P. Duration is any integer from 3 to 15 seconds (default 5). In EDIT mode the output length matches the source video, so the duration parameter is ignored.

Can the Happy Horse 1.0 API keep the source audio in edit mode?

Yes. Pass audio_setting=origin to retain the source soundtrack; audio_setting=auto regenerates audio. The Happy Horse 1.0 API only honors audio_setting when video_url is set.

How long can a Happy Horse 1.0 API video be?

Output length is 3 to 15 seconds. Source videos longer than 15 seconds in EDIT mode are auto-truncated from 0 to 15s upstream — slice the input first if you need a later segment.

Where is the full Happy Horse 1.0 API reference?

The full Happy Horse 1.0 API parameter list, error codes, and runnable cURL examples live at /docs/happyhorse-1-0.

Is Happy Horse 1.0 API free or paid?

Paid. Completed generations are charged at the rates in this page's pricing table. Eligible new accounts may receive promotional test credits; availability and amount are shown at signup or in the dashboard. Technical or provider failures are refunded automatically, except where this page documents a charged output-moderation block.

Does Happy Horse 1.0 API require a monthly subscription?

No. Pricing is pay-as-you-go: $1 buys 1,000 credits and credits never expire. Cost scales with what you generate rather than with a recurring fee.

How do I get a Happy Horse 1.0 API key?

Sign up and create a key in the dashboard, no card required. Pass it as a Bearer token in the Authorization header.

Happy Horse 1.0 API — Text, Image & Video Edit in One Endpoint

Q: How much does the Happy Horse 1.0 API cost?

Happy Horse 1.0 API pricing is per-second × resolution. See current 720P and 1080P rates in the pricing table on this page. EDIT mode uses the same rates, and routing mode never changes the price.

One Happy Horse 1.0 API call covers text-to-video, image-to-video, reference video, and video edit. 720P or 1080P, 3 to 15 seconds, native audio in edit mode.

Highlights: 3–15 s · 720P / 1080P · video edit mode
Best for: Ads, dance clips, video edits
Input: Text, images, or a source video
Output: Video (mp4)

Input

Prompt*

≤ 2500 chars · optional in image-to-video mode

Resolution

Default 1080P

Aspect ratio

Ignored in image-to-video and edit modes

Duration (seconds)5

3 to 15 · ignored in edit mode

Watermark

Default off

Seed

[0, 2147483647] · same seed ≈ similar output

Result

Try one of these prompts

What is the Happy Horse 1.0 API?

Happy Horse 1.0 is Alibaba Cloud's unified video model, exposed on reAPI as one async endpoint that picks its mode from the request body: a prompt alone for text-to-video, a first-frame image for image-to-video, 1 to 9 reference images for reference-to-video, or a source clip for video editing with up to 5 style references and a keep-or-regenerate audio switch. Clips run 3 to 15 seconds at 720P or 1080P with prompts up to 2,500 characters. Pricing depends only on resolution and duration — the mode never changes the rate — and edit jobs bill from the source clip's server-probed length.

Happy Horse 1.0 API generating video from text, image, and reference inputs

What you can build with this model

Real-world workflows and production use cases you can build and ship with this model.

Animate any photo with the Happy Horse 1.0 API

Pass a first-frame image and a motion prompt. The Happy Horse 1.0 API returns a 3 to 15 second clip from the same endpoint as your text-to-video calls — no model swap.

Generate a clip

Compose fresh scenes from reference images

Send 1 to 9 reference images alongside a prompt. The Happy Horse 1.0 API fuses subject, style, and props into a brand-new scene — product shots, character reskins, stylized social posts.

Restyle existing footage without re-shooting

Pass video_url to the Happy Horse 1.0 API and the source motion stays intact — only the look changes. Combine with up to 5 style images and audio_setting=origin to keep the original soundtrack.

Pricing

Credit-based — 1 credit = $0.001 USD. Pay only for completed generations.

First test cost

$0.732732 credits

One 5-second sample at the cheapest tier.

Testing budget guide

Add credits

$10

≈ 13 tests

$50

≈ 68 tests

$100

≈ 136 tests

Model	Category	Price
Standard	720P	$0.163 163 credits · 1 second
Standard	1080P	$0.288 288 credits · 1 second
Official	720P	$0.147 147 credits · 1 second
Official	1080P	$0.259 259 credits · 1 second

Why reAPI

One endpoint, four modes

The Happy Horse 1.0 API auto-routes T2V, I2V, R2V, and EDIT by request shape. Routing priority is video_url > first_frame_image > image_urls > prompt-only. No model swap, no second integration.

Pricing by resolution × seconds

The Happy Horse 1.0 API is billed per-second × resolution. See current 720P and 1080P rates in the pricing table on this page. Mode does not change the rate, and failed jobs refund automatically.

Native audio in edit mode

Set audio_setting=origin to retain the source soundtrack or auto to regenerate audio. The Happy Horse 1.0 API ships voiced clips without a separate TTS step.

Ship the Happy Horse 1.0 API in three steps

step 01
Create an API key
Sign up and grab a key from the dashboard. Free credits cover your first Happy Horse 1.0 API calls — no card required.
Open
step 02
Submit a video task
POST to /api/v1/videos/generations with model = happyhorse-1.0. The Happy Horse 1.0 API returns a task ID immediately.
Open
step 03
Poll the result
GET /api/v1/tasks/:id until status is completed. Download the Happy Horse 1.0 video and ship it.
Open

docs/api/happyhorse-1-0

API reference

Drop-in code and the full parameter table.

View full reference

curl -X POST https://reapi.ai/api/v1/videos/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "happyhorse-1.0",
    "prompt": "A coastal road at sunset, slow-motion camera push-in",
    "resolution": "1080P",
    "size": "16:9",
    "duration": 5
  }'

Parameter validation failed

Rejected synchronously with the failing field named. Check enum values, ranges, and URL fields — nothing is charged.

Authentication or balance issue

401 means a missing or invalid Bearer key; 402 means the reserve exceeds your balance. Manage keys and credits in the console.

Content or material rejected

Reference material and outputs pass automated moderation. Rejected tasks fail with a clear error and a full refund.

Task failed or timed out

A task that reaches a failed state is never charged — the reserve refunds automatically. Keep the task id and retry when ready.

Frequently asked questions

Common questions about this model.

The Happy Horse 1.0 API is Alibaba Cloud Bailian's unified video generation endpoint. One model id (happyhorse-1.0) auto-routes text-to-video, image-to-video, reference-to-video, and video edit based on which fields the request carries.