HappyHorse 1.1 API

HappyHorse 1.1 is a video generation model live on EvoLink with 3 variants (text-to-video, image-to-video, reference-to-video) and per-second billing.

Model Type:

✓Text to Video (T2V)Image to Video (I2V)Reference to Video (R2V)

Price: $0.139 - 0.186(~ 9.4427 - 12.65322 credits) per second of video

Highest stability with guaranteed 99.9% uptime. Recommended for production environments.

Use the same API endpoint for all versions. Only the model parameter differs.

Prompt

171 (suggested: 2,000)

Aspect Ratio

Quality

Duration5s

3s15s

Click Generate to see preview

History

Max 20 items

0 running · 0 completed

Your generation history will appear here

Pricing

Model	Mode	quality	Price
Happy Horse 1.1 Text to Video	Video Generation	720p	$0.139/ second(9.4427 Credits)
Happy Horse 1.1 Text to Video	Video Generation	1080p	$0.186/ second(12.6533 Credits)

Happy Horse 1.1 Text to Video

Video Generation

quality:720p

Price:

$0.139/ second

(9.4427 Credits)

Happy Horse 1.1 Text to Video

Video Generation

quality:1080p

Price:

$0.186/ second

(12.6533 Credits)

If it's down, we automatically use the next cheapest available—ensuring 99.9% uptime at the best possible price.

HappyHorse 1.1 API

Name: EvoLink AI Model API Platform
Brand: EvoLink
Availability: InStock

HappyHorse 1.1 generates physically realistic, fluid-motion video from text, a first-frame image, or 1~9 reference images. Live on EvoLink with per-second billing and async delivery, on the same unified endpoint used for every other video model.

HappyHorse 1.1 AI video generation showcase

About HappyHorse 1.1

HappyHorse 1.1 is a video generation model for physically realistic, smooth-motion clips. EvoLink offers 3 variants — text-to-video, image-to-video, and reference-to-video (1~9 reference images) — at 720p and 1080p resolutions.

HappyHorse 1.1 is available now on EvoLink through the same unified API gateway used for Seedance 2.0, Kling 3.0, Sora 2, and Veo 3.1 — one API key, one billing system, no additional vendor accounts. Use the pricing table on this page for current 720p and 1080p rates.

HappyHorse 1.1 API technical capabilities

Core capabilities for text-to-video, image-to-video, and reference-to-video generation

T2V

Text-to-Video

Generate video from text descriptions with physical realism and smooth motion across 720p and 1080p.

I2V

Image-to-Video

Animate a first-frame image into a video clip with natural motion and strong subject preservation.

R2V

Reference-to-Video

Drive generation with 1~9 reference images, referenced in the prompt as character1, character2, ... to compose multi-subject scenes.

Billing

Per-Second Billing

HappyHorse on EvoLink uses per-second billing for cost control. Use the pricing table on this page for current 720p and 1080p rates.

Async

Async Task Delivery

Production-ready async task handling with status tracking and webhook callbacks. The same delivery pattern used for all video models on EvoLink.

Routing

Unified API Routing

Route HappyHorse through EvoLink's unified video generation API and switch between supported video models with the model parameter.

HappyHorse 1.1 API capabilities

Text-to-Video Generation

HappyHorse 1.1 generates video from text prompts with strong physical realism and smooth motion. Describe scenes, motion, and style in natural language to produce clips for marketing, social content, or creative projects.

Image-to-Video Generation

HappyHorse 1.1 also supports image-to-video generation, turning a first-frame image into an animated video clip while preserving subject identity and adding natural motion.

Unified API Access via EvoLink

Access HappyHorse through the same EvoLink API endpoint used for Seedance 2.0, Kling 3.0, Sora 2, and 40+ other models. One API key, one billing system, and the same async task delivery pattern you already use.

EvoLink unified API access for HappyHorse

When to choose HappyHorse 1.1 on EvoLink

Use HappyHorse 1.1 when your workflow needs text prompts, one first-frame image, or 1~9 ordered image references through EvoLink's unified video API.

Use HappyHorse for text and image-reference workflows

HappyHorse 1.1 gives teams three clear routes: prompt-only generation, first-frame animation, and reference-to-video with 1~9 ordered images.

Choose another route when inputs change

If a production job requires video or audio references, route that workflow to a model that supports those input types. Keep HappyHorse 1.1 for text, first-frame, and ordered image-reference jobs.

Why route through EvoLink

On EvoLink, HappyHorse plugs into your existing workflow without a new vendor account, a new billing path, or a new integration. Switch between HappyHorse, Seedance, Kling, and Sora with one model parameter change.

How to integrate HappyHorse API through EvoLink

The same three-step integration used for every video model on EvoLink.

Get your API key

Sign up on EvoLink and create an API key from your dashboard. Free credits are included with every new account — use them to test HappyHorse 1.1 right away.

Submit a generation task

Send a POST request to /v1/videos/generations with your text prompt or image reference. The API returns a task ID for async tracking. The same endpoint and request format used for Seedance, Kling, and Sora.

Retrieve your video

Poll the task status endpoint or configure a webhook callback. Once complete, download your video file. Iterate on prompts using the same API structure for fast production cycles.

Choose the right EvoLink video route

Use this table as a routing aid, then check each model page for current inputs, pricing, and API details.

	HappyHorse 1.1	Seedance 2.0	Kling 3.0
Text-to-Video	✓	✓	✓
Image-to-Video	✓	✓	✓
Reference-to-Video	✓ (1~9 images)	✓ (9 img + 3 vid + 3 audio)	—
Native Audio	—	✓ (multi-language lip-sync)	—
API Pricing	Per-second billing	Per-second billing	Per-second billing
API Availability	Live on EvoLink	Live on EvoLink	Live on EvoLink

Read the HappyHorse 1.1 API guide →

HappyHorse API FAQ

Everything you need to know about the product and billing.

HappyHorse 1.1 is a video generation model for physically realistic, smooth-motion clips. EvoLink offers 3 variants: text-to-video, image-to-video, and reference-to-video (1~9 reference images), at 720p and 1080p.

Yes. HappyHorse 1.1 is live on EvoLink with all 3 variants — text-to-video, image-to-video, and reference-to-video. Sign up for an account to receive free credits and start generating today.

Use happyhorse-1.1-text-to-video for prompt-only jobs, happyhorse-1.1-image-to-video for one first-frame image, and happyhorse-1.1-reference-to-video for 1~9 ordered reference images.

Yes. Use the reference-to-video route with 1~9 ordered image URLs, then refer to them in the prompt as character1, character2, and so on.

HappyHorse 1.1 on EvoLink uses per-second billing with separate 720p and 1080p rates. Use the pricing table on this page for the current rates across the 3 variants.

On EvoLink, HappyHorse 1.1 supports 3 modes: text-to-video, image-to-video, and reference-to-video (1~9 reference images). Each variant has its own playground and API endpoint on this page.

Yes. HappyHorse 1.1 uses the same API key, endpoint, and billing system as Seedance 2.0, Kling 3.0, Sora 2, and all other models on EvoLink. No additional vendor setup required.

Sign up on EvoLink, create an API key, and call the unified video API with model = happyhorse-1.1-text-to-video (or one of the other 2 variants). The endpoint, auth, and async delivery format are identical to Seedance, Kling, and Sora — switch by changing one parameter.

Pricing, playground, and the API reference for all 3 variants are live on this page.

API Reference

Select endpoint

Authentication

All APIs require Bearer Token authentication.

Header

Authorization: 
Bearer YOUR_API_KEY

Get API Key

POST

/v1/videos/generations

Create Video

Happy Horse 1.1 Text-to-Video (happyhorse-1.1-text-to-video) generates a 3~15 second video purely from a text prompt. Supports 720P / 1080P resolutions and 9 aspect ratios.

Asynchronous processing — use the returned task ID to .

Generated video links are valid for 24 hours, please save them promptly.

Request Parameters

modelstringRequiredDefault: happyhorse-1.1-text-to-video

Video generation model name. Fixed value for this endpoint.

Examplehappyhorse-1.1-text-to-video

promptstringRequired

Text description of the video to generate.

Notes

Up to 2500 Chinese characters or 5000 non-Chinese characters; excess is auto-truncated.
Detailed shot-by-shot descriptions yield better multi-shot narratives, e.g. "Shot 1 [0~3s] wide angle: ...; Shot 2 [3~6s] medium shot: ...".

Example

A miniature city built from cardboard and bottle caps comes to life at night. A cardboard train slowly passes through, dotted with tiny lights illuminating the path ahead.

qualitystringOptionalDefault: 720p

Output resolution tier. Directly affects billing.

Value	Description
720p	Standard quality (1.0x price)
1080p	HD quality (1.34x price)

Example720p

aspect_ratiostringOptionalDefault: 16:9

Output video aspect ratio.

Value	Description
16:9	Landscape (default)
9:16	Portrait
1:1	Square
4:3	Standard
3:4	Portrait standard
4:5	Vertical
5:4	Horizontal
9:21	Ultra-tall
21:9	Cinematic

Example16:9

durationintegerOptionalDefault: 5

Output video duration in seconds. Directly affects billing.

Notes

Range: 3~15 (any integer).
Total cost = base_price × duration × resolution_multiplier.

Example5

seedintegerOptional

Random seed for deterministic outputs. Pass 0 or omit to use a random seed.

Notes

Range: 0 ~ 2147483647 (0 is treated as unset)
Same seed + same prompt may still produce slightly different results due to model probabilistic nature.

Example42

callback_urlstringOptional

HTTPS callback URL to be invoked when the task finishes.

Notes

Triggered on completion / failure / cancellation.
HTTPS only, no internal IPs.
Max length: 2048 chars. Timeout: 10s, max 3 retries.

Examplehttps://your-domain.com/webhooks/happyhorse-task

Request Example

{
  "model": "happyhorse-1.1-text-to-video",
  "prompt": "A majestic eagle soaring through mountain peaks at sunset, cinematic lighting",
  "quality": "720p",
  "aspect_ratio": "16:9",
  "duration": 5,
  "seed": 42
}

Response Example

{
  "created": 1745726400,
  "id": "task-unified-1745726400000000000-aBcDeFgH-happyhorse-1.1-text-to-video",
  "model": "happyhorse-1.1-text-to-video",
  "object": "video.generation.task",
  "progress": 0,
  "status": "pending",
  "task_info": {
    "can_cancel": false
  },
  "type": "video"
}