Video Image to Video Kie.ai

HappyHorse 1.1 Reference-to-Video

HappyHorse 1.1 Reference-to-Video costs $0.174/s (1080p) on FairStack · an image to video model for Character-consistent scenes, Product videos from stills, Multi-shot storytelling. No subscription required. Pay per generation with full REST API access. FairStack applies a transparent 20% margin on infrastructure cost so you always see the real price.

FairStack price

$0.174/s

1080p

Platform fee

Flat 20%

Try HappyHorse 1.1 Reference-to-Video API Quickstart Last updated 2026-11-10

What is HappyHorse 1.1 Reference-to-Video?

Key Features

1-9 reference images

Native audio + Foley

Multilingual lip-sync

Nine aspect ratios at 720p/1080p

What are HappyHorse 1.1 Reference-to-Video's strengths?

Multi-reference consistency

Priced below HappyHorse 1.0

Rich native audio

What are HappyHorse 1.1 Reference-to-Video's limitations?

References must be ≥400px short side, ≤10MB

No 4K tier

What is HappyHorse 1.1 Reference-to-Video best for?

Character-consistent scenes Product videos from stills Multi-shot storytelling

How much does HappyHorse 1.1 Reference-to-Video cost?

Metric

FairStack

Details

1080p(default)

$0.174/s

Billed per second, 20% platform fee included.

720p

$0.135/s

Billed per second, 20% platform fee included.

Subscription

None

Pay per generation only

How does HappyHorse 1.1 Reference-to-Video perform across capabilities?

HappyHorse 1.1 — Kie.ai primary ($0.1125/s 720p), fal.ai fallback — r2v

motion quality

89%

visual quality

90%

prompt adherence

86%

temporal coherence

88%

audio quality

90%

reference fidelity

87%

How do I use the HappyHorse 1.1 Reference-to-Video API?

curl

curl -X POST https://api.fairstack.ai/v1/generations/video \
  -H "Authorization: Bearer $FAIRSTACK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "happyhorse-1-1-r2v",
    "input": {
      "prompt": "Your prompt here",
      "image_url": "https://example.com/photo.jpg"
    }
  }'

Python

import os
import requests

response = requests.post(
    "https://api.fairstack.ai/v1/generations/video",
    headers={
        "Authorization": f"Bearer {os.environ['FAIRSTACK_API_KEY']}",
        "Content-Type": "application/json",
    },
    json={
      "model": "happyhorse-1-1-r2v",
      "input": {
        "prompt": "Your prompt here",
        "image_url": "https://example.com/photo.jpg"
      }
    },
)

result = response.json()
print(result["data"])

Node.js

const response = await fetch("https://api.fairstack.ai/v1/generations/video", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.FAIRSTACK_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "happyhorse-1-1-r2v",
    "input": {
      "prompt": "Your prompt here",
      "image_url": "https://example.com/photo.jpg"
    }
  }),
});

const result = await response.json();
console.log(result.data);

What parameters does HappyHorse 1.1 Reference-to-Video support?

Parameter

Type

Default

Details

duration

integer

Range: 3–15

resolution

enum

1080p

Options: 720p, 1080p

aspect_ratio

enum (optional)

16:9

Options: 16:9, 9:16, 1:1, 4:3, 3:4, 4:5...

Frequently Asked Questions

How much does HappyHorse 1.1 Reference-to-Video cost?

HappyHorse 1.1 Reference-to-Video costs $0.174/s (1080p) on FairStack as of 2026-11-10. This price includes FairStack's transparent 20% margin on infrastructure cost. No subscription or monthly fee — you pay per generation only. Minimum deposit is $1.

What is HappyHorse 1.1 Reference-to-Video and what is it best for?

HappyHorse 1.1's reference-to-video mode composes a new 3-15 second scene guided by 1-9 reference images — characters, products, or styles — with native audio, Foley, and multilingual lip-sync. Supports nine aspect ratios at 720p or 1080p. HappyHorse 1.1 Reference-to-Video is best for Character-consistent scenes, Product videos from stills, Multi-shot storytelling. Available via FairStack's REST API with curl, Python, and Node.js SDKs.

Does HappyHorse 1.1 Reference-to-Video have an API?

Yes. HappyHorse 1.1 Reference-to-Video is available via FairStack's REST API at api.fairstack.ai. Send a POST request to /v1/generations/video with your API key, the model key, and an input object (input.prompt). Works with curl, Python requests, Node.js fetch, and any HTTP client. No SDK installation required.

How does HappyHorse 1.1 Reference-to-Video compare to other video models?

HappyHorse 1.1 Reference-to-Video excels at Character-consistent scenes, Product videos from stills, Multi-shot storytelling. It is an image to video model priced at $0.174/s (1080p) on FairStack. Key strengths: Multi-reference consistency, Priced below HappyHorse 1.0. Compare all video models at fairstack.ai/models.