Varosity

HappyHorse 1.0 API

Alibaba's HappyHorse 1.0 — the #1-ranked AI video model on Artificial Analysis (text- and image-to-video). Joint audio+video, multilingual lip-sync, up to 1080p.

$0.147/s on Varosity credits ($0.140/s with your own key). Clips up to 15s with native audio.

Try HappyHorse 1.0 Get an API key

no fal account needed · no subscription · failed renders never billed

Best for

  • #1-ranked motion + prompt adherence
  • joint audio-video generation
  • multilingual lip-sync
  • 1080p

Call it from your code

One Varosity key works for every model. Video renders are async — the response has a jobId; poll GET /api/v1/jobs/{jobId} until status is "succeeded", then read outputUrl.

curl -X POST https://varosity.ai/api/v1/video/generate \
  -H "Authorization: Bearer $VAROSITY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "cinematic aerial of a coastal road at golden hour, slow push-in",
    "modelId": "happyhorse-1.0",
    "aspectRatio": "16:9",
    "durationSec": 5
  }'

Or ask your agent

Connect Claude, Cursor, or any MCP client to https://varosity.ai/api/mcp with your key, then say:

"Use Varosity with happyhorse-1.0 to make a 5-second clip of …"
Agent setup guide

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