happyhorse-1.1-r2v API

Use the exact model ID happyhorse-1.1-r2v. The model field must match this page exactly.

Authentication and endpoint

Use a Modelflare API key with https://modelflare.dev/v1. The gateway entry point is POST /v1/videos.

Authorization: Bearer YOUR_MODELFLARE_API_KEY

Create a task

curl https://modelflare.dev/v1/videos \
  -H "Authorization: Bearer YOUR_MODELFLARE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "happyhorse-1.1-r2v",
    "input": {"prompt": "A white cat runs through a neon-lit street in the rain, cinematic tracking shot"},
    "parameters": {"resolution": "1080P", "duration": 5, "watermark": false}
  }'

Poll and download

Save the task ID. Poll GET /v1/videos/{task_id} and download with GET /v1/videos/{task_id}/content. Result URLs may expire, so transfer the file promptly.

curl https://modelflare.dev/v1/videos/TASK_ID \
  -H "Authorization: Bearer YOUR_MODELFLARE_API_KEY"

Request notes

HappyHorse uses input.prompt; choose the input.media shape that matches the t2v, i2v, or r2v model ID.

Request parameters

HappyHorse R2V places 1–9 reference_image items in input.media and references them in order from the prompt.

Field	Required	Notes
`model`	Yes	`happyhorse-1.1-r2v`
`input.prompt`	Yes	Text description or reference instructions
`input.media[]`	Yes	1–9 `reference_image` items
`parameters.resolution`	No	`720P` / `1080P`
`parameters.ratio`	No	`16:9` / `9:16` / `1:1` / `4:3` / `3:4` / `4:5` / `5:4` / `9:21` / `21:9`
`parameters.duration`	No	3–15 seconds; use the official default
`parameters.watermark`	No	Whether to add the HappyHorse watermark
`parameters.seed`	No	Optional random seed

Input and output limits

R2V uses 1–9 reference_image items; refer to them in prompt order as Image 1, Image 2, and so on.

Supported scope

This page covers Modelflare model generation and editing calls. Search or map enrichment, voice management, and element-library management are resource APIs outside this public model-call surface and are not required request fields.

Pricing and billing

This model uses per-second video billing. See the model pricing page for the current customer price, reference list price, and complete specification.