Use HappyHorse 1.0 through Rivya Public API v1 with model id happyhorse-1-0, supported inputs, parameters, Files API rules, credits, and response examples.

Available via APIText or URL ready; reference modes use Files APIVideo

API model id

happyhorse-1-0

Inputs

text, file

Files API

Required for reference modes

Base credits

Capability

Video

Billing

FIXED

Prompt limit

5000 characters

Request contract

Send the model id at the top level. Model-specific controls belong in params.

Key	Type	Required	Default	Description
model	string	Yes	happyhorse-1-0	Use the happyhorse-1-0 API model id.
prompt	string	Yes	-	Maximum 5000 characters for this model.
params	object	No	-	Model-specific parameter object. Use the rows below for allowed keys.
client_request_id	string	No	-	Optional client-side id for tracing requests in your system.

Model parameters

Key	Type	Required	Default	Range	Options	Description
resolution	select	No	1080p	-	720p, 1080p	Resolution
aspect_ratio	select	No	16:9	-	16:9, 9:16, 1:1, 4:3, 3:4	Aspect ratio
duration	number	No	5	min 3 / max 15	-	Duration
audio_setting	select	No	auto	-	auto, origin	Video audio
seed	number	No	0	min 0 / max 2147483647	-	Leave it empty for a new random result each time. Reusing the same integer makes it easier to reproduce or fine-tune a previous result. It stays closer only when the prompt and other key settings also remain similar, and it is not a guaranteed 1:1 match.

Upload policy

Upload reference files first, then place the returned URL and duration token inside params.referenceMediaItems.

Reference rule

Reference media: Use up to 9 images without a video, or 1 video with up to 5 image references for video editing.

Max files

Accepted file kinds

image, video

Duration token

Video and audio references should carry durationToken from /api/v1/files when duration verification is required.

kind	Max size	MIME types
image	10 MB	image/jpeg, image/png, image/webp
video	95 MB	video/mp4, video/quicktime

Minimal request

{
  "model": "happyhorse-1-0",
  "prompt": "A cinematic product reveal with smooth camera movement",
  "params": {
    "resolution": "1080p",
    "aspect_ratio": "16:9",
    "duration": 5,
    "audio_setting": "auto",
    "seed": 0
  }
}

Reference-file request

{
  "model": "happyhorse-1-0",
  "prompt": "A cinematic product reveal with smooth camera movement",
  "params": {
    "resolution": "1080p",
    "aspect_ratio": "16:9",
    "duration": 5,
    "audio_setting": "auto",
    "seed": 0,
    "referenceMediaItems": [
      {
        "url": "https://cdn.example.com/reference-image.png",
        "kind": "image",
        "name": "reference-image.png",
        "mimeType": "image/png"
      }
    ]
  }
}

Create response

The create endpoint returns a public task id. Poll the status endpoint until the task succeeds or fails.

{
  "id": "task_happyhorse_1_0_example",
  "status": "queued",
  "model": "happyhorse-1-0",
  "reserved_credits": 28,
  "final_credits": 0,
  "created_at": "2026-05-11T00:00:00.000Z",
  "updated_at": "2026-05-11T00:00:00.000Z",
  "result": null,
  "error": null
}

Common errors

validation_failed, insufficient_credits, idempotency_conflict, rate_limited, not_found

Some modes require Files API reference uploads.

HappyHorse 1.0 API Integration