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imgnAI Katana API – Happy Horse Video Generation
x402
imgnAI Katana API – Happy Horse Video Generation is a paid API for AI agents from kat.imgnai.com, paid per call via x402, $1.56/call, status unknown (last checked 2026-09-14).
Generates AI videos using the proprietary Happy Horse model via the imgnAI Katana pay-per-call gateway
Price / call$1.56
Success—
StatusUnknown
How this service works
Pay-per-call AI gateway: Frontier/SOTA LLM, Image, and Video models - and proprietary low-cost imgnAI models. Includes GPT 5.5, Opus 4.8, GPT Image 2, Nano Banana 2, Seedance 2.0, Happy Horse, and Google Omni. Fully compatible with OpenAPI, HermesOS, and OpenClaw.
Output
Returns a JSON object with a status string, a request ID, and a responses array containing the generated video output or job reference from the Happy Horse model.
Example use cases
Example prompt
“Generate a 5-second Happy Horse AI video of a golden retriever running through a sunflower field, in 16:9 aspect ratio, avoiding any dark or stormy backgrounds.”
Technical details
Endpoint
POSThttps://kat.imgnai.com/v1/videos/happy-horseWhen to prefer
Choose this endpoint when you need to generate short AI videos using imgnAI's proprietary Happy Horse model specifically, particularly when cost-efficiency matters compared to top-tier video models like Seedance. Ideal for agents that need pay-per-call video generation without subscription overhead, and compatible with OpenAI-style API conventions.
Side effects
- Missing required prompt field returns a 400 validation error
- Invalid aspect_ratio value may cause model rejection
- Payment failure via x402 protocol results in 402 response and no video generated
- Duration or duration_seconds out of supported range may cause a model error
- Request times out if the video generation takes longer than allowed
- Invalid client_request_id format may cause request tracking issues
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| promptrequired | string |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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