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imgnAI Katana Chat Completions API
x402
imgnAI Katana Chat Completions API is a paid API for AI agents from kat.imgnai.com, paid per call via x402, $0.052/call, status unknown (last checked 2026-09-14).
Pay-per-call OpenAI-compatible chat completions gateway supporting frontier LLMs, image generation, and video models including GPT-5.5, Claude Opus 4.8, GPT Image 2, and Seedance 2.0
Price / call$0.052
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 an OpenAI-compatible JSON object containing a choices array with the model's response (text, image URL, or video URL depending on the model), plus a usage object with token counts and billing metadata.
Example use cases
Example prompt
“Using the imgnAI Katana gateway, send a chat completion request with model 'gpt-image-2' and ask it to draw a photorealistic sunset over a mountain lake — limit the response to 1024 tokens.”
Technical details
Endpoint
POSThttps://kat.imgnai.com/v1/chat/completionsWhen to prefer
Choose this endpoint when you need pay-per-call access to frontier models (GPT-5.5, Claude Opus 4.8, GPT Image 2, Seedance 2.0) without committing to a subscription, or when you want a single OpenAI-compatible interface across LLM, image, and video modalities, or when you want to pay with USDC crypto micropayments via the x402 protocol.
Side effects
- 402 Payment Required if x402 payment header is missing or insufficient (0.05425 USDC required)
- 400 Bad Request if required fields 'model' or 'messages' are absent
- 404 or model error if an unsupported model name is passed
- 503 or timeout if upstream model provider is unavailable
- Rate limit or capacity error if too many concurrent requests
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| modelrequired | string | |
| messagesrequired | array |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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