# imgnAI Katana Chat Completions API

> 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

## Facts

- Endpoint: POST https://kat.imgnai.com/v1/chat/completions
- Price: $0.052/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/imgnai-katana-chat-completions-api-0b595829
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ej4XYepLTzjMDffd0HaPV

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability imgnai-katana-chat-completions-api-0b595829 -d '<json body>'
```

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.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "model",
  "messages"
 ],
 "properties": {
  "model": {
   "type": "string"
  },
  "messages": {
   "type": "array"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/imgnai-katana-chat-completions-api-0b595829/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kat.imgnai.com](https://www.zero.xyz/host/kat.imgnai.com/llms.txt)