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imgnAI Katana API – Text Completion (qnaifu)
x402
imgnAI Katana API – Text Completion (qnaifu) 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 text/chat completion endpoint supporting frontier LLMs (GPT 5.5, Opus 4.8, Nano Banana 2, Google Omni) via an OpenAI-compatible messages interface
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 response object containing one or more completion choices (each with a message and finish reason), plus a usage object detailing prompt and completion token counts.
Example use cases
Example prompt
“Using the Katana qnaifu endpoint, send this conversation to a frontier model — system: 'You are a concise assistant', user: 'Explain the concept of zero-knowledge proofs in 3 sentences' — keep max_tokens to 200 and temperature at 0.7.”
Technical details
Endpoint
POSThttps://kat.imgnai.com/v1/text/qnaifuWhen to prefer
Choose this endpoint when you need a pay-per-call, no-subscription LLM completion compatible with the OpenAI messages format, especially in agentic pipelines using x402 crypto micropayments (USDC) or when you want access to imgnAI's proprietary models (Nano Banana 2, Happy Horse) alongside frontier models at $0.054 per call.
Side effects
- Payment not attached or insufficient USDC — 402 Payment Required
- messages array missing or empty — 400 Bad Request
- Model overloaded or unavailable — 503 Service Unavailable
- max_tokens exceeds model context limit — 400 or truncated response
- Invalid temperature value outside 0–2 range — 422 Unprocessable Entity
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| messagesrequired | array |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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