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x402engine GPT-5.6 Luna Pro LLM
x402
x402engine GPT-5.6 Luna Pro LLM is a paid API for AI agents from x402engine.app, paid per call via x402, $0.00486/call, status unknown (last checked 2026-10-12).
Runs a GPT-5.6-Luna-Pro chat completion request via micropayment-gated API, returning an OpenAI-compatible response for $0.00486 USDC per call.
Price / call$0.00486
Success—
StatusUnknown
How this service works
125 production APIs behind HTTP 402 micropayments. 87 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.
Output
Returns an OpenAI-compatible JSON chat completion object with the assistant's message content, finish reason, model name, and optionally tool calls. Streaming mode returns SSE chunks after payment settlement.
Example use cases
One-off frontier LLM query for agent
“Ask GPT-5.6 Luna Pro: 'What are the top 5 use cases for AI agents in enterprise software?' — I want a concise answer, no subscription needed, just pay per call.”
Tool-calling workflow in agent pipeline
“Send a chat completion to GPT-5.6 Luna Pro with a tool definition for 'get_weather(city: string)' and user message 'What's the weather like in Tokyo right now?' — use the tool-calling response to trigger the next step.”
Streaming assistant response for live UI
“Stream a reply from GPT-5.6 Luna Pro to this prompt: 'Write a 200-word product description for a noise-cancelling headphone aimed at remote workers' — I need it streamed token by token for my live UI.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/gpt-5.6-luna-pro?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need access to GPT-5.6 Luna Pro specifically without a monthly OpenAI subscription, want strict per-call cost control using USDC micropayments on Base/Solana/MegaETH, or are building an AI agent that must pay for LLM calls autonomously using the x402 HTTP 402 payment protocol. Prefer this over self-managed OpenAI keys when operating serverless or agent-native architectures where pay-per-use is more economical than flat subscriptions.
Side effects
- Payment not settled — 402 returned if USDC balance is insufficient
- Invalid messages array — 400 if required messages field is missing
- Model unavailable — 503 if GPT-5.6 Luna Pro is temporarily down
- Malformed tool definition — 400 if tool object lacks required function field
- Stream timeout — connection drop if SSE stream is not consumed promptly
- Seed not supported — ignored silently or error if model doesn't support it
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "openai/gpt-5.6-luna-pro",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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