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GPT-5.6 Luna Chat Completions (x402, OpenAI-Compatible)
x402
GPT-5.6 Luna Chat Completions (x402, OpenAI-Compatible) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.019999/call, status unknown (last checked 2026-10-11).
Returns an OpenAI-compatible chat completion from the GPT-5.6 Luna model via a pay-per-call GET request priced in USDC over x402.
Price / call$0.019999
Success—
StatusUnknown
How this service works
GPT-5.6 Luna API Base USDC and OpenAI-compatible x402 chat: one request for $0.00293, paid by browser wallet or a quote-first agent fallback.
Output
A JSON object in OpenAI chat.completion format containing: a unique completion ID, the model name ('gpt-5.6-luna'), an array of choices each with an assistant message and finish_reason, and a usage object with prompt_tokens, completion_tokens, and total_tokens.
Example use cases
Agent routing decision helper
“Ask GPT-5.6 Luna to classify this user message into one of three intents — 'purchase', 'support', or 'information' — and return only the label: 'I can't find my order from last week.'”
Lightweight buyer triage answer
“Use the gpt-5.6-luna model to give a one-sentence answer to a potential customer asking 'Is this product compatible with macOS 14?' — keep it under 50 tokens.”
Context-grounded QA for a knowledge base
“Send this context snippet and question to GPT-5.6 Luna and get a concise answer: context is 'Our return policy allows returns within 30 days with receipt,' and the question is 'Can I return something I bought 3 weeks ago?'”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/chat/completions/gpt-5.6-luna?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, no-subscription LLM inference endpoint that accepts USDC micropayments via x402 and is OpenAI API-compatible, especially if your agent wallet supports x402 payment flows. It is well-suited for lightweight routing, extraction, short QA, and buyer triage tasks where per-request billing is preferred over a monthly API key subscription. Prefer alternatives (e.g. direct OpenAI API) when you need guaranteed model provenance, SLA, or longer context reliability.
Side effects
- Payment not included or insufficient USDC causes 402 Payment Required with a payment challenge
- Invalid or missing 'model' query parameter returns an error or falls back to default model
- Prompt or message too long exceeds max_tokens limit of 128000
- GET method limitations mean very long prompts may be truncated by URL length restrictions
- Unknown or unsupported model enum value causes rejection
- Rate limiting or quota exceeded on the upstream provider returns 429
- Domain or infrastructure outage on 558686.xyz returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "chatcmpl_example",
"model": "gpt-5.6-luna",
"usage": {
"total_tokens": 44,
"prompt_tokens": 32,
"completion_tokens": 12
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "A concise answer from GPT-5.5."
},
"finish_reason": "stop"
}
]
}
}Tags
x402
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