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GPT-5.6 Luna x402 Chat Completions (GET)
x402
GPT-5.6 Luna x402 Chat Completions (GET) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.099995/call, status down (last checked 2026-10-13).
Runs a single OpenAI-compatible chat completion request against the GPT-5.6 Luna model via a GET request, billed per-call in USDC via the x402 payment protocol.
Price / call$0.099995
Success—
StatusDown
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
Returns an OpenAI-compatible chat.completion JSON object containing the completion ID, model name, the assistant's message content, finish reason, and token usage breakdown (prompt, completion, total tokens).
Example use cases
One-off agent reasoning step
“I need a quick answer from GPT-5.6 Luna: summarize the key differences between REST and GraphQL in two sentences, max 150 tokens.”
Buyer triage routing decision
“Use GPT-5.6 Luna to classify this customer message as 'interested', 'not interested', or 'needs follow-up': 'Can you tell me more about your enterprise pricing?' — keep the response under 50 tokens.”
Lightweight context QA for a document
“Given this context: 'The x402 protocol enables per-request USDC payments without subscriptions.' — ask GPT-5.6 Luna: what is x402? Use system prompt 'Answer only from the provided context.' and limit to 100 tokens.”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/chat/completions/gpt-5.6-sol?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single, pay-per-call OpenAI-compatible chat completion billed in USDC via x402 micropayments, specifically on the GPT-5.6 Luna model tier, without committing to a subscription. It is best suited for lightweight agent reasoning, routing decisions, extraction helpers, and short-answer tasks where per-request cost transparency matters and you want GET-based access rather than a POST body.
Side effects
- Payment not received or insufficient USDC balance — 402 Payment Required
- Invalid or unsupported model enum value — 400 Bad Request
- Missing required prompt/input query parameter — 400 Bad Request
- max_tokens exceeds 128000 limit — 400 validation error
- Upstream model timeout or unavailability — 503 or 504 error
- Malformed query string parameters — 400 Bad Request
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-5.6 Luna."
},
"finish_reason": "stop"
}
]
}
}Tags
x402
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