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GPT-5.6 Luna x402 Chat Completions (GET variant)
x402
GPT-5.6 Luna x402 Chat Completions (GET variant) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.049998/call, status down (last checked 2026-10-13).
Generates OpenAI-compatible chat completions using the GPT-5.6-terra/luna model via a GET request, paid per-call with USDC over x402.
Price / call$0.049998
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-style JSON chat completion object containing a choices array with the assistant's message content, finish reason, model name, completion ID, and token usage stats (prompt, completion, total tokens).
Example use cases
One-shot QA for routing agent
“Use the gpt-5.6-luna model to answer this question in under 150 tokens: 'What is the capital of Australia?' — pay per call, no subscription needed.”
Extraction helper for pipeline
“Send this text to GPT-5.6-terra and ask it to extract the key named entities: 'Apple Inc. CEO Tim Cook announced record Q2 earnings in Cupertino on Tuesday.' Keep the response under 300 tokens.”
Short content generation task
“Have GPT-5.6 Luna write a two-sentence product tagline for a reusable water bottle brand called HydraFlow, using the gpt-5.6-terra model, max 100 tokens.”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/chat/completions/gpt-5.6-terra?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, subscription-free LLM completion using x402 USDC micropayments on Base, especially in agent pipelines or browser-wallet contexts where you want to avoid API key management. Prefer it over standard OpenAI direct access when per-request billing in crypto is required, or when you need OpenAI-compatible output format with the gpt-5.6-luna/terra model tier specifically.
Side effects
- Payment not included or insufficient USDC — returns 402 Payment Required
- Invalid or unsupported model enum value — returns 400 Bad Request
- Missing required 'input' or 'prompt' query parameter — returns 400
- Upstream model provider unavailable — returns 502 or 503
- max_tokens exceeds 128000 limit — validation error
- Rate limit or quota exceeded — returns 429
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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