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GPT-5.5 Chat Completions via GET (gpt55.558686.xyz)
x402
GPT-5.5 Chat Completions via GET (gpt55.558686.xyz) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.019999/call, status unknown (last checked 2026-09-14).
Generates GPT-5.5 chat completions via a GET request with query parameters, optimized for strong reasoning, production work, code, and structured responses, paid via x402 USDC on Base.
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
Returns an OpenAI-compatible chat completion object with an id, model name, choices array containing the generated text, and usage statistics including input/output token counts.
Example use cases
Example prompt
“Ask GPT-5.5 to review this Python function and suggest production-ready improvements, keeping the response under 500 tokens: 'def fetch_user(id): return db.query(User).filter(User.id == id).first()'”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/chat/completions/gpt-5.5When to prefer
Prefer this endpoint when you need strong reasoning, code generation, or structured output from GPT-5.5 via a simple GET request with query parameters, and are willing to pay up to $0.091 USDC per call via x402 on Base. Choose this over cheaper sibling endpoints when task complexity demands the full GPT-5.5 model tier rather than mini or codex variants.
Side effects
- Missing required 'input' query parameter returns a 400 error
- Prompt exceeds 700,000 character limit causing rejection
- max_tokens exceeds 2048 ceiling causing validation error
- Insufficient USDC balance or invalid x402 payment header causes 402 Payment Required
- Invalid model enum value causes a schema validation error
- Rate limiting or upstream GPT-5.5 unavailability returns a 503 error
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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