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GPT-5.5 Metered Chat Completions (GET, x402 Guarantee Deposit)
x402
GPT-5.5 Metered Chat Completions (GET, x402 Guarantee Deposit) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.523889/call, status unknown (last checked 2026-09-13).
GET-based OpenAI-compatible GPT-5.5 chat completions endpoint with usage-metered x402 pricing and a pre-payment guarantee deposit quote of $0.523889 USDC; unused deposit is credited back after actual usage is settled.
Price / call$0.523889
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, object type, model name, choices array containing the assistant's message, and a usage object detailing prompt/completion token counts. The $0.523889 USDC guarantee deposit is charged upfront; any unused portion is credited back to the caller's internal balance once upstream token usage is confirmed.
Example use cases
Example prompt
“Ask GPT-5.5 the following using metered x402 pricing — system prompt: 'You are a helpful assistant', message: 'Explain quantum entanglement in simple terms', max 500 tokens, and give me the $0.523889 guarantee deposit quote before we proceed.”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/chat/completions/meteredWhen to prefer
Choose this endpoint when you need GPT-5.5 chat completions via a GET request (useful for browser, curl, or agent environments that cannot easily POST JSON bodies), want usage-metered x402 micropayment billing with a transparent pre-payment deposit, and prefer discounted token rates (input $5/1M, cached $0.5/1M, output $30/1M multiplied by 0.111112) with automatic credit-back of unused deposit. Prefer over POST variants when query-parameter-based invocation is required.
Side effects
- Payment not provided or x402 payment header missing — returns 402 Payment Required
- Model parameter not set to 'gpt-5.5' — may return 400 Bad Request or route mismatch
- max_tokens exceeds 128000 — schema validation error
- No prompt/input/message query parameter provided — returns 400 missing required input
- Upstream OpenAI API unavailable — 502 or 503 proxy error
- Deposit insufficient for actual usage — may result in balance adjustment or partial response
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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