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GPT-5.5 Paid Chat via x402 USDC (Compact GET)
x402
GPT-5.5 Paid Chat via x402 USDC (Compact GET) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.110876/call, status unknown (last checked 2026-09-13).
Provides low-cost OpenAI-compatible GPT-5.5 chat completions via a GET endpoint, paid with USDC on Base via x402 protocol, supporting summarization, translation, QA, and coding help.
Price / call$0.110876
Success—
StatusUnknown
How this service works
Low-cost OpenAI-compatible GPT-5.5 paid chat over x402 Base USDC. Directory-friendly GET endpoint for compact agent responses, summarization, translation, QA, coding help, and GPT-5.5 chat completions without API-key onboarding. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call, while this gateway advertises a $0.110876 compact GPT-5.5 entry request, $0.110876 long-output GPT-5.5 requests, and $0.523889 true max-output GPT-5.5 requests. Pay up to $0.110876 per request with x402 USDC on Base. Exact fixed-price payment and upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Public paid calls are limited to 700000 input characters and 4096 output tokens.
Output
Returns an OpenAI-compatible JSON response with an id, model name, choices array containing the generated text, and a usage object showing token counts. The response reflects actual GPT-5.5 output for the given prompt, with billing settled via x402 USDC on Base based on actual usage up to the $0.004 cap.
Example use cases
Example prompt
“Summarize the following article in 3 bullet points using GPT-5.5: 'Quantum computing researchers have achieved a new milestone in error correction, reducing qubit decoherence by 40% using a novel topological approach.' Keep the response under 200 tokens.”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/paid/chatWhen to prefer
Choose this endpoint when you need low-cost, keyless GPT-5.5 completions paid per-use via x402 USDC on Base — ideal for agents that need compact AI responses (summarization, QA, translation, coding) without OpenAI API key onboarding, and where per-call costs under $0.004 are acceptable. Prefer over OpenAI direct when avoiding key management or when integrating micropayment-native AI into autonomous agent workflows.
Side effects
- Insufficient USDC payment: returns 402 Payment Required if x402 payment is missing or below minimum
- Prompt too long: returns error if input exceeds 700,000 characters
- max_tokens out of range: returns validation error if value is below 1 or above 4096
- Model unavailability: upstream GPT-5.5 outage may return 503 or timeout
- Malformed query params: missing required 'q', 'prompt', or 'message' field returns 400
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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