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RedBTC GPT-5.5 Fixed-Price Chat
x402
RedBTC GPT-5.5 Fixed-Price Chat is a paid API for AI agents from redbtco.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).
Provides a fixed-model GPT-5.5 chat completion endpoint billed at $0.002 USDC per call with no API key required, capped at 700 tokens output for safe autonomous agent use.
Price / call$0.002
Success—
StatusUnknown
How this service works
Low-cost RedBTC strong chat route. Fixed gpt-5.5, no API key, USDC per call, hard capped for safe autonomous use.
Output
Returns an OpenAI-compatible chat completion object containing the assistant's generated text, capped at a maximum of 700 output tokens. The model is always GPT-5.5 regardless of any model parameter passed. Each call deducts $0.002 USDC via x402 payment.
Example use cases
Autonomous agent decision-making assistant
“I need you to use the RedBTC GPT-5.5 chat to evaluate the following two options for my project and give me a concise recommendation in under 300 tokens — no API key needed, just pay per call.”
Low-cost content drafting in pipeline
“Draft a short product description for a noise-cancelling headphone called AuraSound Pro using the RedBTC GPT-5.5 model, keeping the output under 200 tokens, with temperature set to 0.7.”
Agent safety-gated Q&A with token cap
“Send this customer question to the RedBTC GPT-5.5 endpoint: 'What is the return policy for electronics?' — cap the reply at 150 tokens so it stays short and safe for the automated support flow.”
Technical details
Endpoint
POSThttps://redbtco.com/x402/redbtc/chat/5.5?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a strong GPT-5.5 model response with predictable per-call USDC billing and no OpenAI API key management, especially in autonomous agent pipelines that require hard output token caps for safety. Prefer it over the sibling gpt-5.4-mini route when output quality matters more than cost minimization. Use it over direct OpenAI access when you want x402 micropayment billing without credential management.
Side effects
- Insufficient USDC balance or failed x402 payment returns a 402 Payment Required error
- Exceeding max_tokens limit of 700 returns a validation error
- Empty or malformed messages array returns a 400 Bad Request
- Upstream GPT-5.5 model unavailability may cause 503 or timeout errors
- Passing model parameter with a different model name is silently overridden to gpt-5.5
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Optional. RedBTC forces gpt-5.6-luna on this fixed-price route. |
| messages | array | |
| max_tokens | integer | |
| temperature | number |
Tags
x402
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