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RedBTC GPT-5.4-mini Chat (Fixed-Price)
x402
RedBTC GPT-5.4-mini Chat (Fixed-Price) is a paid API for AI agents from redbtco.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Sends a chat message to a fixed gpt-5.4-mini model via a pay-per-call USDC route with no API key required, capped at 600 tokens for safe autonomous agent use.
Price / call$0.001
Success—
StatusUnknown
How this service works
Cheapest RedBTC agent chat route. Fixed gpt-5.4-mini, no API key, USDC per call, hard capped for safe autonomous use.
Output
A text completion from the gpt-5.4-mini model, returned as an assistant message. The response is capped at a maximum of 600 tokens and is billed at $0.001 USDC per call via the x402 payment protocol.
Example use cases
Autonomous agent quick Q&A
“Ask the RedBTC gpt-5.4-mini model — with a 150-token limit — 'What is the capital of France and why is it historically significant?'”
Low-cost content summarization
“Use the cheapest RedBTC chat route to summarize this paragraph in 100 tokens or fewer: 'Photosynthesis is the process by which green plants convert sunlight into chemical energy stored as glucose.'”
Agent pipeline decision step
“Call the RedBTC gpt-5.4-mini chat endpoint and ask it, with temperature 0: 'Given the following list of tasks, which should I prioritize first: send invoice, schedule meeting, or reply to client?' Keep the reply under 80 tokens.”
Technical details
Endpoint
POSThttps://redbtco.com/x402/redbtc/chat/5.4-mini?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need the lowest-cost AI chat completions without managing an OpenAI API key, especially in autonomous agent pipelines where per-call USDC billing and a hard 600-token cap provide cost safety. Prefer it over the sibling gpt-5.5 route when response quality requirements are moderate and minimizing spend is the priority.
Side effects
- Payment failure if USDC balance is insufficient for the $0.001 per-call fee
- Request rejected if messages array is empty or missing required role/content fields
- Response truncated if max_tokens is set very low relative to prompt complexity
- Rate limiting or hard cap enforcement if token ceiling is exceeded
- Unpredictable output if temperature is set to extreme values (0 or 2)
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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