# Services from redbtco.com on Zero

> redbtco.com serves 3 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/redbtco.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/redbtco.com/health.json

## Services

- [RedBTC GPT-5.5 Fixed-Price Chat](https://www.zero.xyz/c/redbtc-gpt-5-5-fixed-price-chat-84909c27/llms.txt): $0.002/call via x402. 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.
- [RedBTC Models List](https://www.zero.xyz/c/redbtc-models-list-b4a91256/llms.txt): $0.001/call via x402. Lists the two available RedBTC fixed-price AI chat models (redbtc/gpt-5.5 and redbtc/gpt-5.4-mini) for selection before routing a chat request.
- [RedBTC GPT-5.4-mini Chat (Fixed-Price)](https://www.zero.xyz/c/redbtc-gpt-5-4-mini-chat-fixed-price-2578d3aa/llms.txt): $0.001/call via x402. 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.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)