# Services from api.xfuel.app on Zero

> api.xfuel.app serves 4 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/api.xfuel.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.xfuel.app/health.json

## Services

- [XFuel Chat Completions](https://www.zero.xyz/c/xfuel-chat-completions-3d4ba92c/llms.txt): $0.002/call via x402. OpenAI-compatible chat completions endpoint that charges $0.01 USDC per call via x402 protocol on Base or Solana mainnet and returns a signed receipt with a verify URL
- [XFuel Paid Inference via x402](https://www.zero.xyz/c/xfuel-paid-inference-via-x402-e240cf7e/llms.txt): $0.002/call via x402. Runs a paid AI inference task on Base mainnet USDC via the x402 payment protocol, returning a signed receipt and verification URL
- [Chit402 Responses — x402 Paid AI Inference with Receipt](https://www.zero.xyz/c/chit402-responses-x402-paid-ai-inference-with-receipt-94e6eb9e/llms.txt): $0.002/call via x402. Submits a paid AI inference task via x402 USDC micropayment on Base, returning a verifiable receipt with task ID and payment reference
- [XFuel A2A Message (OpenAI-Compatible Paid Inference)](https://www.zero.xyz/c/xfuel-a2a-message-openai-compatible-paid-inference-4a39f90f/llms.txt): $0.002/call via x402. Accepts an OpenAI-style chat completion request over an agent-to-agent message endpoint, processing it via x402 USDC micropayment on Base or Solana mainnet and returning an AI-generated text response with a signed payment receipt.

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)