Server402 XIAO Paid API Marketplace

Agent Workflow

1. Read /.well-known/server402.json or /llms.txt.
2. Search /api/catalog/search?q=your-task.
3. Inspect inputSchema, outputSchema, examples, pricing, and quality.
4. Call the API once to receive 402 Payment Required.
5. Open xiaopay.top to obtain XIAO, create the guarantee, then retry with X-Payment-Token, X402-Guarantee, or MCP paymentToken.

Discovery Formats

• OpenAPI 3.1 operations for importers and tool builders.
• MCP Streamable HTTP tools for agent runtimes.
• XIAO Bazaar metadata in payment-required responses.
• Robots, sitemap, and llms.txt for crawlers and LLM context.