# Capsule AI Quickstart
1) signup:   POST https://capxle.com/auth/signup        {"email":"...","password":"..."} -> api_key(atk_v2)
2) session:  POST https://capxle.com/auth/session       header X-API-Key -> cookie(900s)
3) whoami:   GET  https://capxle.com/auth/me            cookie -> {"authenticated":true}
4) Chat:     POST https://capxle.com/agent-api/chat     X-API-Key {"messages":[{"role":"user","content":"..."}]}
5) Agent:    POST https://capxle.com/agent/answer       X-API-Key {"query":"..."}
6) MCP:      POST https://capxle.com/mcp                Authorization: Bearer <key> (JSON-RPC: tools/list)
7) billing:  GET  https://capxle.com/billing/estimate   X-API-Key -> today's actual usage