# X0 Start Public API > Empower your AI agent to integrate with X0 Start sites. ## Overview The X0 Start Public API allows you to programmatically interact with user sites hosted on the X0 Start platform. You can: - **Subscribe users** to waitlists or newsletters. - **Submit feedack** from users. - **Chat** with the site's AI assistant. - **Fetch and submit reviews**. All API requests require an `X-Site-Token` header. ## Authentication All endpoints require the `X-Site-Token` header. Example: `X-Site-Token: your_site_token_here` ## Resources - [OpenAPI Specification](/openapi.yaml) - Full machine-readable API definition. - [Human Documentation](/api-docs) - Interactive documentation for developers. ## Usage Examples ### Subscribe a User POST /api/v1/subscribe Content-Type: application/json X-Site-Token: YOUR_TOKEN { "email": "user@example.com", "type": "waitlist" } ### Submit Feedback POST /api/v1/feedback Content-Type: application/json X-Site-Token: YOUR_TOKEN { "feedback": "Great service!", "email": "user@example.com" }