ChromBot X402 (hosted by EvalEngine on Vercel) is a small, developer-focused API offering a health-check ping endpoint and a public-sale notification/registration endpoint tied to the Chromia project. It's ideal for lightweight uptime monitoring, simple integration into demo landing pages or chatbots to notify users when public registration opens, and for testing API connectivity. The service is an evaluation-focused provider with a simple pricing model ($0.01/request) and limited endpoints.