x402 (x402-ja3jqzfon-ethannisers.vercel.app) provides a compact set of protected math utility endpoints — a random-number generator and a simple addition endpoint — hosted on Vercel for serverless use. It’s designed for developers who need low-cost, authenticated math primitives for prototyping, testing, lightweight backends, or embedding into microservices (price range $0.05–$0.10).