JavaScript powers the modern Web. From small UI details like asynchronous content loading and form validation to the fundamental architecture behind Single Page Apps, almost all Web sites rely on JavaScript. With the addition of WebAssembly, other languages can now be compiled to run in browsers enabling high-performance use cases. So why is that power missing from our APIs? This talk is an introduction to a new HyperMap, a new REST standard which enables code to be executed on the client, examples of problems it solves, and how you can adopt it.