MULE ESB provides an API layer that offers a decoupled interface for interacting with applications in a common, language-agnostic way. Common uses of an API layer include connecting to legacy applications that lack REST APIs or publishing APIs for partners to communicate with systems through a well-defined interface. The Anypoint Platform enables API-led connectivity by helping users build, design, and manage APIs from a single platform to expose enterprise data and applications in a secure and controlled way.