Namespace for continuation-based runtime. Some embodiments described herein are directed to a framework using continuation based runtime namespaces that pertain to an infrastructure for enabling the creation of a wide variety of continuation-based programs that perform a wide-array of tasks. The infrastructure provides a foundation for building continuation-based, declarative applications of various scale and complexity. In some embodiments, the associated application programming interfaces (APIs) are factored into a hierarchy of namespaces in a manner that balances utility, usability, extensibility, and versionability.