REST

MDN defines REST, representational state transfer, as design constraints that aim at efficient and reliable distributed systems, with a resource transferred through standard client and server interactions. MDN also says that HTTP APIs are often called REST APIs even when they do not follow every constraint, and that beginners can treat the phrase as an HTTP service callable with ordinary web tools. In this directory, a REST flag means the firm publishes an HTTP API of that kind. It does not mean the API has been checked against every REST constraint, and it does not mean the API is the FIX protocol. Whether a retail client can use it is a separate field on the broker record.