RAP includes a Publisher API library which is used by feed handlers to format incoming market data and send the data to subscribers using UDP multicasting.
Intended as a tool for developers, the Publisher API can be used to develop custom feed handlers.
Publishers accept incoming market data messages and send those messages into RAP. RAP Data Stream (RDS) templates describing the message formats are used by the Publisher API to format the messages into packets. The Publisher API then sends the packets across data streams to subscribers.