The MarketDataStreamRequest object is used as an input to the StreamMarketData API. This API provides streaming access to market data, including Level 1, Level 2, or Tick data for a given symbol. You can also add additional symbols to the stream without needing to unsubscribe from the currently subscribed symbols.

MarketDataStreamRequest

Field Name	Data Type	Accepted Values/Examples
Advise	bool	If set to True, real-time updates from the server will be registered for
MarketDataLevel	string	Level1 or Level2
MarketSource	repeated string	A list of market sources to which the returned data should be restricted. If empty, all sources are included
RegionalExchangeIds	repeated string	Regional exchange ID
Request	bool	If set to True, a current snapshot of the data will be retrieved
RequestType	string	To add, remove, or change a symbol(s) subscription
Symbols	string	Valid ticker symbol (e.g., AAPL, IBM, VOD.LSE)
UserToken	string	A server generated GUID that is given as response to the client during the first login