Is it possible to retrieve relative performance percentage(as shown in graph screenshot below) data from Datastream api.
e.g if I pass two identifiers (Barclays and FTSE) and get time series data of relative percentage for last 2 years.
This forum is more for programming-type queries, rather than content queries. I would recommend you raise a content ticket to the Refinitiv Datastream Web Service support team to find instruments, data types, or expressions that can be used to retrieve the required data. After getting instruments, data types, or expressions, we can apply them to the DatastreamDSWS API.
You can directly contact the Refinitiv Datastream Web Service support team via MyRefinitiv.