开云体育

Hi,
I am trying to subscribe to market data using reqMktData for SPX option chain. When I subscribe to just one option contract, TWS is showing the subscription count as 2 (Alt+Ctrl+=).

Any idea why it is double counting?

Thanks

Solved it!

For options, Exchange has to be set as "SMART:CBOE". TWS then counts each reqMktData as one request. Using just "CBOE", TWS was counting it as two.