This may be interesting for some users of TWS (version 900 - latest release) "Receive Delayed Market Data Customers now have the option to receive delayed market data for exchanges and instruments for which they do not current hold market data subscriptions. The Market Data Request Error window, which displays when the user attempts to add a ticker without having subscribed to market data, now includes two checkboxes at the bottom of the window. Check Receive available delayed market data to use delayed data (if available) for the specific instrument. Additionally check Automatically receive delayed market data when available to use available delayed data automatically whenever you add a ticker to your trading page on an exchange for which you do not hold a market data subscription. The trading window highlights tickers that use delayed data in yellow for easy identification. To modify delayed data settings, in Global Configuration select Display then select Ticker Row. Click the Reset Delayed Market Data Subscription button and check or uncheck the above options to reflect your delayed data preferences."