Since the user is already making use of ten market data lines (five in the TWS and another five in his client application), the TWS will respond with an error message telling the client application it has reached the maximum number of simultaneous requests. At a later point while all 10 requests are still active, the user tries to subscribe to the live real time market data of an eleventh product. When the user connects his TWS API client application to the TWS, he then requests the real time market data for another different five instruments. Market data lines therefore represent the active market data requests a user has.Įxample: To clarify this concept further, let us assume a user has a maxTicker Limit of ten market data lines and is already observing the real time data of say five stocks within the TWS itself. Whenever a user requests an instrument's real time (top-of-book) market data either from within the TWS or through the TWS API, the user is making use of a market data line. You are NOT logged in with your live user name at the same time on a different computer.You have shared the market data subscriptions accordingly as described above.Important: since your paper trading market data permissions are bound to your live one, you can only obtain live market data on your paper trading user if This will launch a browser window to the market data subscription page of a subscription covering the indicated instrument.Īlternatively, there is also a "Market Data Assistant" utility for determining market data subscriptions: One way to determine which market data subscriptions are required for a given security is to enter the contract into a TWS watchlist and the right-click on the contract to select "Launch Market Data Subscription Manager". Login to your Account Management, navigate to Manage Account -> Trade Configuration -> Market Data and select the relevant packages and/or subscription you wish to subscribe to based on the products you require. (3) market data subscriptions for the specified username (2) a funded account (except with forex and bonds), and (1) trading permissions for the specified instruments
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The full list of requirements for real time data: In order to receive real time top-of-book, depth-of-book, or historical market data from the API it is necessary have live market data subscriptions for the requested instruments in TWS.
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