Here is the initial release of BIBOP (Bruno's IB Option Pricer) that uses the IB TWS API to retrieve realtime options quotations for either SPX, RUT or NDX underlying symbols. It is fairly self-explanatory in my view. Download link in later post below in this same thread. It is recommended to install the IB API (https://www.interactivebrokers.com/en/index.php?f=5041) to have the ActiveX (OCX) properly registered in Windows. Note: Content (i.e. macros) must be enabled. Feel free to scan for viruses. Dropdown lists are coded for most cells to prevent wrong entries. The General tab serves to Connect/Disconnect to the IB TWS. The Tickers tab has a few editable (green) cells (many are commented) to determine which option chains to load (Populate button) and to request data for. The workbook supports 2 expirations in yyyymmdd format. The Pricer page is a tool to calculate Mid and Mark prices for any combo (Put/Call on either expiration). Combo size can be increased and the number of combos is not limited (just copy/paste new combo tables below). The first row contains a column number used in a VLOOKUP formula to access data from the Tickers page so other information e.g. Theta, Gamma, Vega etc can be added. The IV page is only a IV curve chart for the time being. BIBOP is free to use and distribute among CD members (VBA code is protected though). There will be a more comprehensive version at a nominal fee. I hope you'll enjoy it !