You can use the CacheControl object to pull L1 market data from REDI's back-end. The list of available fields is in Appendix A REDI Data Fields in the REDI API Specification.

However, I couldn't find the "Indicative Opening Auction Price" and "Indicative Opening Auction Volume" in the list.

The following code demonstrates how to pull bid price for IBM.

CacheControl orderCache = new CacheControl();

object BidPrice = null;

object exec_err = null;

orderCache.Submit("L1", "true", ref exec_err);

orderCache.GetL1Value("IBM", "Bid", ref BidPrice);

Console.WriteLine(BidPrice.ToString());

Can you pull the "Indicative Opening Auction Price" and "Indicative Opening Auction Volume" from the REDIPlus UI?