I have been creating a Rx wrapper for the IB API. Still at a early stage. I am looking for contributors in: Website Documentation Development The website is at: https://ibrx.codeplex.com/
This is using Reactive Extensions based on the IB's C# client (IB also have a C# client now - https://github.com/InteractiveBrokers/tws-api/tree/master/source/csharpclient) It is just a wrapper which pumps events into a Subject and send events from Subject to the IB API.