I can already get the price for IBM on a given date :
https://www.quandl.com/api/v1/datasets/GOOG/NYSE_IBM.json?trim_start=2012-11-01&trim_end=2012-11-01
Is there a way to query Quandl a single time and for multiple tickers ( all the same date)?
Update 2 : I wrote to Quandl and as of 2015-04-07, the multiset querying feature is removed. They are planning to reintroduce it in "a couple of months".
Update : The C# library is deprecated and the multi-set route it used is no longer valid :( I did not solve my problem yet
Well I found my answer on the libraries page of the Quandl website
http://quandl.com/help/libraries
The one that helped me is for C# : https://github.com/HubertJ/QuandlCS
and is providing the source code for how to construct a multiset
query, which is what I needed, it seems.