According to their post on ET, Interactive Brokers is now offering additional streaming quotes at a cost of $30/mo per pack of 100 quotes, with a a maximum of 1100 quotes total. As before, the first 100 quotes are free (so long as you do a few trades per month).
Note that once you reach about 500 quotes, datafeed services like IQFeed become more cost effective (1000 realtime streaming quotes on IQFeed is around $140/mo, depending on the symbols you want to stream).
Historical quote vendors can be difficult to locate, as their services aren’t exactly mainstream. I’ve worked with few different datafeeds over the years and have done quite a bit of research on them. Here are the vendors that made my short list:
A system back test is only as good as the data upon which it is based, so access to clean and reliable historical quotes is paramount to the success of an any algorithmic trader. There are a number of datafeed providers out there offering a wide range of services, so choosing the best one to suit your needs can be a somewhat daunting task.
To assist you in selecting the best quote provider for your needs, here’s a few key points to consider: