A 7 day trial (if you need more than 7 days just ask your sales rep to extend your trial) is available on both IQFeed and DTN.IQ subscriptions which are compatible with most of the major 3rd party applications such as Tradestation, Ensign, QuoteTracker, InvestorRT, OmniTrader/VisualTrader, Wave59, AmiBroker, IQXP, Trading Solutions, Fibonacci Trader, Pro Trading Systems, Wealth Lab, Market Delta, NeoTicker, etc.
(we are working on a new website which will include a catalog of all compatible 3rd party apps)
After the trial, a subscription would run between $20/month (monthly price for a RT equities and delayed futures feed for DDE linking or QuoteTracker) to $45/mo (paid annually for DTN.IQ or other 3rd party software with RT equities, RT futures, and RT options).
Jay