Ask HN: Who are you using for stock market data in your app?

Collecting stock market data directly seems to mean trawling through dozens of exchanges and doing one-off implementations of their feeds. Some companies try and wrap this up for enterprise-tier customers (http://www.interactivedata.com being one). Google Finance's API was deprecated May 26. Yahoo has a method for accessing CSVs of this data programatically, but it's undocumented. Is anyone serving startups or smaller shops with an API for retrieving stock trading data? Does HN have any experience integrating with this type of data?