This is great. I love the simple, succinct interface — I wish real financial companies like my trading account and my bank had even half this much sense when it comes to pragmatic design.<p>A few notes from taking a look at the code:<p>* I've very much started doing the same thing in my projects of just using modern JavaScript constructs like fetch and arrow functions without a transpiler. IE is never going to support any of them, but I've accepted that. Caniuse.com ranks most of them at 85%+ supported.<p>* It's neat to see that the IEX API supports batch requests (as opposed to having to pull one stock at a time) in its API which makes it possible to implement the project efficiently and in a way that doesn't have to store state.<p>* Nice work building it to support large users as well. A lot of installations probably won't have more than 100 stocks, but it'll break up requests into multiple batches of <= 100 if they do.