I guess there are two questions here. Does quantconnect make sense? Does tradier @ $1 make sense because you can also connect quantconnect to IB, but at the normal fee level. It looks like other people have answered the latter question - tradier probably not the way to go.
Quantconnect is basically a nice looking trade/research API, and a retail platform for a low latency connection.
On the API side the open source part is nice. Personally I would have liked to see it a a non proprietary language. This suggests the user base they're aiming at is relatively inexperienced. Me, I'm too old to learn another language. It's relatively easy to create libraries so people can hook in trading algo's writing java or python so it looks almost like pseudo code and is easy for non specialists to write.
If you're trading relatively slowly then you're essentially getting just a robust server to protect you from internet downtime or power failure at home. There are easier ways of doing just that (eg
ec2, which I haven't used myself but I know people who are happy with it).
For serious low latency traders there are obviously plenty of other things out there, eg
http://www.fixnetix.com/services/managed-services/ (same disclaimer applies).
So if I describe the user base that this product fills a precise niche for: relatively inexperienced people who want a nice API, don't want to have to learn a real programming language, and need a low latency connection.... it scares me a little.
GAT
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here.