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Are your top customers really only paying you $97/month? Seems like you could charge them substantially more money.

Isn't that stretching it a bit too much? It's a service that can be replicated for free with the Yahoo! Finance APIs and a couple hours of your time.

Yahoo finance APIs are notoriously finicky. They go down. They change. Hard to build a business off that.

I can't say I can relate, I've been using them for two years without an issue.