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For now, there are no limitations on the "basic" version but they say you can be denied access if there's high usage. The "pro" version is $20 per month. I'm using the hell out of it and cutting and pasting results into Google Docs for now.

I’ve had the “too busy” notification before. When that happens I just switch over to my phone and it usually works. Must not be too busy. I wouldn’t care about having to pay for subscriptions if crypto would just reach new ATHs already.