Payment should be centered on how engaged one is across the spectrum of metrics that you offer. I'd offer a "light" first one for free and then require payment beyond that first metric.
Ask HN: check out our upcoming web stats dashboard app - MightyReach.com
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Re: Ask HN: check out our upcoming web stats dashboard app - MightyReach.com
#22doesn't seem like something people would spend money on...all of this info seems readily and easily accessible already.
the name seems a bit childish.