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You're charging $3 per stamp w/o a plan and at best $1 per stamp with the intro plan?! Wow! It's cool that you're able to attract customers at those margins.

I'm a bit confused as to why your API customers are given better rates (I assume this is why you have lower margins with them). Why not use the regular rates and give an API key to every customer who wants one?

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Well, everyone does actually get the API key and is able to use it anytime they like -- I really need to do a better job of explaining the product, features, etc on the site. :)

For the API customers, I've ended up haggling deals with them to get them on board. In general, I give those guys the ability to prepay in larger amounts to get a better per-piece rate or postpay for "higher" rates (believe it or not, most of the higher volume API-only users prefer to postpay because it improves their cash flow situation).

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