Very impressed at net cost. I used to run a small ecom business targeting total prices in the range of $3-10. At $3, payment processing is nearly 11-12% of costs, which is absurd, more if you amortize the occasional chargeback/fraud. Lightning can do it for <<0.1% net cost even at the low end, which is incredible. There are plenty of these kinds of vendors on eBay, Aliexpress etc that would be willing to adopt with a bit of help.
For whoever posted, your cost calculator should be first thing on the page, and you "How we calculated this number" link is broken