Bravo to transparency. Isn't this expensive though?
* http://blog.balancedpayments.com/volume-pricing/
* https://stripe.com/us/pricing
* https://www.braintreepayments.com/faq control-f pricing
TL;DR: Everyone has 2.9% + 30¢ on their page, Stripe mentions to email them for a discount if you're doing over $1MM/year.
$0 - $3,000/month 2.9% + $0.30
$3,000 - $10,000 2.5% + $0.30
$10,000 - $100,000 2.2% + $0.30
$100,000+ 1.9% or less, requires calling sales