This is actually one of the very few things that has bothered me about Stripe – they don't make their volume pricing public (Amazon does, now Balanced does). We've had to email when we hit larger sums to get pricing reduced.<p>Edit: although to be fair, I asked them about this, and they said their processing costs vary user to user, so they don't have a simple matrix (rather, they apply discounts based on the costs associated with an account). That's probably the best possible answer short of a pricing matrix...