Sum your charges

gistfile1.txt

Stripe.api_key = # your API key
nextCharges = Stripe::Charge.all(:limit => 100)
data = nextCharges.data

while nextCharges.has_more do
  nextCharges = Stripe::Charge.all(:limit => 100, :starting_after => data[data.length - 1].id)
  data = data + nextCharges.data
end
data.inject(0) {| sum, nextCharge | sum + nextCharge.amount }