Вот по SES например
2 000 messages per month x 0,0001 USD = 0,20 USD (Messages sent from email client cost)
5 GB per month x 0,12 USD = 0,60 USD (Email client data cost)
0,20 USD + 0,60 USD = 0,80 USD (SES usage cost)
SES usage cost (monthly): 0.80 USD