This API provides Domestic USPS product pricing based on the characteristics of what is being shipped for Parcel Select, Parcel Select Lightweight, Priority Mail, Priority Mail Express, USPS Ground Advantage, Library Mail, Media Mail, and Bound Printed Matter. Given inputs, such as origin and destination ZIP Codes, package weight and dimensions, processing category, destination rate indicator, price type, and desired Mail Class and Extra Services, this API will return the price of postage.