The USPS (United States Postal Service) provides both Domestic and International Price Calculator APIs. These allow users to quickly calculate postage rates for their domestic and international shipments online. The calculators cover a wide variety of shipping options and can return unique mailing restrictions and declaration form information for international shipments.
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The python-ship SDK by benweatherman allows developers to access common shipping APIs from their Python applications. The UPS API's ground shipping methods and the USPS API's rate query and delivery confirmation methods are almost complete. The FedEx API's methods will be added in the future, but have not yet been implemented.