Most of the shopping carts has the USPS, UPS, FedEx shipping rate API option available.You have to setup an account with the respective shipping carrier and use the account details to configure in the shopping cart and enable the shipping rate calculation.
USPS:
https://www.usps.com/business/web-tools-apis/distributor-guides.htm#_Toc423593911
https://www.usps.com/business/web-tools-apis/distributor-guides.htm
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