Connect with the US Postal Service live for domestic shipping cost using weight and zip codes.

Version 1.2 Update:

• Updated to use the USPS V4 Rate API

Be sure to register with the US Postal Service at https://secure.shippingapis.com/registration and obtain a USPS user name. Then, log in to your USPS account and request that you be switched over to the Production Server: be sure to tell them that a “Third Party Developer” has already tested the code!

Admin panel: