USPS package barcodes, service type codes and mailing terms, each cited to its USPS source.
Free
One server, in e-commerce. USPS package barcodes, service type codes and mailing terms, each cited to its USPS source.
E-commerce
USPS package barcodes, service type codes and mailing terms, each cited to its USPS source.
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.