NOTICE - Important USPS Code Changes  Action Required!  Secure Sockets Layer (SSL) Implemented for Web Tool APIs

After January 31, 2007, the http:// instances of impacted APIs shall no longer be accessible.

Please be advised the list of APIs impacted, as detailed in table below, are currently accessible under SSL and therefore you can begin calling these new instances immediately.  Your User ID and the API names are the same.

The USPS has implemented such changes to secure your personally-identifiable information (PII) data transmitted over the Internet.   

Impacted APIs