USPS have released details of their forthcoming API update due on 28th July 2013.
If you don’t update your Magento installation you will stop receiving USPS rates for most services other than Standard Post, Media Mail and Library Mail.
We know shipping. Understanding the diverse needs of any store's shipping concerns, whether large or small is a point of expertise for WSA. Deep in the API's of all major world-wide carriers WSA has emerged victorious with an impressive list of extensions sure to meet any shipping crisis simple, or complex with a perfect solution.