Me too. It was working just the other day, today, it does not. On July 18th, we got this email below. Today, the 28th, it is not working. They don't give a fix. ANd, my log in doesn't work either for USPS . What did you do?


USPS will release updates to the Web Tools APIs on 28 July 2013. The staging environment is currently open for testing your updated applications. You may review staging information and the release notes at the USPS Web Tools site here for more details.

If you rely upon a third-party developer (e.g. software or ecommerce/cart provider) for USPS products and services on your website or your shipping application, please direct any application-specific questions to them.