USPS API - ColdFusion
You must have a username & password to use the USPS API. There are certain functions that may require only using the 'live' url (tracking), or SSL.
Taken from the USPS developer web tools email
Developers integrating Web Tools into a custom application: The following are the production URLs you will use to access the Web Tools Servers:
Step-by-Step Instructions for All USPS Web Tools (important information when getting started):
API User’s Guides (API specific technical/integration information):
USPS Web Tools website: (contains all these resources and more):