I have found success using this URL:
https://onlinetools.ups.com/ups.app/xml/Rate
IF this is the proper solution all users of the Cart will need to update their files. Please test and confirm.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.