ActiveShipping Shipping Estimate Isn't Matching UPS Shipping Estimates

[Tim W]

Hi All,

I'm using ActiveShipping in an e-commerce app I'm working on. On the shopping cart page of the app I'm doing a quick estimate for the user based on a city, state, and zip for the origin and the users' destination zip. I'm finding that the results coming back from ActiveShipping are a few dollars cheaper than the real rates provided by UPS. My first thought was that it may be because UPS is interpreting the destination as a commercial address so I stipulated in the destination location object ":address_type => 'residential'" which hasn't helped at all.

Has anyone come across any instances where ActiveShipping differs from the rates provided by UPS's shipping estimate calculator? If so, are there any common pitfalls or mistakes that may cause someone using ActiveShipping to not get the right thing?

Thanks for anyone's help!

Best,

Tim