This shipping extension is a csv based solution that will lookup via the UPS API the zone a zipcode belongs to then filter based on the delivery types (e.g. Ground) and zone codes returned.
The advantage of this over say Matrixrate is that the size of the csv file is likely to be greatly reduced.
The diagram below shows in brief how the extension works by first retrieving the zone from USPS, then looking up this zone in the shipping table.
The csv file will also allow you to filter based on price, weight, #items or price & weight combined.
The following additional capabilities are present within this extension:
To successfully use this extension, you must be registered with USPS Webtools.
Head over to our landing page for USPS Zone Based Tablerates today !