Current Version: v2025-6-02 (release notes)
OpenCart Versions: 1.5.0.x - 4.1.0.x
To Purchase: Visit Clear Thinking or opencart.com
Improve the accuracy and control over your USPS rates! This extension uses the newest USPS REST API with OAuth 2.0. USPS Pro has all the features of Basic USPS as well the ability to retrieve rates for packages over 70 pounds, for multiple packages, for Flat Rate Boxes, and more. You can also make various adjustments to the weight, dimension, and cost calculations, enabling you to get more accurate rates for your store.
- Upload and go — modifies no core files.
- Take advantage of the built-in extension updater. All that's required is to enter your current license key and click "Update".
- Request USPS rates for multiple packages if the cart weight is over the 70 lb USPS limit.
- Choose to package each item (including multiple quantities) individually, or by using a 3D packing algorithm.
- Optionally use a set box size for the 3D packing algorithm, rather than have the algorithm determine the appropriate box size itself.
- Adjust the item dimensions, item weight, and/or box weight before the USPS request is made, as well as the final rates after the USPS rates are returned. You can choose to include insurance in the rate costs as well.
- Flat Rate Boxes and Envelopes are properly shown only if the calculated box size is within the dimension limits.
- Restrict when the extension is available based on store, geo zone, and customer group.
- Use the included Testing Mode when encountering issues, to help determine why things are not working on the front-end as expected.
