Current Version: v2025-5-13 (release notes)
OpenCart Versions: 1.5.0.x - 4.1.0.x
To Purchase: Visit Clear Thinking or opencart.com
For Additional Features: Take a look at USPS Pro
The simplest and most user-friendly way to get USPS rates in OpenCart. This extension uses the newest USPS REST API with OAuth 2.0. You can choose which USPS services to offer and retitle them directly in the admin panel. Instructions are included within the extension for how to generate your USPS Consumer ID and Consumer Secret needed for the extension to work.
- 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".
- Sort the rates USPS returns based on name or price.
- Restrict when the extension is available based on store, geo zone, and customer group.
- Utilize both Test and Live request modes.
- Display rates using Retail costs or Commercial (i.e. online) costs.
- Set the box size, dimension units, and weight units used in the rate request. You can also add insurance or your own adjustment into the rate cost.
- Choose which USPS services to display to the customer, and retitle them to whatever you want.
- Use the included Testing Mode when encountering issues to help determine why things are not working on the front-end as expected.
