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About USPS Simple Shipping for Woocommerce
USPS Simple is a plugin for WooCommerce that integrates the US postal domestic service as a shipping method. It calculates real-time rates through the USPS API and can group items based on weight for easier calculations. It supports a wide range of USPS services for shipping.Screenshots

Changelog
1.10.11
- Tested with WooCommerce 9.6.
1.10.10
- Tested with WooCommerce 9.5.
1.10.9
- Tested with WordPress 6.7, WooCommerce 9.4.
1.10.8
- Tested with WooCommerce 9.3.
1.10.7
- Tested with WooCommerce 9.2.
1.10.6
- Trim the debug details on copy to make wp.org recognize it as a code fragment.
1.10.5
- Tested with WordPress 6.6, WooCommerce 9.1.
1.10.4
- Tested with WooCommerce 8.9, 9.0.
1.10.3
- Tested with WordPress 6.5, WooCommerce 8.8.
1.10.2
- Tested with WooCommerce 8.7.
1.10.1
- Tested with WooCommerce 8.4.
1.10.0
- Skip calculations if no zip code provided.
- Fix debug mode error on missing product dimensions.
1.9.4
- Tested with WordPress 6.4, WooCommerce 8.3.
- Raise the min required WooCommerce version to 5.0.
1.9.3
- Tested with WooCommerce 8.1.
1.9.2
- Tested with WordPress 6.3, WooCommerce 8.0.
1.9.1
- Fixed the default titles of the First-Class Mail Postcard services.
- Tested with WooCommerce 7.9.
1.9.0
- Replace First-Class Mail Parcel and Package with the new USPS Ground Advantage service (enabled by default).
- Tested with WooCommerce 7.8.
1.8.3
- Declare HPOS compatibility.
- Tested with WordPress 6.2, WooCommerce 7.7.
1.8.2
- Media Mail & Library Mail: always show the lowest of the rates to work around the USPS API inconsistency.
1.8.1
- Enable the plugin for Guam.
1.8.0
- Fix the Media Mail and Library Mail options not showing up since 22-Jan-2023 due to the USPS API updates.
- Tested with WooCommerce 7.3.
1.7.4
- Avoid ‘Non-numeric value encountered’ PHP warnings on missing product dimensions.
- Tested with WooCommerce 7.1.
- Raise the minimum required versions of WordPress and WooCommerce to 4.6 and 3.2 respectively.
1.7.3
- Tested with WooCommerce 7.0, WordPress 6.1.
1.7.2
- Tested with WooCommerce 6.9.
1.7.1
- Fix an error when item quantity is fractional.
1.7.0
- Workaround a USPS API error for items less than 0.25 inch.
- Check shipped items dimensions against the First-Class Mail size constraints (if ‘Quote regular items by weight’ is disabled).
- Avoid an additional call to the USPS API if Retail Ground is disabled.
- Fill the shipping origin postcode from Store Address by default.
- Enable the plugin upon install.
- Remove the ‘(USPS Simple)’ delivery option label suffix.
- Require PHP 7.2+.
- Tested with WooCommerce 6.7.
1.6.2
- Tested with WooCommerce 6.5, WordPress 6.0.
1.6.1
- Tested with WooCommerce 6.3.
1.6.0
- Add the ‘First-Class Package Service – Retail’ service.
- Small backend cosmetic changes.
1.5.7
- Avoid ‘Non-numeric value encountered’ PHP warnings on missing product dimensions or weight.
- Tested with WordPress 5.9, WooCommerce 6.1.
1.5.6
- Replace the default USPS API user id to fix the authorization issue.
- Tested with WooCommerce 5.6.
- Fix the debug info drawer won’t expand after cart update.
1.5.5
- Tested with WooCommerce 5.6.
1.5.4
- Tested with WordPress 5.8, WooCommerce 5.5.
1.5.3
- Tested with WooCommerce 5.3.
1.5.2
- Tested with WooCommerce 5.1, WordPress 5.7.
1.5.1
- Reword commercial rates description.
- Refactor USPS API response handling a bit.
1.5.0
- Check prerequisites on load, in a user-friendly way.
1.4.0
- Replace the deprecated WC_Product->length/width/height properties access with get_XXX() calls.
- Switch to the HTTPS USPS API endpoint.
- Disable cache and show debug data on the cart and checkout pages if the WooCommerce shipping debug mode is enabled.
- Tested with WooCommerce 4.8, WordPress 5.6.
1.3.1.1
- Tested with WooCommerce 4.7.
1.3.1
- Tested with WooCommerce 4.6.
- Minor changes for better USPS API response parsing.
1.3
- Tested with WordPress 5.5 and WooCommerce 4.5.
- Refresh the settings page look a bit.
1.2.6
- Compatible with woocommerce 2.6
1.2.5
- Fix First-Class Mail Parcel price calculator.
- Added First-Class Mail Large Envelope, Letter and Postcards.
1.2.4
- API Request updated
1.2.3
- Fix – Incorrect work of “Quote regular items by weight” with zero size items.
1.2.2
- Removed deprecated USPS services:
Priority Mail Regional Rate Box C;
Priority Mail Regional Rate Box C, Hold For Pickup; - Added First-Class Mail Metered Letter;
- Rebranding of Standard Post as Retail Ground.
1.2.1
- Fix – warning message in cart.
1.2.0
- Added services:
Priority Mail, Hold For Pickup;
Priority Mail Regional Rate Box A, Hold For Pickup;
Priority Mail Regional Rate Box B, Hold For Pickup;
Priority Mail Regional Rate Box C, Hold For Pickup.
1.1.1
- Added mail class id
1.1.0
- Added grouping by weight.
1.0.1
- Fix – Standard Post really works.
1.0
- Supported services: Priority Mail Express, Priority Mail, First-Class Mail, Standard Post, Media Mail, Library Mail