You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

carrier.usps
2021.3

This version was deleted from PyPI around 2025-07-09. Installing fails with:
$ pip3 install carrier.usps==2021.3 ERROR: Could not find a version that satisfies the requirement carrier.usps==2021.3
View other deleted versions of carrier.usps

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-07-08/ \ carrier.usps==2021.3
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
carrier.usps-2021.3-py3-none-any.whl (722.4KB)