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

baseapp-backend
0.0.51

This version was deleted from PyPI around 2026-03-31. Installing fails with:
$ pip3 install baseapp-backend==0.0.51 ERROR: Could not find a version that satisfies the requirement baseapp-backend==0.0.51
View other deleted versions of baseapp-backend

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/2026-03-30/ \ baseapp-backend==0.0.51
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Or, download files manually

And install manually via pip:
baseapp_backend-0.0.51-py3-none-any.whl (815.1KB)
baseapp_backend-0.0.51.tar.gz (759.8KB)