You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
vcdiff-py was reported malicious
OSV:MAL-2025-47811 - Malicious code in vcdiff-py (PyPI)

vcdiff-py

This package was deleted from PyPI around 2025-08-22. Installing fails with:
$ pip3 install vcdiff-py ERROR: Could not find a version that satisfies the requirement vcdiff-py (from versions: none) ERROR: No matching distribution found for vcdiff-py

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2025-08-21/ \ vcdiff-py
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2.1.0