You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
pychatz was reported malicious
OSV:MAL-2026-2291 - Malicious code in pychatz (PyPI)

pychatz

This package was deleted from PyPI around 2026-03-31. Installing fails with:
$ pip3 install pychatz ERROR: Could not find a version that satisfies the requirement pychatz (from versions: none) ERROR: No matching distribution found for pychatz

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-03-30/ \ pychatz
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Or, download files manually

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1.0.0
1.0.1