You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
msgspec-python313-pre was reported malicious
OSV:MAL-2025-2977 - Malicious code in msgspec-python313-pre (PyPI)

msgspec-python313-pre

This package was deleted from PyPI around 2024-12-30. Installing fails with:
$ pip3 install msgspec-python313-pre ERROR: Could not find a version that satisfies the requirement msgspec-python313-pre (from versions: none) ERROR: No matching distribution found for msgspec-python313-pre

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2024-12-29/ \ msgspec-python313-pre
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