You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
synium was reported malicious
OSV:MAL-2025-192438 - Malicious code in synium (PyPI)

synium

This package was deleted from PyPI around 2025-12-12. Installing fails with:
$ pip3 install synium ERROR: Could not find a version that satisfies the requirement synium (from versions: none) ERROR: No matching distribution found for synium

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/2025-12-11/ \ synium
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Or, download files manually

Choose a version to see all deleted wheels and files. We only show versions that have been deleted on PyPI.
1.0.0
1.0.1
1.0.2