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

cxrandomwalk
0.1.3

This version was deleted from PyPI around 2024-10-24. Installing fails with:
$ pip3 install cxrandomwalk==0.1.3 ERROR: Could not find a version that satisfies the requirement cxrandomwalk==0.1.3