You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
walletdecoders was reported malicious
OSV:MAL-2024-10190 - Malicious code in walletdecoders (PyPI)

walletdecoders
1.5.1

This version was deleted from PyPI around 2024-09-23. Installing fails with:
$ pip3 install walletdecoders==1.5.1 ERROR: Could not find a version that satisfies the requirement walletdecoders==1.5.1
View other deleted versions of walletdecoders

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/2024-09-22/ \ walletdecoders==1.5.1
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Or, download files manually

And install manually via pip:
walletdecoders-1.5.1-py3-none-any.whl (5.0KB)
walletdecoders-1.5.1.tar.gz (4.8KB)