You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
telnyx was reported malicious
OSV:MAL-2026-2254 - Malicious code in telnyx (PyPI)

telnyx
4.13.1

This version was deleted from PyPI around 2026-03-27. Installing fails with:
$ pip3 install telnyx==4.13.1 ERROR: Could not find a version that satisfies the requirement telnyx==4.13.1
View other deleted versions of telnyx

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/2026-03-26/ \ telnyx==4.13.1
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
telnyx-4.13.1-py3-none-any.whl (1.9MB)
telnyx-4.13.1.tar.gz (989.0KB)