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

femtum-sdk
0.16.5

This version was deleted from PyPI around 2025-06-21. Installing fails with:
$ pip3 install femtum-sdk==0.16.5 ERROR: Could not find a version that satisfies the requirement femtum-sdk==0.16.5
View other deleted versions of femtum-sdk

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/2025-06-20/ \ femtum-sdk==0.16.5
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:
femtum_sdk-0.16.5-py3-none-any.whl (50.9KB)
femtum_sdk-0.16.5.tar.gz (86.7KB)