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

femtum-sdk
0.13.3

This version was deleted from PyPI around 2025-06-21. Installing fails with:
$ pip3 install femtum-sdk==0.13.3 ERROR: Could not find a version that satisfies the requirement femtum-sdk==0.13.3
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==0.13.3
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-0.13.3-py3-none-any.whl (56.3KB)
femtum_sdk-0.13.3.tar.gz (105.1KB)