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

composabl-api-dev
0.10.4

This version was deleted from PyPI around 2025-01-31. Installing fails with:
$ pip3 install composabl-api-dev==0.10.4 ERROR: Could not find a version that satisfies the requirement composabl-api-dev==0.10.4