app-package-archive
PyPI
The Python community's package index, holding every published version of each package along with structured metadata. You can search on the website, and its keyless JSON API lets our search pull package details directly. Useful for software archaeology: retrieving an old release of a library or checking a package's version history.
Software / packages API
Why it’s useful & how it works
Niche/link-catalogue tier (see product-concept): surfaced as a described link to its search form. Probe verdict recorded for liveness.
API access
https://pypi.org/pypi/ <pkg>/json (keyless)
Access
Programmatic API access (a key may be required — see the API tag).