So here's a new experiment: commits-count-git. It shows the commits count of a project without having to clone it.
This allows generating pkgvers without having to source the hole repository, making checking for AUR updates as fast as possible for a particular package.
Since the API is centralized in a single command, in case of change of spec of a web platform, you only have to modify it in a single place for all the packages being able to continue retrieving the count.
For the time being GitLab and GitHub are supported, although adding new platforms only takes a few lines in Bash.
In the first weeks this software shall be considered experimental and prone to changes. As long as constructive suggestions are welcome.