This is (yet another) CPAN metadata database that provides REST API for the CPAN distributions, intended to be used by CPAN clients such as cpanminus. Currently the only implemented endpoint is the resolver to get distribution file names from package names (a.k.a
02packages.details.txt.gz) but there's a plan to implement more to extract information from
META.yml etc. See also CPANDB and CPANIDX for the similar works.