it is an open bittorrent tracker, that anyone can use freely.
To use this tracker, add the following address to your torrents:
udp://z.mercax.com:53/announce
Note that the tracker only supports UDP and IPv6, for performance reasons.
Usage of this tracker is completely open.
Whomever want contact me, oscar@mercax.com
¿Stats? yes, you need Firefox:
http://z.mercax.com:9091/stats