Does anyone know if there exists an updateable torrent which lists other torrents? That is, a torrent using http://www.bittorrent.org/beps/bep_0046.html http:/

Does anyone know if there exists an updateable torrent which lists other torrents? That is, a torrent using http://www.bittorrent.org/beps/bep_0046.html http://www.bittorrent.org/beps/bep_0046.html to keep an up to date archive of magnet links or something? If not, does anyone if any of the major trackers offer an API to scrape all magnet links + tags? I don't want to take on the liability of publishing said tracker-torrent, but I can certainly write the software to make it easy.