You can access 13377x proxy sites through various mirror and alternative sites. One popular option is the website 1337x. They offer a wide range of torrent files and magnet links for peer-to-peer file sharing. If the main domain 1337x is blocked in your country, you can try using alternative domains like 1377x.to or 1337xx.to to gain full access. Another source, The Run Time, provides a list of 13377x proxy and mirror sites that you can use effectively for the same purpose