Did you mean to short your affiliate links to make money or make money off url shorteners? If it's the first, I use goo.gl or bit.do for tracking my traffic, they work very good, especially google's (obviously). If you think stuff like adfly, I wouldn't recommend earning money with it. Many people will, when they see affiliate url shortener, avoid clicking on that link. You'll need loads of traffic to get at least some money and IMHO, that traffic can be directed and used far better towards more paying offers.