adf.ly provides one of the best services in url shortening. They have good rates for publishers. Linkbucks is also top shortener. You can try new programs too, for example shorte.st, but I personally prefer well-established systems like adf.ly -> viewtopic.php?f=41&t=206
i think fas.li is the best, the interface is better,pay rates are better and there are useful tool available to increase revenue effectively and it is not blocked by ad blockers. i used ad.fly but now i think fas.li is better.