The best reported statistic on Dude Perfect's income, as of 2019, was about $20 million dollars, according to CNBC, but there's a catch to that: it's purely their YouTube viewing earnings. Now, that probably does make up the bulk of their revenue (it's their official job, after all), since the channel boasts nearly 50 million subscribers and average 7-8 million hits on their once-a-week videos. Those impressive numbers are only part of the picture, however.
That's because, as Naibuzz points out, Dude Perfect has entered into a number of endorsement deals and other branding opportunities, including the sale of their own merchandise. Those probably bring in more money than most people see in a lifetime, but probably still nets only in the single-digit millions. On top of that, the boys do have a television deal and had new episodes of The Dude Perfect Show airing on Nickelodeon through 2019. Though no fourth season has been confirmed, there's no reason to believe that deal won't be renewed eventually — 2020 has been a tough televised content year for everybody.
All together, these one-time branding endorsements, TV royalties, and one-time salaries for appearing on-screen in episodes could easily double that $20 million, but there's no way to know what the numbers are for certain. Regardless, it seems that doing basketball tricks and casually breaking Guinness World Records can bring quite a payday, if you're determined and bold enough to put it on the internet for all to see and judge.