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50 Cent, Floyd Mayweather, Jr.

Isaac Brekken/Getty Images

Floyd Mayweather's response to rapper 50 Cent is so money.

The hip-hop star had on Thursday shared a video showing himself forgoing the now-viral ALS Ice Bucket Challenge, taken by scores of celebrities, and issuing a new one—he said if the boxing champion would read one page from a Harry Potter book, he would donate $750,000 to charity.

On Saturday, Mayweather posted a photo of two checks that would probably not be accepted as a mobile deposit.

"Read this $72,276,000.00. God bless," he said.

"I guess you want people to see your math is better then your reading," 50 Cent tweeted in response to the photo.

He also posted an expletive-filled video posted on his Instagram page (warning: strong language).

"You put up a check. That must be for a blogger. You know I got money," he said.

Mayweather is the highest-paid athlete in the world, according to Forbes. The outlet reported in June that the boxer, whose matches are broadcast as pay-per-view events and on the premium cable channel Showtime, earned at least $105 million over the past year.

Mayweather had himself been nominated to himself undergo the Ice Bucket Challenge, aimed at raising awareness for amyotrophic lateral sclerosis, or Lou Gehrig's disease. He was challenged by illusionist Criss Angel and the boxer retweeted the request on his Twitter page on Wednesday.