Mayweather was outside the NBA Los Angeles Lakers vs Milwaukee Bucks game to a group of children selling candy in cash in a $100 note each.
The American boxer became the highest-paid boxer in history with a perfect 50-0 record, earning a 9-figure salary against Manny Pacquiao and Connor McGregor.
Mayweather said at the scene: "People here will ask for my signature and then they will sell it online and make money, I just want to give back to the kids." Kids out selling candy, they didn't do anything wrong, give me a few bucks and I'll give them. The NBA watched the Bucks beat the Lakers 131-116.
Mayweather also promised to repeat the process to the children every time they saw them, give them $100 every time they saw them, and didn't ask them for candy.
By the time Mayweather completed his act of generosity, the children selling candy had already made about $400.
Mayweather's kindness was well received by fans, with someone writing on personal social media: "Thank you very much for your generosity and wish him and his family better and better." "I like the way Mayweather helps people, he loves inspiring people and helping people."