Floyd Mayweather says he could get a 10-FIGURE CHECK from the UFC … if he told Dana White he wanted a deal to fight in the octagon right now.

Yeah … that’s $1 BILLION. He was hanging with Kevin Hart while discussing this huge payday.

“I can go get a deal right now from the UFC. Probably 3-fight, 4-fight, billion-dollar deal if that’s what I wanted.”

[TMZ]