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.
The legendary boxer made the revelation to Kevin Hart on the latest episode of "Cold As Balls" -- saying if he agreed to a contract with the fight company ... he'd get PAID.
"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.