"I think it's gonna be like $50,000," White tells TMZ Sports.
Of course, the whole thing came about after Nate Diaz defeated Anthony Pettis in August and, during a post-fight interview, declared himself the 'BMF' champion of the world.
"We're fighting for the baddest mother f**ker in the game belt and that's mine," Diaz said after the Pettis fight ... "So, I'd like to defend it against Jorge Masvidal."
White liked the idea and the UFC is running with it -- in fact, White says Dwayne "The Rock" Johnson has already agreed to present the belt to the winner of the fight on November 2 at UFC 244, which will be held at Madison Square Garden in New York City!!!
"If The Rock wants to do it, The Rock gets what the Rock wants!!!"