The unbeaten 'Money' will square off against the South American once again on September 13, and he believes that he will see off the threat of Maidana for the second time in Las Vegas.
Speaking at a promotional event in New York, Mayweather, who was personally addressing Maidana, said: "However much you're making for the fight, I'll bet you I'll beat you.
"That's how much I believe in myself because I can afford to give up whatever.
"So if you believe in your skills like you say you believe in your skills, however much you're making for the fight, I'll bet I beat you."
Mayweather is expected to earn around £41m for the clash with Maidana.