Conor McGregor is guaranteed a sum of $30m from his debut fight against Floyd Mayweather while the later gets a sum guaranteed $100million from the big fight.
The Irishman takes on Mayweather in Las Vegas in the wee hours of Sunday morning with the hope of putting a dent to his 50th professional fight.
Both fighters will see their earnings increase after pay-per-view sales are taken into account.
McGregor was seen roaring loudly after he sets in to check his weight-in ahead of the fight.
Mirror Sport reported that The fight could set a new Pay-Per-View record, beating the previous one of 4.6m set when Mayweather fought Manny Pacquiao two years ago.