Dailymail says the former Prime Minister gave a talk about the implications of Britain's historic vote to leave the EU to Wall Street financiers last week.
He was paid more than £120,000, which is almost as much as the £143,462 he earned in a whole year as PM.
Given that the talk to Blackstone Properties in New York is said to have lasted little more than an hour, his pay would work out at £2,000 a minute.
If Cameron, 50, continues that rate of earning, he could soon rival moneybags Tony Blair, who quit the House of Commons when he was four years older. Blair has gone on to make an estimated fortune of £27 million.
It's not known who arranged for Cameron to give the talk.