Greenspan will be represented by the Alexandria, Virginia-based Washington Speakers Bureau, the newspaper said, citing "sources in the U.S. event management industry."
The Washington Speakers Bureau, which handles bookings for high-profile figures like former Secretary of State Colin Powell, did not return phone calls while Fed officials did not respond immediately to requests for comment.
Andrea Mitchell, Greenspan's wife and chief foreign affairs correspondent for NBC television, is represented by the group, according to its Web site.
Greenspan could command up to $150,000 for an appearance, according to one unnamed expert cited in the article. The Fed chairman's current annual salary is about $180,000.
The 79-year-old Greenspan, who has led the Fed since August 1987, is due to step down on January 31, when his nonrenewable term as a member of the Fed's board expires.
White House adviser Ben Bernanke will take over, pending a Senate approval vote scheduled for January 31.