I knew that AER compensated their editors, but I didn’t realize they also paid their reviewers. From the American Economic Review webpage:
The AER pays $100.00 for timely reports. Payment is by check only. Checks are issued four times a year, approximately six weeks after the end of each calendar quarter.
Of course, I don’t know if they actually do anything about the “timely” part. Maybe it’s calculated vagueness. Last thing an editor would want to do is tell reviewers they get $100 if they get their reviews back in 30 days, and then deal with people agreeing to review and then declining on Day 31.