According to sources, Michael Keaton receives an average of $5 million to $10 million for acting in a movie. For instance, he was paid a sum of $5 million for playing the role of the world’s greatest detective i.e, Batman in 1989. As of today, the sum is worth more than $10 million today (after adjusting for inflation).
Link: https://www.thesuperficial.com/michael-keaton-net-worth/