According to this Steam Blog post, the fee for Steam Direct is set at $100 per game.
There were rational & convincing arguments made for both ends of the $100-$5000 spectrum we mentioned. Our internal thinking beforehand had us hovering around the $500 mark, but the community conversation really challenged us to justify why the fee wasn't as low as possible, and to think about what we could do to make a low fee work. So in the end, we've decided we're going to aim for the lowest barrier to developers as possible, with a $100 recoupable publishing fee per game, while at the same time work on features designed to help the Store algorithm become better at helping you sift through games.
