En route to winning a silver medal, Laurie Hernandez protested the score on her beam routine on Monday. That’s not unusual in and of itself across sports, where video challenges are now routine, but here’s what is: The inquiry alone cost Team USA as much as $300. Yes, really.

Imagine if an NFL coach wanting to challenge a call had to throw a few bills on the field as well as a red flag. Imagine if a tennis player wanting to challenge a line call had to pull out a wad of cash before protest. Strange, yes, but that’s exactly what happens in gymnastics competitions, including the Olympics.

Gymnastics coaches can protest a scoring judgment of a gymnast’s routine, but there are some very tight restrictions, as Sports Illustrated noted back in 2012. Coaches, gymnasts or other country officials must make a verbal challenge, known as an inquiry, between the posting of the score and the end of the next gymnast’s routine. They must supply a written version of the protest within four minutes of making the verbal protest. Oh, and they must pay a fee, which can be anywhere from $100 up to $300 in cash, depending on the event.

The inquiry system was devised by the International Gymnastics Federation after 2004, when widespread protests about judging led to a complete overhaul of the scoring system, including the elimination of the “perfect 10.” Scores now include an open-ended difficulty score, measuring the complexity of the routine, and the execution score, measuring how well the gymnast performed the routine.