Evidently, superheroes are still subject to the same gender pay gaps that non-superheroes have to deal with.
However, the significant difference in salary doesn't seem to be *totally* unprecedented: According to Variety, Gadot actually signed a contract in 2014 that gave her $300,000 for each DC movie she does (though she likely will make a lot more from bonuses, and Cavill's multi-million "Man of Steel" earnings do include his extremely sizable bonuses.)
Not to mention, Chris Evans also earned the same amount of money as Gadot for his role in the first "Captain America" movie.
But at the end of the day, viral articles are claiming that Gadot only made two — yes, TWO — percent of what Cavill made for his movie, even though "Wonder Woman" has already earned over $570 million worldwide to date, has grossed $274 million domestically, and it's still in theaters.
(To put that in perspective, "Man of Steel" grossed around $290 million domestically when it was all said and done.)