Jalen Carter's spit just cost him a wad of cash -- the NFL just hit the Eagles defensive tackle with a $57K fine for his role in a wet incident with Dak Prescott in the season opener.
The NFL revealed the punishment on Tuesday ... days after Carter was caught in the act at the beginning of "Thursday Night Football" last week.
The league stated the fine will be Carter's game check -- which comes out to $57,222.
He was also suspended for one game .