During the Credits
There are no extra scenes during the credits of Avengers: Endgame, however, there are signatures from the original Avengers cast by their names followed by extra audio related to the original film’s plot.
There is audio of metal clanking at the end of the credits when the Marvel logo is shown. This sound seems to be the same as when Tony Stark was forging the Iron Man suit in the cave during the very first Iron Man film from 2008 and in honor of the fallen Avenger.
After the Credits
There is no stinger after the credits of Avengers: Endgame.
Special thanks to BedTHeBatman, Sven, Indiana Mulder, Isaac, Ng Hau Lim, @f3tjang, Tom lau, Nabil, Tom lau, Lothar Dall’O, parksmash, FR4NC15, Laurie, Abdil Jafni, ShoMari DaVis, Cristian Alejandro, and DCB316 for the stinger submissions!