The only common factor in all 22 MCU movies in the last 10 years has been the mid and post-credit scenes. 

Source: Giphy

That is about to change with Avengers: Endgame

Source: CNet

Don't worry. There are no spoilers here. But yeah, for the first time since the inception of the Marvel Cinematic Universe, there will be no post-credit scenes. 

Source: Andrew Plan

And it makes sense. Endgame is the end of Phase 3 of the MCU and will effectively conclude the Infinity Saga. 

So there is nothing left to tease before Phase 4 begins. 

But according to Gamespot, there a bit of an audio stinger at the end, during the time the Marvel logo appears. There is a sound of metal hitting metal, which is open to interpretation but the report suggests that it could be sound of Tony forging first Iron Man armour. 

Source: indieWire

So the choice is yours. You can either sit through the credits to hear that sound or walk off. Personally, I am going to wait till they throw me out of the theatre.