Is Budapest Gambit Sound?

Is it practical/sound?
At top engine play probably it is not:

But is it a good opening?

Sorry shouldn't be in game analysis

@Donaldsen I'm pairing up 2 stockfishes in a 10+2 match in my phone (which has 4 2.35 Ghz cores, 4 1.95 Ghz cores, and 4 GB RAM, so not the best specs, but let's see how it goes. I'm using droidfish.

@SavageAntarctican I paired up Leela and SF and heres what happened:

In ICCF correspondence or in engine against engine white can probably hold on to the pawn, defend and convert the endgame.
It is sound enough on normal human level. Kramnik played it when he was young. Speelman played it and considered it sound. I have played it in 2200+ FIDE over the board.
The main practical problem is that is does not happen if white plays 2 Nf3 instead of 2 c4.

It is very sound, you just have to know well a gambit to play it correctly. I only play Smith Morra gambit against sicilian and i have tons of wins.

Definitely sound, it was actually the opening I used to win against my first titled player

@Sneakiest_of_Snakes Is declining Budapest Gambit sound? The computer at 20th depth gives 1.d4 Nf6 2.c4 e5 3.e3 0.22, which is worse than 3.dxe5 but still slightly advantageous for White. I find most gambits declinable, that is declining them might be theoretically worse than accepting the pawn, but still playable and good for taking the opponent out of book.

@OswaldS Definitely!

Its not the greatest opening but its far from "unsound". ESPECIALLY for online blitz/rapid chess. Still significantly better than a lot of 1. e4 game gambits.