James Harden -- Awesome Drunken Pledge to Make Adidas Amazing (VIDEO)

James Harden is officially the greatest boozed up spokesman in sports history after making an amazing pitch for Adidas and disavowing Nike ... while spilling out of a club at 2 AM.

The Beard had his $200 million Adidas contract on the brain as he and his crew left 1 OAK Wednesday morning. Naturally, our photog asked if everything was cool with his new bosses ... y'know, since James was spotted wearing Jordans the other night.

Just watch -- cause the video is awesome! As Harden jumps into his SUV he starts yelling, "I got $200 million!" ... and then brags "Adidas is about to be amazing!"

There ya go Adidas ... all the promotion you ever wanted and more.

Oh, and we checked Harden's kicks last night. NO NIKES! Balenciagas, bro.