William Haynes, better known as Praxi or Praxi Plays, is a Floridian producer and rapper.

Praxi gained popularity on YouTube with the success of a series in which he details the production of a beat and writes lyrics for a song in an attempt to recreate the styles of different rappers, with some of the most popular installments focusing on $uicideBoy$ and Ski Mask The Slump God.

On November 1st, 2019, Praxi released his debut project Mood, a six-track EP featuring production from other producers such as Bsterthegawd.