Rapper Slim 400 Makes Investment in World’s Largest Marijuana Website BUDTRADER.COM. BudTrader.com, the world’s largest online medical marijuana marketplace, announces that rapper Slim 400 is the latest celebrity to become an investor in the site. Slim 400, who is based out of Compton and is currently on tour with platinum artists YG and Kendrick Lamar, has invested an undisclosed amount into BudTrader’s online platform, which allows users to post free, classified ads for cannabis products, services, jobs, etc. “I’m not just a rapper, I’m also a businessman. BudTrader is a great investment opportunity. It’s the biggest weed website in the world at a time when weed is finally becoming legal. It’s a no-brainer,” says Slim 400.