The 37-year-old told the site he'd be a "good sixth-man addition" to a team and cited Vince Carter as an example of the role he could serve on an NBA roster. Carter turned 41 in January and averaged 5.4 points and 2.6 rebounds in just under 18 minutes per game for the Sacramento Kings.
Rafer Alston famously played in the NBA after building a reputation on the streetball circuit, but Alston was 23 when he debuted for the Milwaukee Bucks during the 1999-00 season.
Williams' ball-handling skills are the stuff of legend and have helped him build a following.
But the NBA is likely a bridge too far given both his age and lack of professional basketball experience outside the league.