Added to his previous deal of $201m, signed in 2017, Curry becomes the first player in NBA history to ink multiple deals worth at least $200 million, ESPN's Adrian Wojnarowski reported on Tuesday.
Curry will be 38 at the end of his new contract but has shown no signs of slowing down after averaging a career-high 32.0 points during the regular season to become the oldest NBA scoring champion since a 35-year-old Michael Jordan accomplished the feat in 1997-98.
The move comes during a crucial offseason for the Warriors after two straight injury-riddled campaigns have seen them fall short of a postseason berth.
Curry carried the Warriors in 2020-21 with Klay Thompson and 2020 second overall pick James Wiseman both suffering season-ending injuries.
Golden State general manager Bob Myers admitted he is not sure if Thompson will be healthy by the start of next season. The five-time All-Star tore his right Achilles before last season's training camp.
That came after Thompson missed the 2019-20 season with a torn ACL suffered in a Game 6 NBA Finals loss in June 2019 that gave the Toronto Raptors their first NBA title.
“I don't know that it'll be the start of the year,” Myers said. "We'll see more as camp gets closer. When I say start of the year, I mean Game 1. I don't know if that's realistic or not.
“What we're focused on is when do we expect Klay to be Klay, and I don't know if that'll be January, February, March. It's too early to say."
With Curry at 33 years old and Thompson and Draymond Green both 31, the Warriors have been connected to rumors of a win-now move that would add veteran talent, but Myers has yet to pull off such a blockbuster.
Wiseman, whose college career at Memphis was cut short due to eligibility issues, has played just 42 games since leaving high school and remains a raw prospect.
Myers has insisted that the club does not intend to trade Wiseman, however, saying he can be an asset in both the short and long term.
The Warriors left many pundits puzzled after last Thursday's NBA Draft, where they used the seventh overall pick on unpolished forward Jonathan Kuminga and the 14th overall selection on guard Moses Moody, leading to even more trade speculation.
There appears to be much left to accomplish this offseason for Myers and the Warriors, but a new contract extension ensures Curry will be the centrepiece of it all, just as he was for three NBA titles and five straight NBA Finals appearances from 2015-19.