My college roommate, a Chinese guy, works as a data engineer at Palantir and has been in New York for 7 months.

Last week, he received a call from his mom at 3 a.m., and as soon as he answered, he started crying. His house in Shanghai was about to be repossessed by the bank, and they had 30 days to come up with $180k, or the whole family would have nowhere to live.
He hung up, and the next morning transferred $180k to his mom. "Done, the house is saved."
His mom was stunned and asked where he got so much money.
He said, "Polymarket time zone arbitrage. But this window is closing fast."
He showed me the data: in January, he could still make $8,000 a week, now only $3,000. In about half a year, this pattern will probably be completely over, and currently about 200 people know about it.
He only trades from 11 p.m. to 3 a.m. when the U.S. is asleep. During this period, liquidity gaps appear, and retail traders can't stay up all night.
He used Claude, building a system in 36 hours specifically to capture time zone gaps, overnight accumulation, and news delays, prioritizing Asian trading hours.
"Now, new competitors are entering every week."
He fed all 86 million trading records from the polycop repository into Claude. Claude only asked one question: "Where is it deployed?"
PolyCop.
After 52 hours, the numbers on the screen started to jump.
$11,200, 243 trades, 77% win rate, over four weeks.
It replicated two main wallets: one made $167k, trading only from 10 p.m. to 4 a.m.; the other made $142k, specifically entering trades while Americans are sleeping.
This window is indeed closing; more and more people are aware of it.
There’s an old Chinese saying: the first mouse eats the cheese, the second mouse gets caught in the trap.
His mom received photos showing the house was saved.
My mom sent me a message: When are you finally going to find a proper job?