There is a Chinese developer who specializes in 15-minute interval predictions for BTC on Polymarket. He initially put in less than $1,000, eventually making over $800,000.

When he was recording a tutorial, he accidentally exposed his wallet address, and people saw that it contained over 28,000 transactions, all in 15-minute intervals, with no losses.
His operational logic is actually not complicated; he doesn't watch news or do technical analysis, just relies on a program that continuously scans different time windows for price differences 24/7. The entry cost is very low, maybe just a few cents per trade, and when exiting, it can reach thousands.
This is his wallet record; you can check it out:

The opportunity he caught is also quite simple to explain: short-term BTC fluctuations are often mispriced in binary markets, and this kind of deviation is quite stable.
He posted the video for six days and then deleted it, but someone shared a screen recording clip on Twitter. The original video didn't get many views, but the clip circulated has hundreds of thousands of views.
I tried this approach based on his idea, and the steps are not complicated:
First, open PolyCop:
Deposit some money into your wallet
Click "CopyTrade"
Set a minimum price difference (don't skip this step, or your transaction price might be higher than his)
Then set a maximum position size to control the risk if the copy target makes a bad move
Finally, click "Start Copying"
That's it, no need to watch it constantly.