The era of arbitrage bots on a leading prediction platform may really be coming to an end.

It's not that someone publicly announced it, but an invisible rule has been inserted like a knife—time arbitrage has been forcibly blocked. Most people haven't even realized what just happened.

Yesterday, I dismantled a bot that specialized in trading 15-minute K-line charts. In just one month, it went from $313 to $414,000. It looked like a booming success, but today the situation has changed.

That platform suddenly introduced new rules. There was no official announcement, but the actions were frighteningly precise.

**The rules changed, targeting only the 15-minute market**

Careful observation of this move: other markets still have zero fees, only taker fees are charged, and maker rebates are even given back. But the 15-minute market is different—fees are dynamically calculated, with a cap at 3.15%.

Even more interesting is how they collect fees. Near the 50/50 price point, the rate is highest—exactly where all bots love to place orders. The fee is precise to four decimal places, indicating the platform has a thorough understanding of bot behavior.

A quick calculation makes it clear: buying 100 shares at $0.50 costs about $1.56 in fees; at $0.05, the fee drops sharply to $0.05.

**The bot's advantage has been cut in half**

A bot can only make money with its core skills—accurately capturing mid-term trends and arbitraging frequently. Now that the mid-term trend fee has been directly cut, profit margins instantly evaporate. Those robots that rely on tiny differences to survive simply can't continue.

This move by the platform is neither a blunt ban nor outright resistance; instead, it uses cost leverage to precisely strike. No matter how smart the bot is, it can't outplay the numbers in the ledger.