Flash loans in the world of decentralized finance are like the "time freeze" ability in sci-fi movies—you can mobilize hundreds of millions of dollars within seconds, with zero collateral, as long as you repay within the same block. This instant release of purchasing power is a double-edged sword for liquidity: on one hand, it can catalyze market opportunities; on the other, it’s the most dangerous tool in the hands of bad actors.

To date, we have seen countless protocols fall into the trap of flash loans. Hackers manipulate oracles by executing rapid sell-offs, causing protocols to collapse like dominoes. But recently, APRO’s performance has broken this curse—it not only withstood attacks but also caused hackers to suffer huge losses after spending high gas fees and cross-chain costs, as they couldn’t close profitable positions.

What’s the secret behind this "defense and counterattack"? It starts with the hackers’ usual tactics. Most flash loan attacks don’t directly exploit contract code but instead use massive instantaneous trading volumes to "brainwash" or manipulate oracles. For example, imagine a small stall selling ten watermelons; suddenly, someone places a 10,000-dollar order to buy all of them, pushing the watermelon price to an absurd high. If a lending protocol is watching this quote closely, hackers can use this false high price as collateral to scam real funds out of the protocol.

APRO’s defensive approach takes a different turn—it no longer blindly trusts a single data source but has built what I call a "liquidity-weighted consensus" mechanism. In this architecture, the oracle is no longer just a simple price crawler but has been upgraded into an intelligent agent with a "time smoothing" algorithm, capable of recognizing abnormal fluctuations and defending against them.