Keep these points about flash loans in mind:
1) In many attacks, attackers use flash loans to obtain huge amounts of funds and manipulate oracles that rely on the spot price of a single pool.
2) The borrowed funds, plus fees, must be repaid to the pool before the transaction ends. Otherwise, the entire transaction is reverted, as if it never happened.
3) Using flash loans requires writing your own contract or using specialized tools. Be especially wary of software that claims to make flash-loan arbitrage easy.
The lending protocol Aave, associated with $AAVE , offers flash loans.

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