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What is Flash Loan?
A flash loan lets you borrow millions in crypto with zero collateral — but you must repay it in the same transaction block. Used for arbitrage and exploits.
Full Explanation
Flash loans are uncollateralized loans that must be borrowed and repaid within a single blockchain transaction. If the borrower can't repay, the entire transaction reverts as if it never happened — so there's no risk to the lender. Flash loans enable arbitrage (exploit price differences across DEXs), liquidations, collateral swaps, and unfortunately, attacks on DeFi protocols. Aave was the first to offer flash loans.
Related Terms
Last updated: 2026-03-21
