Flash loan
A loan that must be repaid under the protocol’s rules within the same atomic transaction.
In more detail
A flash loan lets a transaction temporarily use assets without the usual upfront collateral for that repaid loan. The contract checks repayment before the transaction can complete; if it isn't met, execution reverts. This can support legitimate multi-step operations, but it doesn't mean free funds, and a failed included attempt can still cost gas.
How you might use it
One transaction borrows tokens, trades across two venues and repays the loan plus its required fee; without repayment, the operation reverts.
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