I haven't seen any use case of them that I would consider legit (they're used for messing with other smart contracts/DEXes), but flash loans are a cool idea: Yo

I haven't seen any use case of them that I would consider legit (they're used for messing with other smart contracts/DEXes), but flash loans are a cool idea: You can borrow coins only if you return them within the same transaction. Obviously very low risk for the lender, so you're essentially paying to borrow someone's liquidity for a tx. I'd say the decentralized exchanges (DEX) themselves and some other DeFi (decentralized finance) features are legit innovation though.