Flash swaps

Receive tokens first and pay at the end of the same transaction.

swap sends output tokens before checking payment. If data is non-empty, the pool calls your contract: solidity function neuraV1Call(address sender, uint256 amount0, uint256 amount1, bytes calldata data) external; Inside the callback you can do anything — arbitrage, liquidate, refinance — as long as, when it returns, the pool's invariant holds after fees. Otherwise the entire transaction reverts and nothing happened. text pool ──tokens──▶ you ──(use them)──▶ repay pool ──▶ invariant check ✓ The re-entrancy lock prevents calling back into the same pool during the callback.