Can a ‘Private Transaction Relay’ Prevent a Sandwich Attack?

Yes, a private transaction relay, like those offered by Flashbots, can effectively prevent sandwich attacks. By submitting a transaction directly to a block builder or validator without passing through the public mempool, the pending trade is hidden from searchers looking to front-run or sandwich.

The transaction is only revealed when it is included in a block, eliminating the opportunity for pre-emptive trades.