Miner Extractable Value (MEV)

The miner extractable value (MEV) is a measure of the miner’s profitability for each block they produce. The very first form of MEV was front running done by bots that would replicate users’ tractions for higher gas transactions, allowing miners to gain more profits.

Other forms of MEV attacks includes back running, where the miner is profitable by executing the user’s transaction that can drastically change the market condition. The sandwich attack is yet another form of MEV that occurs by combining both front and back running attacks.

MEVs are always in favor of the miners since they only have the capability of organizing a transaction based on their preference within a block. Such value extraction is only possible, given the flawed design within the Ethereum mempool.