How to Access the Ethereum Mempool: Streaming Pending Transactions From a Co-located Node

Every transaction spends a moment in limbo between “broadcast” and “mined”. That waiting room is the mempool, and it is where a lot of the interesting work in Ethereum happens: a searcher spots an arbitrage before it lands, a bot front-runs a large swap, a liquidation watcher sees the transaction that will tip a position underwater. If you want to act on a transaction before it is final, you have to read the mempool.