How Does a Private Mempool Service Earn Revenue?

A private mempool service, such as a Flashbots relay, primarily earns revenue by acting as an intermediary between searchers and validators. Searchers submit profitable bundles to the relay, which then forwards them to the validator.

The searcher's bid (or "bribe") for block inclusion is split between the relay and the validator. The relay's share is its service fee for providing the private, low-latency communication channel and the MEV-optimization service.