mev-toolkit/MEV_searchers/order_flows/101.md

types of private order flows

rpc-based "payment for order flow protocols" (POFPs)

• this type of private order flows can be realized by modifying either the user's rpc or by modifying the protocol's frontend
• the rpc endpoint re-broadcasts (forwarding) the tx to nodes.
• in respect to every pending tx they receive, they can: 1) censor, 2) forward to some mempool, or 3) forward it directly to some block-builders or validators.

validator transaction reordering protocols (VTRPs)

• private tx reordering
• two goals: 1) identify valuable user txs, 2) replace the POFP's value-extracted tx with its own value-extractive tx
• when a VTRP is able to identify a valuable user tx but, due to the tactics of the POFP, is unable to inject its own transaction in place of the POFP's -> VTRP's optimal strategy is to censor the user's transaction from the final block