Briefing
The core problem is the structural vulnerability of Layer-2 transaction ordering mechanisms to Maximum Extractable Value (MEV) strategies that leverage priority fees. This research formally establishes a new attack vector → Revert-Based MEV , where rational searchers pay high priority fees to secure a transaction’s inclusion and then intentionally revert it if the trade is unprofitable, effectively turning the priority fee into a cheap, risk-mitigated option to test market conditions. The foundational breakthrough is the formal analysis that models reverts as equilibrium outcomes of rational MEV strategies, proving that this behavior is a structural feature of the rollup’s fee market microstructure. The single most important implication is that protocol-level reforms to L2 sequencing, fee markets, and revert protection are urgently required to prevent systematic economic instability and user harm on fast-finality systems.
Context
Prior to this work, the primary focus in MEV research centered on mitigating traditional front-running, sandwich attacks, and the centralization risks inherent in block production. The prevailing theoretical limitation was the assumption that a transaction’s failure (a revert) was an operational error, not a calculated component of a rational economic strategy. The challenge was that existing models failed to account for the high-cost, zero-value transaction as a strategic tool for risk-free market probing, especially within the fast-finality, priority-fee-driven environment of Layer-2 rollups.
Analysis
The core mechanism identified is the strategic use of the priority fee as an option premium. A searcher submits a high-value transaction with a high priority fee to ensure it is ordered quickly by the sequencer. If the transaction executes and is profitable (e.g. the desired arbitrage is successful), the searcher pays the fee and earns the profit. Crucially, if the transaction would fail or be unprofitable due to a race condition or stale price, the transaction is intentionally structured to revert.
In this scenario, the base fee is paid, but the priority fee is often returned, minimizing the loss and allowing the searcher to “test” the market at a low cost. This fundamentally differs from previous approaches by demonstrating that the revert is the successful outcome of the strategic probe, not the failure of the execution.
Parameters
- Peak Revert Rate on L2s → 40% – The highest observed daily transaction revert rate across all analyzed Layer-2 networks.
- Arbitrum Peak Revert Rate → 20% – The highest daily revert rate specifically observed on the Arbitrum network during the analysis period.
- Primary Revert Activity → Swaps/DEX activity – The category of transactions predominantly linked to the revert-based MEV strategy.
Outlook
This research necessitates a pivot in mechanism design toward L2 sequencing and fee market reforms. Future work must explore cryptographic sorting mechanisms that eliminate the priority fee advantage or implement novel revert-protection protocols that penalize or re-price reverted, high-priority transactions. The theory unlocks new avenues for research into “fairness granularity” and the creation of economic models that treat transaction failure as a measurable, strategic input. Real-world applications in the next 3-5 years will include the deployment of new, revert-resistant L2 sequencers and the widespread adoption of cryptographic commitment schemes that prevent the use of priority fees as an option for market probing.
Verdict
The formal identification of Revert-Based MEV fundamentally alters the understanding of Layer-2 security, proving that transaction failure is a structural economic strategy that mandates protocol-level sequencing reform.
