Generalization to broader CFMMs

Determine which monotonicity arguments established for constant-product automated market makers remain valid for broader classes of constant-function market makers.

Background

The paper derives exact leakage thresholds and sandwich-profit formulas for fee-free constant-product automated market makers, where algebraic cancellations make the analysis tractable. It notes that these cancellations are specific to the constant-product invariant and may not extend to other pricing rules. The unresolved problem is to identify the broader classes of constant-function market makers for which the paper’s monotonicity-based reasoning continues to hold.

References

Constant-product pools admit clean cancellations; which of our monotonicity arguments survive for broader classes of CFMMs is open.

— How Much Must a Private Mempool Hide? Exact Leakage Thresholds for Sandwich Attacks  (2609.31379 - Lin et al., 25 Sep 2026) in Section Open Problems, item 2