Transaction-Scoped Reference Tolls in a Modified AMM Manager: Mechanism, Local Tests and Distributional Limits

An automated market maker can charge repeated interactions with a currency more heavily than a single interaction, but operation counts do not identify harmful intent. This report examines JitToll, a modification to an xGas PoolManager derived from Uniswap v4. It counts non-native currency references in transient storage and computes a quadratic rate from the pool fee plus a 10-basis-point floor. Liquidity additions and removals incur a charge on principal; swaps incur an additional charge on the unspecified leg after the pool's own fee. Removing a position in the block of its latest addition increases the rate's reference ordinal. A reconstructed local build passed ten existing tests, including repeated swaps, an add-swap-remove sequence, rate saturation and native-currency counter exemption. These results verify the tested accounting rules, not general prevention of extraction or improved welfare. The mechanism also affects legitimate composed routes and liquidity operations. Its value therefore depends on transparent quotes, distributional evaluation and accountable control of collected revenue. Preparation of this report was assisted by Codex. The research programme is directed toward human agency, financial inclusion, and evidence-based accountability. Intended social benefits are distinguished from measured technical results in the manuscript. The manuscript and newly authored analysis are offered under CC BY 4.0. Any supplied source files retain the license terms stated in the supplement; the record license does not replace third-party source licenses.