Index / MEV donate

pattern · MIT · last updated 2026-08-27

MEV donate

Skim swap output to pending, then flush() donates to in-range LPs.

First-party rewrite inspired by FairArbooors (EthLondon) and Detox. afterSwapReturnDelta takes skimBps of swap output into pending balances per pool; flush() unlocks a donate + settle path so in-range LPs receive the skim (same unlock pattern as LpRewards). Skims both swap directions. Teaching cut of MEV-to-LP redistribution — not a production MEV auction. Experimental. Listing is not an audit. Forge tests under test/MevDonate.t.sol.

Permission bits

These bits must match the deployed address. Confirm on-chain before you route.

afterSwapafterSwapReturnDelta

Solidity

Excerpt from contracts/MevDonate.sol. Copy the full file to implement this. Not an audit.

function getHookPermissions() public pure override returns (Hooks.Permissions memory) {
    return Hooks.Permissions({
        beforeInitialize: false,
        afterInitialize: false,
        beforeAddLiquidity: false,
        afterAddLiquidity: false,
        beforeRemoveLiquidity: false,
        afterRemoveLiquidity: false,
        beforeSwap: false,
        afterSwap: true,
        beforeDonate: false,
        afterDonate: false,
        beforeSwapReturnDelta: false,
        afterSwapReturnDelta: true,
        afterAddLiquidityReturnDelta: false,
        afterRemoveLiquidityReturnDelta: false
    });
}

Spec

FAQ

Can I paste this into production? The snippet is an excerpt. Use the full file at the source URL, match flags to the address, and treat this page as a map, not a guarantee.

How do I build this safely? Start with secure v4 hooks and the OpenZeppelin hooks guide.