meva

meva flips the mev game. instead of fighting sandwich bots (which always fails), we tax them and share the profits.

our uniswap v4 hook detects bots using on-chain signals: high gas prices, contract callers, known addresses, and rapid-fire swaps. detected bots pay 10-50% tax on their trades. normal users pay standard 0.3% fees.

captured mev flows to a dividend vault and splits: 50% to liquidity providers as extra yield, 30% as rebates to sandwich victims, 20% to protocol stakers.

bots can self-register as "licensed" (0.1 eth fee) for lower 10% tax—civilizing mev instead of eliminating it.

result: bots still profit (less), users get compensated, lps earn more, everyone wins.

core is a uniswap v4 hook (MevaHook.sol) using beforeSwap to analyze transactions and override fees dynamically. bot detection scores addresses based on: known registry match (+100), gas price vs rolling average (+35 if 3x), extcodesize check for contracts (+25), swap size (+15), same-block swaps (+20). score ≥60 triggers bot tax.

built with foundry + solidity 0.8.26. extends BaseHook from v4-periphery, uses LPFeeLibrary.OVERRIDE_FEE_FLAG for dynamic fees. MevaVault handles dividend distribution with masterchef-style accounting (accDividendPerShare pattern) for gas-efficient claims.

BotRegistry allows self-licensing via payable function—bots register to pay lower taxes, creating protocol revenue. 61 unit tests covering detection logic, vault accounting, and edge cases.

hacky bit: test harness overrides validateHookAddress() to bypass v4's address-based permission system during testing.