Release Rebate (token symbol RBTE) on Sepolia as a univ4_hook launch.

Token: Rebate (RBTE), total supply 1,000,000,000 RBTE with 18 decimals, minted once to the deployer (a separate zero-argument ERC-20, no mint, owner or admin).

Hook: LPDonateHook, a Uniswap v4 hook on the token's native-ETH pool that donates part of every swap to in-range LPs within the same swap.

In afterSwap it takes 50 bps (0.5%) of the swap's unspecified leg (the output on exact-in swaps, the input on exact-out swaps) as a positive unspecified delta of floor(|unspecified amount| x 50 / 10,000) and, in the same afterSwap, donates exactly that amount to in-range LPs with PoolManager.donate in that currency; the hook's credit from the returned delta and its debt from the donate cancel inside the swap, so it never holds funds.

If in-range liquidity after the swap is zero (donate would revert), the hook takes nothing for that swap. It works in both currencies: ETH on exact-in sells and exact-out buys, the token otherwise.

Events: Donated(poolId, currency, amount).

Views: lifetime donated per currency per pool.

README: the donation reaches whoever is in range at the post-swap tick, including JIT liquidity added in the same block.

Deploy shape, matching the live Sepolia hook launches 170 and 186 (168 passed the mainnet PoolManager and is not a model): LPDonateHook's only constructor argument is the Sepolia PoolManager 0xE03A1074c86CFeDd5C142C4F04F1a1536e203543; every rate, window and threshold here is a source constant; there is no owner, admin, setter, pause, upgrade or sweep, and no $owner or $token argument.

Permissions are exactly afterSwap, afterSwapReturnDelta (low address bits 0x0044), all others false; the constructor calls Hooks.validateHookPermissions and the CREATE2 salt is mined for those bits.

The factory initializes the pool (currency0 native ETH, currency1 RBTE, fee 3000, tickSpacing 60) and seeds one-sided RBTE liquidity, so nothing in the hook may revert that initialize or that liquidity add (launch 138 was parked when a beforeInitialize gate reverted the factory), and the first buy lands in a pool that holds no ETH. All state is keyed by PoolId; a pool on this hook whose currency0 is not native ETH gets zero deltas and no other effect.

Every callback requires msg.sender == PoolManager.

Tests (Foundry, a real v4-core PoolManager deployed in the test, hook at a mined address): a launch rehearsal that initializes at the manifest price, seeds one-sided RBTE liquidity like the factory and makes the first buy into the ETH-less pool; exact-in and exact-out in both directions; dust amounts; a pool whose currency0 is not ETH; direct callback calls from a non-PoolManager address revert; fuzzed sizes; and specifically: 0.5% on all four swap modes in the right currency; LPs' fee growth rises by the donation; a swap ending with zero in-range liquidity pays nothing and does not revert; dust; the hook's balances and claims stay zero.

An independent adversarial review (read-only) must attack: the delta sign and in-swap settlement, the zero-liquidity path, currency choice per swap mode, rounding, gas, and JIT capture of donations. It reports each finding with the exact call sequence that triggers it.

Website: one static page (dist/index.html) that reads the hook's views and events and the pool price through Uniswap's Sepolia StateView, with a buy/sell form that swaps through Uniswap's published Sepolia PoolSwapTest router (check it has code). It shows donated totals per currency and the last 24 hours of donations (Donated events) and, as a rough yield figure labelled an estimate, those donations per unit of current in-range liquidity (StateView getLiquidity).