Hook

A simple tax for token pools paired with ETH. When someone sells the token for ETH, or takes liquidity out, the hook sends a fixed share of the ETH to the pool creator.

• Tax on sells

  When a trader sells the token for ETH, a fixed percent of the ETH they get goes to the pool creator. Buying has no extra fee.

  The code that does this (_afterSwap):

  function _afterSwap(address, PoolKey calldata key, SwapParams calldata params, BalanceDelta delta, bytes calldata)
      internal
      override
      returns (bytes4, int128)
  {
      if (params.zeroForOne) return (this.afterSwap.selector, 0);
  
      int128 ethOut = delta.amount0();
      if (ethOut <= 0) return (this.afterSwap.selector, 0);
  
      uint256 fee = uint256(uint128(ethOut)) * creatorFeeBps / 10_000;
  
      poolManager.take(key.currency0, creator, fee);
      emit CreatorFeeTaken(creator, fee);
  
      return (this.afterSwap.selector, int128(int256(fee)));
  }

• Tax on removing liquidity

  Liquidity providers pay the same percent on the ETH they take out of the pool.

  The code that does this (_afterRemoveLiquidity):

  function _afterRemoveLiquidity(
      address,
      PoolKey calldata key,
      ModifyLiquidityParams calldata,
      BalanceDelta delta,
      BalanceDelta,
      bytes calldata
  ) internal override returns (bytes4, BalanceDelta) {
      int128 ethOut = delta.amount0();
      if (ethOut <= 0) {
          return (this.afterRemoveLiquidity.selector, toBalanceDelta(0, 0));
      }
  
      uint256 fee = uint256(uint128(ethOut)) * creatorFeeBps / 10_000;
  
      poolManager.take(key.currency0, creator, fee);
      emit CreatorFeeTaken(creator, fee);
  
      return (this.afterRemoveLiquidity.selector, toBalanceDelta(int128(int256(fee)), 0));
  }

• ETH pools only

  The hook only works in pools that pair a token with native ETH.

  The code that does this (_beforeInitialize):

  function _beforeInitialize(address, PoolKey calldata key, uint160) internal pure override returns (bytes4) {
      if (!key.currency0.isAddressZero()) revert NotNativeEthPool();
      return this.beforeInitialize.selector;
  }

Who controls it: Nobody can change anything. The tax rate (at most 10%) and the wallet that gets it are fixed when the hook is deployed, and the code can't be upgraded.

Based on the hook’s published code.What do these labels mean?