Hook

A trading tax hook. It takes a cut of every trade.

• Takes a cut of every trade

  On top of the normal pool fee, it keeps a share of each trade. It can never be above 10%. The fee is paid out in the same trade.

  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)));
  }

Who controls it: Nobody. The hook has no admin functions, and the code cannot be changed.

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