OnTopHook

A liquidity rules hook. It controls who adds liquidity and only lets approved callers create pools.

• Rules for adding liquidity

  It decides who can add liquidity, or when.

  The code that does this (beforeAddLiquidity):

  function beforeAddLiquidity(address sender, PoolKey calldata, ModifyLiquidityParams calldata, bytes calldata)
      external
      view
      onlyPoolManager
      returns (bytes4)
  {
      if (sender != launchpad) revert NotLaunchpad();
      return IHooks.beforeAddLiquidity.selector;
  }

• Only approved callers create pools

  New pools with this hook can only be created by approved callers, for example its own factory or launcher.

  The code that does this (beforeInitialize):

  function beforeInitialize(address sender, PoolKey calldata, uint160) external view onlyPoolManager returns (bytes4) {
      if (sender != launchpad) revert NotLaunchpad();
      return IHooks.beforeInitialize.selector;
  }

Who controls it: The hook developer can change which launcher it works with. The launchpad can call: register, refill. The code cannot be changed.

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