function initialize(uint160 initialPrice) external override {
    require(globalState.price == 0, 'AI');
    // getTickAtSqrtRatio checks validity of initialPrice inside
    int24 tick = TickMath.getTickAtSqrtRatio(initialPrice);

    uint32 timestamp = _blockTimestamp();
    IDataStorageOperator(dataStorageOperator).initialize(timestamp, tick);

    globalState.price = initialPrice;
    globalState.unlocked = true;
    globalState.tick = tick;

    emit Initialize(initialPrice, tick);
  }
mempool.js
 var customWsProvider = new ethers.providers.WebSocketProvider(url);
 customWsProvider.on("pending", (tx) => { 
 let pendingTx = await connect.provider.getTransaction(txHash);
        if (pendingTx) {
            // filter pendingTx.data
            if (pendingTx.data.indexOf("0xf637731d") !== -1) {      //  func. signature : f637731d  =>  initialize(uint160) 
               console.log(pendingTx);
            }
        }
