Except in periods of extreme volatility, the clearinghouse (in the futures market)'marks-to-market' each trader's position:

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The clearinghouse typically marks-to-market each trader's position on a daily basis (i.e. once a day). This involves adjusting the trader's margin account based on the current market price of the futures contract. The purpose of this process is to ensure that each trader has sufficient margin to cover their potential losses and to prevent any defaults in the event of adverse price movements. While extreme volatility may necessitate more frequent marking-to-market, daily is the standard frequency.

Except in Periods of Extreme Volatility, the Clearinghouse (In the Futures