EXIST determines an Advance for the receivables and debts arising from the transactions carried out on the market by Participants within a trading window. At the end of a trading window, a Participant is a Debtor to the extent of the total quantity of matched bids and a Creditor to the extent of the matched offers.  The amount of net receivables or debts resulting from such amounts being offset at the end of the trading window, is reported as Advance. On the first business day following the notice; to give orders on the STP, the Participant makes a payment if it is a Debtor, or receives a payment if it is a Creditor. If the Participant fails to ensure the necessary monitoring and fulfill its advance obligations, the market transactions are suspended.

Important transaction times for the advance process are as follows ;