Effective with the September 2005 currency delivery cycle, firms with a delivery obligation greater than $50 million per currency pair are required to use CLS to facilitate delivery, per CME Rule 740.

Firms failing to comply with CME Rule 740 will be charged an assessment fee of $10 per million for any CLS eligible currency pair exceeding the threshold.  CLS supports all CME currency products with the exception of Mexican Peso, Polish Zloty (USD and Euro), Hungarian Forint (USD and Euro) and the Czech Koruna (USD and Euro).