Nadex Amends Payout Criterion on its Currency Intraday Binary Contracts, Delists its Core Consumer Price Index Binary Contracts and RBOB Binary and Variable Payout Contracts, and Adds New AUD/USD Contracts

Pursuant to Section 5c(c)(1) of the Commodity Exchange Act, and Commission Regulations §§40.2 and 40.6, Nadex amends the Payout Criterion on its Currency Intraday Binary Contracts, set forth in Rules 12.21, 12.22, 12.23, 12.24, and 12.39 and delists its Core Consumer Price Index Binary Contracts, and RBOB Variable Payout and Binary Contracts, set forth in Rules 12.48, 12.44, and 12.45,respectively. Nadex also adds its new AUD/USD Variable Payout and Binary Contracts, and has set forth the terms and conditions of the new Contracts in Rules 12.96 and 12.97. These amendments will be effective for the start of business on trading day Monday, February 7, 2011.