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  • An Execution Report acknowledgment during the pre-openopen 
  • An Execution Report - Reject during the closeclose  


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Test products are available for Order routing only — trades and Immediate or Cancel (IOCFill or Kill (FOK) and Fill and Kill (FAK) orders are not supported.


Test products have the following iLink order entry and market data messaging identifiers:

CME Globex Test Product


MDP 3.0: tag 6937-Asset

iLink: tag 55-Symbol

MDP 3.0 tag 1151-SecurityGroup

Test – E-mini S&P MidCap 400 Futures

0MD (zero-M-D)


Test British Pound / U.S. Dollar (GBP/USD) Physically Deliverable futures contract 

0GB (zero-G-B)


iLink Order Entry

Order entry functionality is available for test productson iLink as described below.


Only the Pre Open market state is available for test contracts per the following schedule.

DayTime (CT)Instrument Security Status (tag 35-MsgType = f)
Sundaytag 326-SecurityTradingStatus =
Pre Open16:0021 (Pre Open)
Close16:594 (Close)
Monday-Thursdaytag 326-SecurityTradingStatus =
Pre-Open16:4521 (Pre Open)
Close16:594 (Close)