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CME STP FIX processes Trade Capture Messages, converting outgoing CME STP FIXML messages to FIX and incoming CME STP FIX messages to FIXML. The CME STP FIX Interface is based on standard FIX 4.4 (Financial Information Exchange protocol, 
All FIX administration-level messages are supported. The structure and semantics of FIX messages adhere to the standard, with some modifications.   
The following FIX application-level messages are supported:
  • From FIX Client to CME STP FIX:
    • Trade Capture Report Request (tag 35-MsgType= AD).
  • From CME STP FIX to FIX Client:
    • Trade Capture Report Request Ack (tag 35-MsgType = AQ);
    • Trade Capture Report (tag 35-MsgType = AE).

Other application-level messages are not supported. If an unsupported message is received by CME STP FIX, Session Level Reject (tag 35-MsgType= 3) message is sent in a response.

All FIX messages contain Standard Message Header and Standard Message Trailer component blocks. CME STP FIX usage of these blocks is compliant with standard FIX 4.4. 

FIX Session Layer - Identification of FIX Session

TCP/IP over SSL is required to establish a physical connection to CME STP FIX. FIX Client should act as an initiator and use the following details when establishing FIX Session to CME STP FIX.

  • FIX Version = FIX 4.4
  • SenderCompID = as defined by CME Group
  • TargetCompID = 'CMESTPFIX#' The value will be increased for each new user at the Firm, e.g., CMESTPFIX1, CMESTPFIX2, CMESTPFIX3, etc.
  • TargetSubID = 'STP'
  • Heartbeat interval = any between 30 and 60
  • FIX session Username
  • FIX session Password


FIX Client uses a Logon (tag 35-MsgType=A) message including the following tags to perform authentication at CME STP FIX:

  • tag 49-SenderCompID = as defined by CME Group
  • tag 56-TargetCompID = 'CMESTPFIX#' The value will be increased for each new user at the Firm, e.g., CMESTPFIX1, CMESTPFIX2, CMESTPFIX3, etc.
  • tag 57-TargetSubID = 'STP' 
  • tag 34-MsgSeqNum = 1
  • tag 141-ResetSeqNumFlag = Y
  • tag 553-Username = Customer SmartClick API ID
  • tag 554-Password = Customer SmartClick Password

Login Sample


FIX Clients are required to use the Logout (tag 35-MsgType=5) message to gracefully terminate a FIX Session with CME STP.

Sequence Numbers Reset

CME STP FIX expects the FIX Client to reset incoming and outgoing sequence numbers every time a FIX session is established (i.e. CME STP FIX expects a Logon (tag 35-MsgType = A) message from the FIX Client to contain tag 34-MsgSeqNum = 1 and tag 141-ResetSeqNumFlag = Y).

CME STP Credentials

In order to subscribe for CME Group trade, the FIX Client should provide the following:

  • CME STP Username – provided in Logon (tag 35-MsgType = A)
  • CME STP Password – provided in Logon (tag 35-MsgType = A)
  • CME STP FirmID and Role – provided in Parties group of Trade Capture Report Request (tag 35-MsgType = AD)

Supported CME Group Products

The public CME STP FIX interface supports all products available on CME STP.

CME STP Availability

CME STP is available in Production beginning 2 PM Central Time Sunday afternoon through 9 PM Central Time Friday. Internal testing occurs every weekend in the Production environment; please ensure that your API is not connected from Friday night until Sunday afternoon.

See CME Group trading hours 


See standard CME Group disclaimer and Trademark information.