API documentation

Logon (A)

The first message of the session must be a Logon (35=A) message sent by the client. If the credentials are accepted, the server will respond with a Logon (35=A). If the credentials are invalid, the connection will be closed.

Fields

TagNameReqDescription

Tag
Name
Header
ReqY
Description
Standard header, with 35=A.
Tag98
Name
EncryptMethod
ReqY
Description
Because it is always unencrypted, the tag is always set to 0.
Tag108
Name
HeartBtInt
ReqY
Description
The interval in seconds between heartbeats. The tag is always set to 30.
Tag141
Name
ResetSeqNumFlag
ReqN
Description
Supported values: N = No Y = Yes (reset sequence numbers)
Tag553
Name
Username
ReqY*
Description
The user name.
Tag554
Name
Password
ReqY*
Description
The password.
Tag
Name
Trailer
ReqY
Description

YRequired — include this field in every message.

NOptional — may be omitted.

N*Conditionally required — optional unless noted in Description (look for (*)).

Example message

Session

Request

8=FIX.4.4|9=118|35=A|49=YOUR_SENDER_COMP_ID|56=OBERMIND|34=1|52=20260610-12:00:00.000|98=0|108=30|553=your_username|554=your_password|10=124|

Response

8=FIX.4.4|9=118|35=A|49=OBERMIND|56=YOUR_SENDER_COMP_ID|34=2|52=20260610-12:00:00.000|98=0|108=30|553=your_username|554=your_password|10=125|

Pipe format uses | between fields for readability. On the wire, replace each | with ASCII SOH (0x01), or switch to SOH (wire) and copy directly into your FIX API session.

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