Published scope
| Page | Description |
|---|---|
| Session layer | Transport framing, sequence numbers, logon, heartbeat, resend, gap fill, failover, and logout behavior. |
| Session messages | FIX session message types and body fields for logon, heartbeat, test request, resend request, reject, sequence reset, and logout. |
| Order entry | NewOrderSingle (35=D) fields, supported order types, conditional orders, and session permission matrix. |
| Order management | OrderCancelRequest (35=F) and OrderCancelReplaceRequest (35=G) fields, validation, and lifecycle behavior. |
| Execution reports | ExecutionReport (35=8) and OrderCancelReject (35=9) responses, status mapping, and report fields. |
| Reject codes | Public reject-code families and common actionable error codes returned in Text (58). |
Contract conventions
| Convention | Description |
|---|---|
| FIX version | The interface uses FIX 4.2 over TCP/IP. Use BeginString (8)=FIX.4.2. |
| Message delimiter | FIX fields use the standard tag=value<SOH> format. <SOH> is ASCII 0x01. |
| Required flag | Y means the field is mandatory for the documented message. N means the field is conditional or optional. |
| Timestamp format | UTCTimestamp fields use UTC time. |
| Session identifiers | SenderCompID (49) and TargetCompID (56) are assigned during onboarding. Do not infer environment or routing behavior from these values. |
| Error text | Text (58) may contain a pipe-delimited diagnostic value. Parse it as diagnostic text, not as a stable schema. |
Message groups
| Group | Message types |
|---|---|
| Session | Logon (35=A), Heartbeat (35=0), TestRequest (35=1), ResendRequest (35=2), Reject (35=3), SequenceReset (35=4), Logout (35=5) |
| Order entry | NewOrderSingle (35=D) |
| Order management | OrderCancelRequest (35=F), OrderCancelReplaceRequest (35=G) |
| Execution and rejects | ExecutionReport (35=8), OrderCancelReject (35=9) |