Financial Information eXchange (FIX) protocol connectivity for institutional trading on LX

FIX Protocol

Contact: [email protected] | +1-833-LUX-TRADE | FIX Certification Portal

Overview

LX provides full FIX protocol support for institutional clients requiring standardized electronic trading connectivity. Our FIX implementation enables seamless integration with existing trading infrastructure, order management systems (OMS), and execution management systems (EMS).

Supported FIX Versions

Version	Status	Use Case	Specification
FIX 4.2	Supported	Legacy systems, simple order flow	FIX 4.2 Spec
FIX 4.4	Recommended	Standard institutional connectivity	FIX 4.4 Spec
FIX 5.0 SP2	Supported	Advanced features, FIXML	FIX 5.0 SP2 Spec
FIXT 1.1	Supported	Transport layer for FIX 5.0	FIXT 1.1 Spec

Recommendation: Use FIX 4.4 for new integrations. It provides the best balance of feature support, industry adoption, and implementation simplicity.

Architecture

+------------------------------------------------------------------+
|                     LX FIX ARCHITECTURE                       |
+------------------------------------------------------------------+
|                                                                    |
|  CLIENT INFRASTRUCTURE                                             |
|  +--------------------+    +--------------------+                  |
|  |  Order Management  |    |  Execution Mgmt    |                  |
|  |  System (OMS)      |    |  System (EMS)      |                  |
|  +----------+---------+    +----------+---------+                  |
|             |                         |                            |
|             +------------+------------+                            |
|                          |                                         |
|                          v                                         |
|  +----------------------------------------------------------+     |
|  |                    FIX ENGINE                             |     |
|  |  QuickFIX/J | QuickFIX/n | Custom Implementation          |     |
|  +----------------------------------------------------------+     |
|                          |                                         |
|                          | FIX 4.4 / TCP-TLS                       |
|                          |                                         |
+------------------------------------------------------------------+
|                          v                                         |
|  +----------------------------------------------------------+     |
|  |                 LX FIX GATEWAY                        |     |
|  |  +----------+  +----------+  +----------+  +----------+  |     |
|  |  | Session  |  | Message  |  | Order    |  | Market   |  |     |
|  |  | Manager  |  | Router   |  | Router   |  | Data     |  |     |
|  |  +----------+  +----------+  +----------+  +----------+  |     |
|  +----------------------------------------------------------+     |
|                          |                                         |
|                          v                                         |
|  +----------------------------------------------------------+     |
|  |              LX MATCHING ENGINE                       |     |
|  |                   487ns Latency                           |     |
|  +----------------------------------------------------------+     |
|                                                                    |
+------------------------------------------------------------------+

Connection Endpoints

Production

Region	Primary	Backup	Port
US East	fix.lux.network	fix-dr.lux.network	5001
EU West	fix-eu.lux.network	fix-eu-dr.lux.network	5001
APAC	fix-ap.lux.network	fix-ap-dr.lux.network	5001

Sandbox (Testing)

Environment	Endpoint	Port
Sandbox	fix-sandbox.lux.network	5001
Certification	fix-cert.lux.network	5001
UAT	fix-uat.lux.network	5001

Session Configuration

# Sample QuickFIX configuration
[DEFAULT]
ConnectionType=initiator
ReconnectInterval=30
HeartBtInt=30
StartTime=00:00:00
EndTime=23:59:59
UseDataDictionary=Y
DataDictionary=FIX44.xml

[SESSION]
BeginString=FIX.4.4
SenderCompID=YOUR_SENDER_ID
TargetCompID=LXDEX
SocketConnectHost=fix.lux.network
SocketConnectPort=5001
SSLEnable=Y
SSLProtocols=TLSv1.2,TLSv1.3

Message Flow

Order Lifecycle

Client                          LX FIX Gateway
   |                                    |
   |  Logon (A)                         |
   |----------------------------------->|
   |                                    |
   |  Logon (A) - Confirmed             |
   |<-----------------------------------|
   |                                    |
   |  NewOrderSingle (D)                |
   |----------------------------------->|
   |                                    |
   |  ExecutionReport (8) - New/Ack     |
   |<-----------------------------------|
   |                                    |
   |  ExecutionReport (8) - Filled      |
   |<-----------------------------------|
   |                                    |
   |  Heartbeat (0) <---------------->  | (every 30s)
   |                                    |
   |  Logout (5)                        |
   |----------------------------------->|
   |                                    |
   |  Logout (5) - Confirmed            |
   |<-----------------------------------|

Supported Message Types

Session Level

MsgType	Name	Direction	Description
0	Heartbeat	Both	Keep-alive message
1	TestRequest	Both	Request heartbeat
2	ResendRequest	Both	Request message retransmission
3	Reject	Both	Session-level reject
4	SequenceReset	Both	Reset sequence numbers
5	Logout	Both	Terminate session
A	Logon	Both	Establish session

Application Level - Orders

MsgType	Name	Direction	Description
D	NewOrderSingle	Client -> LX	Submit new order
F	OrderCancelRequest	Client -> LX	Cancel order
G	OrderCancelReplaceRequest	Client -> LX	Modify order
H	OrderStatusRequest	Client -> LX	Query order status
8	ExecutionReport	LX -> Client	Order acknowledgment, fill, reject
9	OrderCancelReject	LX -> Client	Cancel/replace rejection
j	BusinessMessageReject	Both	Business logic rejection

Application Level - Market Data

MsgType	Name	Direction	Description
V	MarketDataRequest	Client -> LX	Subscribe to market data
W	MarketDataSnapshotFullRefresh	LX -> Client	Full book snapshot
X	MarketDataIncrementalRefresh	LX -> Client	Book updates
Y	MarketDataRequestReject	LX -> Client	Subscription rejection

Application Level - Drop Copy

MsgType	Name	Direction	Description
AE	TradeCaptureReport	LX -> Client	Trade notification
AD	TradeCaptureReportRequest	Client -> LX	Request trade history
AQ	TradeCaptureReportRequestAck	LX -> Client	Request acknowledgment

Quick Start

1. Obtain Credentials

Contact institutional sales to receive:

SenderCompID
TargetCompID
API credentials for authentication
FIX data dictionary (customized)

2. Configure Session

// QuickFIX/J Example
SessionSettings settings = new SessionSettings("fix-config.cfg");
MessageStoreFactory storeFactory = new FileStoreFactory(settings);
LogFactory logFactory = new FileLogFactory(settings);
MessageFactory messageFactory = new DefaultMessageFactory();
Application application = new LXDEXApplication();

Initiator initiator = new SocketInitiator(
    application,
    storeFactory,
    settings,
    logFactory,
    messageFactory
);

initiator.start();

3. Send Test Order

// Create NewOrderSingle
NewOrderSingle order = new NewOrderSingle(
    new ClOrdID("ORD-" + System.currentTimeMillis()),
    new Side(Side.BUY),
    new TransactTime(),
    new OrdType(OrdType.LIMIT)
);

order.set(new Symbol("BTC-USD"));
order.set(new OrderQty(1.0));
order.set(new Price(50000.00));
order.set(new TimeInForce(TimeInForce.DAY));

Session.sendToTarget(order, sessionID);

Performance Specifications

Metric	Value
Gateway Latency	< 50 microseconds
Message Processing	< 10 microseconds
Max Messages/Second	100,000
Max Sessions/Client	10
Max Orders/Second	10,000
Heartbeat Interval	30 seconds (configurable)

Security Requirements

Requirement	Specification
Transport	TLS 1.2 or TLS 1.3 required
Authentication	SenderCompID + Password + IP whitelist
Encryption	AES-256-GCM
Certificate	Client certificate optional
IP Whitelist	Required for production

Documentation Sections

Quick Start: Connect in 15 minutes with step-by-step guide
Sessions: Session management, logon, heartbeat, logout
Orders: NewOrderSingle, Cancel, Modify messages
Execution Reports: Fills, rejects, and order status updates
Market Data: Subscribe to real-time market data via FIX
Drop Copy: Trade capture and reporting
Tag Reference: Complete FIX tag documentation
Testing: Certification process and testing tools
Examples: Sample messages and code examples

Support

Channel	Contact
FIX Technical Support	[email protected]
FIX Certification	[email protected]
24/7 Trading Desk	+1-833-LUX-TRADE
Status Page	https://status.lux.network/fix

FIX Protocol

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