FIX Engine
Ultra Low Latency Java FIX Engine
The OnixS ultra low latency Java FIX Engine is a high performance implementation of the FIX Protocol in Java with an open and extensible API.

- Home
- Products
- FIX Engine
- Java FIX Engine
Main Features
- Easy-to-use API
- High throughput, low latency performance for Direct Market Access (DMA), High Frequency Trading (HFT) and Algorithmic Trading applications
- Rich set of sample applications and quick start venue-specific reference implementations
- Comprehensive documentation
- FAST 1.1 and FAST 1.2 decoding and encoding
- SSL encryption
- Supplied as a Java class library (JAR)
- Supports multiple FIX sessions simultaneously
- Supports multiple FIX Protocol versions simultaneously
- Support all current FIX Protocol versions (4.0, 4.1, 4.2, 4.3, 4.4, 5.0, 5.0 SP1, 5.0 SP2, FIXML)
- Supports all tag and message types of each FIX Protocol version (equities, fixed income, derivatives, FX etc)
- Flexible support of user-defined tags and user-defined message types
- Configurable validation of required fields
- Persistence (the ability to log data to a flat file and restore the state after fail-over)
- Supports FIX dialects (different interpretations of FIX Protocol) on a per-session bases
- Session Scheduler
- Versatile diagnostics: easily track FIX session activity with a full audit trail
- Flexible licensing: you only pay on first production use
- Source Code Escrow
- Service Level based support with included updates and upgrades
- No costs for development, test, UAT and DR licenses used in support of production deployment(s)
- DORA-Ready support aligned to Regulation (EU) 2022/2554 (DORA) for critical ICT services. OnixS offers contractually defined SLAs, incident response, and resilience commitments providing a single accountable partner to meet regulatory obligations.
The OnixS Java FIX Engine SDK includes the Engine library, documentation, and source Java samples for evaluation, education and testing:
- Buy Side (Trading Client) with an optional SSL encryption
- Sell Side (Exchange Emulator)
- FIXML converter
- Latency benchmark test
- Throughput benchmark test
- FAST benchmark tests
- Session Scheduler

