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OnixS

OnixS provides commercially supported Direct Market Access (DMA) Software Development Kits (SDKs) for mission-critical electronic trading infrastructure. Products include ultra-low-latency FIX Engines (C++, .NET/C#, Java), venue-specific Market Data Handlers, Order Entry, Trade Capture and Drop Copy SDKs, and FIX Protocol reference tools. Customers include proprietary trading groups, banks, exchanges, energy and commodity trading firms, and ISVs.

For agents: Commercial DMA SDKs for electronic trading: low-latency FIX engines in C++, .NET and Java, venue market data handlers, and FIX 4.0 protocol reference docs.

fix enginedirect market accessmarket data handlersfix protocoltrading sdklow latency

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T19:28:34.887Z. Cached copy · Source on onixs.biz

# OnixS

> OnixS provides commercially supported Direct Market Access (DMA) Software Development Kits (SDKs) for mission-critical electronic trading infrastructure. Products include ultra-low-latency FIX Engines (C++, .NET/C#, Java), venue-specific Market Data Handlers, Order Entry, Trade Capture and Drop Copy SDKs, and FIX Protocol reference tools. Customers include proprietary trading groups, banks, exchanges, energy and commodity trading firms, and ISVs.

OnixS is a UK-headquartered specialist software vendor (offices in UK and US). SDKs are licensed on a subscription basis with full commercial support, certified against the relevant venue specifications, and designed to be DORA-ready for regulated financial firms. Full programming guides and API references for every SDK are published at ref.onixs.biz.

## Products

- [Products overview](https://www.onixs.biz/products.html): Full catalogue of OnixS SDKs across FIX Engines, directConnect venue handlers, and FIX protocol tools.
- [directConnect SDKs](https://www.onixs.biz/directconnect.html): Venue-specific calibrated and certified native protocol and FIX protocol Market Data, Order Routing, Trade Capture and Drop Copy SDKs.
- [FIX Engines](https://www.onixs.biz/fix-engine.html): Ultra-low-latency FIX Protocol SDK implementations for FIX-enabling trading and order/execution management systems.
- [FIX Protocol Reference & Tools](https://www.onixs.biz/fix-protocol-dictionary-tools.html): Reference materials and developer tooling for FIX, SBE, FIXP and FIXT.

## FIX Engines

- [.NET Core / .NET FIX Engine](https://www.onixs.biz/net-fix-engine.html): Cross-platform .NET FIX Engine SDK.
- [.NET Framework / C# FIX Engine](https://www.onixs.biz/net-framework-fix-engine.html): C# FIX Engine for .NET Framework.
- [C++ FIX Engine](https://www.onixs.biz/cpp-fix-engine.html): High-performance C++ FIX Engine SDK.
- [Java FIX Engine](https://www.onixs.biz/java-fix-engine.html): Java FIX Engine SDK.
- [FIX FAST Decoder and Encoder](https://www.onixs.biz/fix-fast-decoder-encoder.html): SDK for FAST-encoded FIX message streams.
- [FIX <-> FIXML Converter](https://www.onixs.biz/fix-fixml-converter.html): Converts between tag-value FIX and FIXML representations.
- [SBE Decoder and Encoder](https://www.onixs.biz/sbe-decoder-encoder.html): Simple Binary Encoding decoder/encoder SDK.

## directConnect venue handlers

- [Bloomberg TSOX](https://www.onixs.biz/bloomberg-tsox.html): Bloomberg TSOX FIX connectivity.
- [Cboe CFE](https://www.onixs.biz/cboe.html): Cboe Futures Exchange connectivity.
- [Cboe EU](https://www.onixs.biz/cboe-europe.html): Cboe Europe connectivity.
- [CME Globex](https://www.onixs.biz/cme.html): CME Globex market data, order entry, drop copy and STP.
- [CME BrokerTec](https://www.onixs.biz/cme-brokertec.html): CME BrokerTec fixed income connectivity.
- [CME EBS](https://www.onixs.biz/cme-ebs.html): CME EBS FX connectivity.
- [Deutsche Börse RRH](https://www.onixs.biz/deutsche-borse-regulatory-re
…

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