Insights : OnixS

Accessing CME market data with OnixS and Databento

Written by Admin | Oct 1, 2025 11:29:59 AM

When trading on the Chicago Mercantile Exchange (CME), speed and accuracy in market data are essential. Whether you’re building a low-latency trading strategy or backtesting complex models, you need a way to connect directly to CME’s market data feeds without unnecessary complexity.

That’s where the combination of OnixS directConnect SDKs and Databento’s CME market data feeds comes in - offering a streamlined, high-performance path to the CME Globex MDP 3.0 data you need.

 

CME APIs and market data feeds explained

 

Databento offers a range of data access options:

  • Live market data APIs for real-time trading

  • Historical data APIs for analysis and backtesting

  • Packet capture (PCAP) files for accurate replay of market conditions

OnixS’s CME MDP Premium Market Data Handler SDKs are built to work directly with these formats, giving developers low-latency, high-throughput access to the CME’s full market data model.

 

How OnixS directConnect works with CME data

 

The OnixS directConnect SDK supports integration in C++, .NET, and Java, and is optimised for deterministic performance. Key benefits for CME users include:

  • Direct Market Access with ultra-low latency SBE decoding

  • Market data logging and replay for testing and optimisation

  • Source code examples for rapid deployment

  • Flexible licensing and deployment options

When paired with Databento CME PCAPs, you can quickly feed captured market data into OnixS for replay, analysis, or integration into automated trading systems.

 

Why this matters for trading teams

 

Combining CME market data feeds from Databento with OnixS directConnect APIs means less engineering overhead and faster time to market for trading strategies. Instead of building custom connectors, you can leverage a proven, pre-certified solution that’s already used by some of the world’s top trading firms.

For quant developers, market makers, and fintech teams, that means:

  • Faster strategy iteration

  • Reliable, low-latency performance

  • Seamless integration from data to execution

Explore the integration

 

To learn more about using OnixS with CME market data from Databento, explore our CME market data handler SDK or speak to our team about the best setup for your trading environment.