01 — Transparency
The record should survive.
Public protocol specifications and test data should remain public and discoverable, even after a feed is retired.
Democratizing
access to modern electronic markets.
Protocols are normalized as intermediate binary representations, then compiled into Wireshark dissectors, C, C++, C#, and Java. One model, every venue, every language.
- 35
Financial organizations
Nasdaq, NYSE, CME, CBOE, LSE, HKEX and more
- 54
Wire protocols documented
Market data, order entry, encoding formats
- 5
Generated output targets
Lua · C · C++ · C# · Java — all source-generated
- MIT
Open source license
Free to use, modify, and distribute
Directory
The catalog
A curated index of public protocol specifications, sample data, and reference material. These are collected from publicly available sources and preserved so the historical record survives even when exchanges retire or rename their feeds.
Principles
Philosophy
OMI is market-neutral. We do not take sides between exchanges, brokers, trading firms, or technology providers. We do hold positions on two things:
02 — Best practices
Code quality is non-negotiable.
Source code in the OMI ecosystem follows automated builds, regression testing, clean code, and SOLID principles.
Technology · Scaled Sources
The compiler
Each venue's published specification is normalized into a universal binary protocol model, then compiled into target-language artifacts — one model, every language. The compiler is developed by Scaled Sources and contributed to OMI as open source.
Powered by Scaled Sources
spec/
*.xml , *.fix
normalize
universal binary
protocol model
compile
back-end
targets
- *.luawireshark-lua
- *.hc-structs
- *.csCSharp.Packed.Structs
- *.javaomi.java.protocol.classes
Every output language is a backend on the same model — fix the model once, regenerate every downstream artifact.
Contribute
Need a protocol added?
Send us the spec and any pcap captures you have (pcaps are optional). We'll add it to the Directory and generate the corresponding Wireshark dissector, C structs, C# classes, and Java classes.
requests@openmarketsinitiative.com- 01
Send us the spec
Share the exchange's published specification — XML, FIX, PDF, or a link to their docs.
- 02
Include pcaps if you have them
Packet captures speed up validation but are never required to submit a request.
- 03
We handle the rest
We normalize, compile, and publish it to the Directory.
OMI is open source,
built with the community.
Everything OMI produces is free, MIT-licensed, and community-driven. Browse the full catalog, contribute a protocol, or just start building.