The Open Markets Initiative

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The Open Markets Initiative (Omi) is a market-neutral effort to enhance the stability of electronic financial markets through transparency, modern tooling, and open documentation of the wire protocols that connect them.

This Directory is the catalog: a curated index of public protocol specifications, sample data, and reference material spanning 37 financial market organizations and 50 wire protocols — collected from publicly available sources and preserved here so the historical record survives even when exchanges retire or rename their feeds.

Quick Navigation

| Section | What's there | | --- | --- | | Organizations/ | One folder per exchange / venue / regulator — links, MICs, and per-protocol spec entry points | | Protocols/ | One markdown page per protocol — what it is, who runs it, encoding family, transport, and history | | Glossary/ | Common protocol concepts shared across venues | | Projects/ | Index of related Omi GitHub repositories — code generators, dissectors, and research | | Research/ | Academic papers and patents on parser generation, low-latency systems, and binary protocols | | About/ | Mission, philosophy, code of conduct, license |

Coverage

Organizations span US/EU/APAC equities, options, futures, and OTC venues:

24X · A2X · Aquis · Asx · B3 · Boats · Box · BruceAts · Cboe · Cme · Coinbase · Currenex · Eurex · Euronext · Finra · Fix · Hkex · Ice · Iex · Imperative · Jnx · Jpx · Lse · Lseg · Memx · Miax · Nasdaq · Ndfex · NsxAustralia · Nyse · Odx · Omi · Otc · Siac · SmallX · Tmx · Txse

See the organization table for MICs and websites.

Protocols are categorized by role:

| Category | Protocols | | --- | --- | | Encoding | Boe3, Csm, Glimpse, iMpact, Obi, Rake, Sbe, T7, Ultra, Xdp | | Framing | SimpleOpenFrame | | Market Data | Amd, Apf, Ats, Cta, Dfi, Hsvf, Itch, Mach, Mitch, Omd, Pillar, Pitch, Xmt | | Order Entry | Atp, Boe, Ouch, PillarStream, Sail, Seed | | Protocol Suite | Bgw, BinaryEntryPoint, BinaryUmdf, Eobi, Eti, iLink3, Mdf, Mdp3, Opra | | Session | CommonClient, SoupBinTcp | | Transport | BinaryPacket, BinaryPacketHeader, IexTp, MoldUdp, MoldUdp64 | | Trading | Cbp, Gtp |

See the full protocol table for descriptions.

Related Omi Repositories

The Directory is the human-readable catalog. The machine-readable specifications live elsewhere and drive the source-generated artifacts:

Specifications & Data

omi-data-packets — Sample packet captures keyed to the protocols listed here

Source-Generated Outputs (driven from the specifications)

wireshark-lua — Wireshark dissectors in Lua
omi-fix-dictionaries — FIX protocol dictionaries (QuickFIX-format XML, one per FIX version)
c-structs — C-style packed structs
CSharp.Packed.Structs — C# castable packed structs
omi.java.protocol.classes — GC-friendly Java protocol classes

Generators & Tooling

Omi.Fix.Generators — Composable FIX code generators
latency-lab — Composable latency-measurement tools

Reference Material

omi-low-latency-reference — Low-latency programming articles
omi-markets-reference — Markets reference articles and links

A complete list lives in Projects/.

Contributing

Documentation here is collected from publicly available sources. If you spot a stale link, a missing protocol version, or a venue we don't yet cover:

Open an issue describing the gap or correction.
Pull requests adding new organization / protocol entries are welcome — please follow the layout of an existing entry (see any folder under Organizations/ for the template).
Read the Code of Conduct before contributing.

Philosophy

Omi is market-neutral — we do not take sides between exchanges, brokers, trading firms, or technology providers. We do, however, hold positions on two things:

Transparency. Public protocol specifications and test data should remain public and discoverable, even after a feed is retired.
Best practices. Source code in the Omi ecosystem follows automated builds, regression testing, clean code, and SOLID principles.