Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time
September 22, 2022 11:41
October 26, 2021 17:52
September 18, 2015 10:40
August 3, 2020 19:47


This project contains specifications and resources for Simple Binary Encoding (SBE). SBE is a FIX standard for binary message encoding.


application/sbe has been registered as a media type (formerly MIME type) at Internet Assigned Numbers Authority (IANA). A media type defines the format of the contents of an Internet message.

Protocol stack

SBE is part of a family of protocols created by the High Performance Working Group of the FIX Trading Community. SBE is a presentation layer protocol (layer 6).


Planned Lifecycle

The planned lifecycle of this project is to roll out new features in a series of release candidates. After each release candidate is approved, it will be exposed to public review. Issues may be entered here in GitHub or in a discussion forum on the FIX Trading Community site. When a version is considered complete, the last release candidate will be promoted to Draft Standard. Following further public review, a Draft Standard may be promoted to the final specification for that version. Only minor errata are permitted. To reach the final stage, the Draft Standard must be reviewed for no less than 6 months, and at least two interoperable implementations must be certified. That version is henceforth immutable.

SBE version 1.0 has reached the final technical specification stage while release candidates have been developed for proposed version 2.0.

Version 2.0 Release Candidate 2

Version 2.0 RC2 was approved by the Global Technical Committee on August 15, 2019 for 90 day public review.

Themes of this release:

  • Clarification about single-byte character sets
  • Improvement of the XML schema, including support for XInclude

Version 2.0 Release Candidate 1

Version 2.0 RC1 was approved by the Global Technical Committee on August 16, 2018 for 90 day public review. Features were added due to popular demand. Because it is not interoperable with version 1.0 due to minor wire format changes, it was designated as a major version.

Themes of this release:

  • Further enhancements to the schema extension mechanism
  • Improvement of the XML schema

Version: 1.0 Technical Specification

Version 1.0 Draft Standard was promoted to SBE version 1.0 Technical Specification by the Global Technical Committee on Feb. 9, 2016. This is the final specification of version 1.0.

The standard met these criteria for promotion:

  • More than 6 months public review. During the period, some minor errors were found, and the errata were incorporated into the final specification. Thanks to users who detected those errors.

  • At least two interoperable implementations. This was demonstrated with the conformance test suite described below.

SBE standards are available here in GitHub and on the FIX Trading Community site.

SBE version 1.0 specification with errata was posted July 27, 2018.

XML namespace

The XML namespace for SBE version 1.0 message schemas is


All users are encouraged to contribute, especially by reviewing proposed changes in the form of pull requests. Your feedback counts.

Interested parties who wish to participate in the FIX High Performance Working Group should contact and state that your interest is in SBE, which sometimes meets as a subgroup. Membership in FIX Trading Community is not required to participate in technical working groups.

Conformance test suite

The SBE Conformance project provides a conformance test suite to verify interoperability of SBE implementations. All implementors are invited to demonstrate their conformance to the standard.


FIX Simple Binary Encoding specifications are © Copyright 2014-2020 FIX Protocol Ltd.

Creative Commons License
FIX Simple Binary Encoding by FIX Protocol Ltd. is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.
Based on a work at