> For the complete documentation index, see [llms.txt](https://api.sellsides.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://api.sellsides.com/sellsides-fix-api-v.0.6.md).

# SellSides FIX API V.0.6

<figure><img src="/files/dzutkIIobNozhuqeGG5O" alt=""><figcaption></figcaption></figure>

## Document contents

This document provides a comprehensive overview of the Financial Information eXchange (FIX) protocol messages and the workflow associated with Sell-Side FIX API connections. The FIX protocol is a messaging standard for the real-time electronic exchange of securities transactions. It is widely used by financial institutions, including banks, brokers, and exchanges, to facilitate the automation of trade execution, pre-trade risk management, and post-trade processing.

The API documentation detailed herein is designed to guide developers and system integrators through the process of establishing and maintaining a FIX API connection from the client perspective.&#x20;

It outlines the specific messages that are exchanged, and the sequence of events that occur during the lifecycle of an order, and the error handling procedures.

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This API documentation is intended for technical audiences, including software developers, system administrators, and compliance officers who are responsible for implementing and monitoring FIX API connections. It assumes a basic understanding of financial markets and the FIX protocol.
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**Important notice:** FIX messages fileds usage is subject to change. API users shall be notified prior to FIX API update.
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