FIX Protocol

The ubiquitous messaging standard for real-time electronic communication in global financial markets.

FIX (Financial Information eXchange) is the backbone of institutional trading, powering over 85% of global market volume. It provides a non-proprietary, free, and open language for the automated execution of equities, derivatives, and foreign exchange. By standardizing message formats (like Tag 35 for message type or Tag 55 for symbol), it eliminates the friction of custom API development between buy-side firms, sell-side brokers, and exchanges like the NYSE or NASDAQ. Whether you are routing a limit order or confirming a multi-million dollar trade, FIX ensures the data arrives with sub-millisecond precision and absolute semantic clarity.

https://www.fixtrading.org