FIX API (Financial Information eXchange Application Programming Interface) is a standardized electronic communications protocol for real-time exchange of trade-related information. It is used by institutional traders and algorithmic systems to connect directly to brokers and exchanges for low-latency order execution.
Example
“The quantitative trading firm connected its algorithm to the exchange via FIX API to achieve sub-millisecond order execution, bypassing the broker's web interface entirely for maximum speed.”