# Integral APIs

REST API
API based on RESTful principles with simple request and response structure.

WebSocket API
Real-time market data with the performance and management advantages of bi-directional, full-duplex, event-driven communication between client and server.

FIX API
Use the FIX protocol to access a global real-time system of liquidity providers and liquidity takers that provides the most robust and lowest cost means of electronically connecting leading market participants amongst each other.