The IEX top of book quote feed (TOPS), is a direct data feed product provided for free by IEX. TOPS provides IEX's aggregated best quoted bid and offer position in real-time for all securities on IEX's displayed limit order book.
Displaying real-time prices in an application and using them in financial analytics adds real insight for customers and users but the big exchanges that traditionally provide "tick" prices charge outrageous prices. They have a monopoly and they charge like they know it. Even worse, forget about redistribution- get ready to pay for every user in addition to paying for the data. The IEX Real-Time Security Tracker breaks the mold, allowing developers and analysts to pay just for the stocks they want to cover in real-time and includes the option to redistribute that data to end users. IEX real time prices represent the bid, ask, and last price data-points from the Investors Exchange (IEX).
IEX is a fair, simple and transparent Stock Exchange. IEX is dedicated to institutionalizing fairness in the markets, and provides a fair exchange for investors via a simplified market structure design and cutting-edge technology.