IEX shot to fame as the private trading venue, also known as a dark pool, which challenged high frequency traders who it believed were rigging the $24 trillion (£18 trillion) US stock market in Lewis' book published in 2014.
High frequency trading (HFT) uses computer algorithms to make vast numbers of big, ultra-fast trades. Critics say this gives them an unfair advantage, but others believe it improves liquidity and makes prices more accurate.
Now, IEX wants to do the same in the more than $5 trillion-a-year gold market with a new exchange being created by its spinoff TradeWind Markets, Reuters reported.
Matt Harris, a managing director at Bain Capital Ventures which has an investment in IEX, told Reuters that the group is planning a gold exchange using elements of blockchain technology to improve transparency.
Blockchain technology processes transactions for all members of a database almost in real-time. Crucially, it cannot be tampered with, because complex mathematical equations prevent it from being faked or manipulated.
Harris said of the gold market: "It's too slow, it's opaque as to who owns what and when along the way, and there's lots of room for error that requires manual reconciliation.
"A system that was instantly self-reconciling and 100 per cent transparent would solve a lot of problems."