Trading bots do this fairly, and automatically

Laura Keller at Bloomberg look at the new apps that send encrypted messages.  Wall Street is using them to share book, on an ad hoc basis.  Evidently the rules do not  allow this, it is called price fixing.

The sandbox does it differently. We skip the human, and replace with the trading bot.  The 'trade book' is equally observable by all, to the specified precision.  .Then the pit boss is generally profitless but prices are auto compressed to make the market.

Bloomberg: Dirty jokes and NSFW GIFs. Snaps of unsuspecting colleagues on the trading floor. Screenshots of confidential client positions.All that -- and, on occasion, even legally dubious information -- is increasingly being trafficked over the new private lines of Wall Street: encrypted messaging services like WhatsApp and Signal.From traders to bankers and money managers, just about everyone in finance is embracing these apps as an easy, and virtually untraceable, way to circumvent compliance, get around the HR police and keep bosses in the dark. And it’s happening despite the industry’s efforts to crack down on unmonitored communications, according to conversations with employees at more than a dozen of Wall Street’s most recognizable firms.