Darri Eythorsson , Columnist

I Built an AI Trading Platform in Six Days. That’s Terrifying

April 28, 2026 at 10:00 AM UTC

Corrected

April 29, 2026 at 7:03 PM UTC

Darri Eythorsson is a computational hydrologist and research associate at the University of Calgary. He is the lead architect of SYMFLUENCE, an open-source hydrological modeling framework.

How long until there’s nothing but bots?
Photographer: Michael M. Santiago/Getty Images

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A few weeks ago, I sat down at my laptop and built a trading platform. It connects to three financial exchanges. It ingests news from RSS feeds, web searches, Reddit and Twitter. It uses a large language model to analyze markets, estimate probabilities and decide when the price is wrong. It sizes positions using the Kelly criterion. It manages risk across a portfolio. It routes orders intelligently across venues.

The platform runs around the clock without supervision. It is a production-grade system spanning 50 modules — exchange connectors, risk management, natural-language analysis, order routing, portfolio tracking, etc. It trades prediction markets like Polymarket and Kalshi.