Ultra‑short crypto bets on Polymarket and Kalshi now drive most crypto volume, blurring hedging and gambling as AI bots, HFT firms and retail chase five‑minute wins. Summary Polymarket and Kalshi list five‑ to 15‑minute “up‑down” contracts on BTC, ETH and other coins that already account for more than half of their crypto trading. Retail users lean on AI agents to scrape data and output odds, while HFT firms exploit latency gaps and rich fees as platforms tweak microstructure to curb bots. Regulators still call these tools “hedging” and “portfolio management,” but critics – including Vitalik Buterin – warn prediction markets are drifting into pure gambling. Ultra-short-term crypto bets have exploded on prediction platforms Polymarket and Kalshi, turning markets for bitcoin, ether and other tokens into five-to-fifteen-minute gambling loops for retail traders and high-frequency firms alike. How the Five-minute Contracts Work Both platforms list binary “up-down” contracts on whether prices for bitcoin, ethereum, solana, XRP and other coins will be higher or lower at expiry, with maturities as short as five minutes on Polymarket and 15 minutes on both Polymarket and Kalshi. These short-duration markets now make up more than half of all crypto trading on the two venues, with combined daily volume around 70 million dollars, despite the broader crypto market trading below recent peaks. Retail traders chase quick wins while staring at dashboards that show real-time prices ticking around a “price to beat” as a countdown clock runs to zero. One engineer, Max Wojcik, told the FT he relies on three AI chatbots — Claude, Gemini and ChatGPT — to scrape weeks of price data, debate among themselves and spit out odds before he manually fires his five-minute bitcoin bets, claiming to have doubled his capital in two months. Fees, Arbitrage, and High-frequency Players Polymarket initially allowed latency arbitrage to run wild: sophisticated firms exploited millisecond gaps between its prices and those on Binance, profiting from microstructure inefficiencies in the new 15-minute markets. Amir Hajian of market-maker Keyrock described growth in five- and 15-minute bitcoin options as “explosive”, calling the products “pure speculation” and noting that high-frequency trading firms are active alongside retail punters. To curb bots and extract revenue, Polymarket introduced per-trade fees on 15-minute crypto contracts in January, then moved to extend fees of up to 1.56 per cent across all crypto markets on the platform.Even so, seven-day average volume in the short-term markets has climbed sharply since their October 2025 launch, with no visible slowdown after fees were added. Kalshi, Regulators, and the Push Toward Margin Kalshi, which has rapidly grown its own short-term crypto forwards since introducing them in December 2025, now sees these contracts account for roughly half of its crypto flow, although crypto still represents a modest share of total volume compared with sports and other markets. The company has sought US regulatory approval to add margin trading, but a person familiar with the plans said leveraged bets are not currently envisaged for the 15-minute crypto products. On the regulatory side, Commodity Futures Trading Commission chair Mike Selig, appointed by President Donald Trump, has repeatedly defended event contracts as tools for hedging and portfolio management, even as critics see them drifting closer to gamified betting. Investor advocate Amanda Fischer argues that prediction platforms have taken an already speculative asset class and injected “even more mania” into trading by compressing the time horizon to minutes. TradFi Copies the Crypto Playbook Mainstream exchanges are moving to mimic this structure. Nasdaq has filed to list binary “yes-no” options on whether the Nasdaq 100 trades at, above or below preset levels over short windows. If regulators approve, the exchange may later explore “zero-day” outcome options with expiries of 24 hours or less, importing the prediction-market style race-to-the-clock into traditional equity index trading. Fischer sums up the direction bluntly: everyone is racing to build a superapp that blends speculation, hedging and entertainment in one interface, with traditional finance borrowing heavily from crypto and crypto platforms increasingly mirroring Wall Street.
