Polymarket has launched perpetual futures contracts tied to oil, stepping into a market that rival Kalshi Inc. is also seeking to enter as trading venues compete to offer round-the-clock access to the commodity. The company announced the launch Thursday as part of a broader rollout of perpetual futures spanning crypto, stocks and commodities including gold and silver. Among them are two never-expiring contracts linked to the Brent and West Texas Intermediate oil benchmarks, a type of derivative facing scrutiny over its potential impact on price discovery in physical markets.