Definition. OHLC price data for WTI crude oil front-month futures (CL1). WTI is the primary benchmark for U.S. oil prices.

Technical. On non-trading periods (weekends, market holidays, and outside market hours for intraday resolutions), OHLC values are forward-filled from the last trading session's close price. Daily resolution has data since January 2009, intraday resolutions (10m, 1h) have shorter history.