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Contracts traded per session — calls vs puts — with the notional value behind them.
Volume is contracts. Cboe reports SPX and SPXW as one combined line (“SPX + SPXW”), so these figures include monthly SPX as well as the weekly/0DTE SPXW series.
Traded value is notional — contracts × 100 × that day’s SPX close — the index exposure that changed hands, not the premium paid. Premium isn’t in Cboe’s public daily file and is a small fraction of notional.