SPXW · Backtest unavailable
Same-day options (0DTE).
Data unavailable
Massive denied this API key access to daily and minute history of I:SPX (403). Historical SPXW option quotes are available, but native index prices are required to select ATM strikes and verify the previous-session signal. SPY prices are not substituted.
SPXW is a PM-settled option series on the S&P 500 index, not a second SPY ETF. These options are European-style, cash-settled, with a $100 multiplier per index point. SPXW results have not been calculated and are excluded from aggregate results.