A simple on/off switch for U.S. stocks using the momentum of shipping‑rate ETF BDRY: when BDRY’s 60‑day RSI is above 50, hold SPY; otherwise sit in T‑Bills (BIL). Checked and rebalanced daily.

Each day the strategy checks BDRY’s 60‑day RSI—a 0–100 score of recent gains vs. losses. BDRY tracks dry‑bulk shipping rates, a rough read on global trade. If RSI > 50 (uptrend), it holds SPY (U.S. stocks). Otherwise it holds BIL (short‑term T‑Bills). Rebalanced daily.

Out-of-sample, this RSI-based risk-on/risk-off strategy beats SPY on risk-adjusted return: Sharpe 1.80 vs 0.85; Calmar 3.73; max drawdown ~3% vs ~19%. It participates in up markets while dramatically limiting losses.