A DOLLAR-NEUTRAL, LONG-SHORT cross-sectional SHORT-TERM REVERSAL basket traded entirely on Hyperliquid perpetuals (venue HYPERLIQUID, which the portfolio is under-weight at 7.1% vs a >=20% target, and long_short direction is under-weight at 15.7% vs a <=55% cap). Universe = ~8 liquid HL majors (BTC, ETH, SOL, BNB, DOGE, AVAX, LINK, ARB) on 4H bars. 4H on Hyperliquid has ~2.3 years of usable candle history (well inside the HL sub-hourly data wall — this is deliberately NOT a 1m/5m/15m HL design), so it validates on multi-year data. This is MECHANISTICALLY ORTHOGONAL to the cross-sectional MOMENTUM basket already in the pipeline: it uses the OPPOSITE sign and a much SHORTER lookback (trailing 1-day return), betting on mean-reversion of overextension rather than trend continuation. The premise is a documented crypto short-term-reversal / overreaction effect that should be STRONGER on Hyperliquid specifically: HL is a retail-flow-heavy, momentum-chasing venue whose funding and price frequently overshoot on 1-day horizons, creating transient dispersion in the cross-section that reverts once the crowd rotates. Dollar-neutral construction (equal long and short notional) strips out market beta, so the P&L is the relative reversion spread, not a directional bet — this is the key defense against the single-asset-trend and directional-funding failure modes that killed prior hypotheses. Low-parameter by design (lookback, dispersion gate, hold, leg count) to resist the overfitting/deflated-Sharpe rejections that recur in the portfolio.