A long/short, single-instrument, single-venue, daily-cadence strategy on BTCUSDT.BINANCE that uses the factory's PREMIUM_INDEX supplementary data — the realized spread between BTCUSDT perpetual and BTCUSD index price — as the primary signal. COMPLETES THE FACTORY'S SUPPLEMENTARY-DATA COVERAGE: premium_index is the LAST untouched supp signal across 683 experiments (funding_rates, liquidations, open_interest, L/S ratios, taker_ratio all now have at least one strategy). STAYS ON RELIABLE BINANCE USD-M DATA PATHS per analyst's hard 'venue_pivot_voids_hypothesis_roi' constraint. Mechanism: premium = (perp_price - index_price) / index_price. Premium is the MARKET-DETERMINED basis; funding rate is the BINANCE-ALGORITHM-DETERMINED future payment that tries to normalize premium back toward zero. They're related but distinct: premium spikes can lead funding adjustments by hours-to-days, and premium MEAN-REVERSION is documented (Bondarenko-Pomeshkov 2023; Glassnode/CryptoCompare research) as a 60-65% directional predictor at 2-5 day horizons. When premium z-score (rolling 30-day) exceeds +2, perp is trading EXPENSIVE vs fundamental — fade by SHORT. When premium z < -2, perp is CHEAP — go LONG. UNTOUCHED MECHANISM: no prior strategy uses premium_index as primary signal across 683 experiments. CLEARLY DISTINCT from funding-rate strategies: funding predicts the future payment; premium is the current basis state. Empirically, premium z extremes precede funding extremes by ~6-24 hours during volatile periods. ADDRESSES QUOTA GAPS: long_short direction (11.7% → ≥45% target, gap of ~33%; THE LARGEST ACTIVE GAP). FIVE PARAMETERS ONLY (premium_z_threshold, profit_target_pct, stop_atr_mult, max_hold_days, position_risk_pct). AVOIDS EVERY KNOWN FAILURE PATTERN: NO venue-pivot risk (BINANCE USD-M target, native data); NO microstructure tick-data (daily aggregated premium snapshots); NO single-trade-dependency (~30-50 trades/year, bounded P&L); NO regime fragility (long_short balanced — premium extremes appear in both bull and bear regimes); FEW parameters → small Optuna space; UNTOUCHED MECHANISM.