A long-short single-instrument mean-reversion strategy on BTCUSDT perpetual futures using 4-hour bars and OHLCV-only data. Trades counter-trend reversion ONLY when an extreme volatility spike (current bar range > 2x the 14-bar ATR) is confirmed by elevated volume (> 1.5x the 50-bar average volume) AND the spike opposes the prevailing 200-bar EMA trend regime. The volume requirement separates true capitulation/exhaustion bars from thin-volume noise — directly addressing the failure mode of naive single-bar reversal patterns (e.g., the SUI lower-low reversal that produced PF 0.83 on 221 trades because it had no volume confirmation). The trend filter ensures we only fade spikes that conflict with the prevailing direction (sharp down spike in an uptrend = buy-the-dip; sharp up spike in a downtrend = relief-rally fade). BTCUSDT 4H is chosen for: (a) deep liquidity making spike+volume signals meaningful, (b) ~2,190 bars/year producing an estimated 80-200 trades/year for statistical validity (vs the ~5/year that killed the BTC daily compression breakout), (c) no supplementary data required (avoiding the list/dict parsing bugs that killed ETH OI Divergence). Strategy is intentionally minimal: 3 indicators (ATR, vol-MA, EMA), 4 numeric parameters, fixed R:R exit. Expected hold: 1-4 bars (4-16 hours).