A DOLLAR-NEUTRAL, MULTI-INSTRUMENT cross-sectional strategy on ~8 liquid BINANCE USD-M major perps (BTC, ETH, SOL, BNB, XRP, ADA, AVAX, LINK — all SAME venue, so no L44 cross-venue leg-availability problem; OI coverage on USD-M majors is confirmed multi-year, e.g. the ETH single-name OI hypothesis produced a full backtest). It deliberately builds on the factory's ONE proven survivor archetype — cross-sectional relative-strength momentum on perps (the deployed Sharpe-2.6 strategy) — but differs on three axes that address why recent attempts died: (1) it is DOLLAR-NEUTRAL long-short, stripping the crypto beta that blew up the long-only spot-rotation variants (81% DD, negative expectancy) and filling the under-represented long-short bucket (13.4%); (2) the ranking is not pure price — it CONFIRMS each name's return momentum with its OPEN-INTEREST growth, an orthogonal flow signal (L42-compliant), so we prefer moves backed by fresh capital (which persist) over moves on contracting OI (which fade); this cross-sectional aggregation across 8 names raises the OI signal-to-noise that made the SINGLE-instrument OI-trend strategy near-zero and fee-fragile; (3) BI-WEEKLY rebalance keeps turnover very low, so the ~0.20% two-side round-trip fee is amortized over multi-percent relative moves. It is distinct from every pending hypothesis (all single-instrument or a 2-leg funding pair) and from the dead cross-sectional betting-against-beta (that ranked by realized beta and found no edge; this ranks by OI-confirmed momentum, the proven-direction signal). Market-neutral cross-sectional momentum is the single most robust edge this factory has found; adding an orthogonal OI confirmation and neutralizing beta is a principled improvement, not a new textbook cliche.