This is an upgraded version of the OKX limit order for spot traders. It shouldn't be used as an investment. If you intend to buy at a certain price level and are willing to hold the position long-term, then a dual-currency limit order is significantly better than a single naked limit order: both involve waiting, but one yields zero return, while the other generates a premium. Price tiers are tools for expressing opinions. From a 2% drop to a 30% drop, the annualized return decreases from 35% to 5.6%. The deeper your bullish outlook, the higher the tier you choose.