When trading contracts, the funding fee is usually an amount you pay or receive after holding a position. This time, Boros turned the rate difference between two platforms into a standalone trading asset. On October 15, Spread Markets launched, initially covering ETH and BTC, allowing users to trade the funding rate difference between platforms with a single position. No need to juggle multiple positions anymore—the rate difference itself can still widen, narrow, or even reverse. First, separate the validation of price predictions and rate difference predictions. Since the trading target has changed, the original reasoning for judging price movements can't be directly applied.