According to @ai_9684xtpa, traders should be aware of a key difference in how Open Interest (OI) is calculated between derivatives exchanges Hyperliquid and Binance. Based on tests by @dotyyds1234 and an official reply from @BinanceFutures, Hyperliquid calculates OI by summing both long and short positions, effectively double-counting. In contrast, Binance calculates OI by counting each matched long and short pair only once. When applying Binance's standard methodology, Hyperliquid's comparable Open Interest is $308 million, while Binance's is $169 million. This discrepancy is critical for traders assessing market liquidity and sentiment on different platforms.