Open Interest (OI): What It Measures and Why It Matters

Open interest (OI) is the total number of futures/perpetual contracts that are currently open (not yet closed or settled) across an exchange. It is not the same as trading volume - volume counts every trade, OI only counts positions still standing. Why it matters: rising OI while price rises means new money is entering long positions - the move has real conviction behind it. Rising OI while price falls means fresh shorts are piling in. Falling OI during a price move (in either direction) usually means existing positions are being closed out rather than new ones opened - the move is more about squeezing out old positions than building a new trend. How BTCWEAPON.COM shows it: the OI × Price Matrix card cross-references OI change against price change across Binance, OKX and Bybit at once, so a single-exchange spike (which can be noise, or even a data glitch on one venue) doesn't get mistaken for a market-wide signal.