Every derivatives contract has key metrics that directly affect your trading. Open Interest tells you the total size of the market and helps gauge participation. The Funding Rate is the cost or income of holding a perpetual swap position over time. The Calculator lets you model any trade before risking capital.
Open Interest = total number of contracts currently open on the exchange (denominated in USD and BTC)
Funding Rate = periodic payment between longs and shorts to keep perpetual swap price near spot
Positive funding = longs pay shorts (market is bullish; long positions are crowded)
Negative funding = shorts pay longs (market is bearish; short positions are crowded)
Funding is paid every 8 hours on most exchanges — factor this into any multi-day leveraged trade
Lesson
Funding Rate and Open Interest — What They Tell You
Open Interest and Funding Rate are two of the most important sentiment and cost metrics in derivatives trading. Rising OI with rising price confirms a trend with participation. Rising funding means crowded longs are paying an increasing cost to hold. Ignoring funding on multi-day positions can silently consume a large portion of total profits.
Open Interest (OI): total active contracts outstanding; rising OI in a trend = new money entering confirming the move; falling OI = positions closing
OI + Price Rising: bullish confirmation — new longs entering; trend has genuine participation
OI + Price Falling: bearish confirmation — new shorts entering; selling has genuine participation
Positive Funding: market is bullish; longs pay shorts every 8H; cost erodes long position margins over time
Negative Funding: market is bearish; shorts pay longs every 8H; actual payment received by long holders
Calculator: input entry, exit, position size → get liquidation price, P&L, and required margin before entering
Always check funding before planning any multi-day leveraged position — multiply rate × number of 8H periods
Check Yourself
The funding rate on a perpetual swap is currently +0.05% per 8-hour period and the market has been bullish for several weeks. What does this mean for a long position held for 5 days?
The long position pays funding to shorts every 8 hours — over 5 days (15 funding periods) this cost erodes the margin and reduces total profit
The long position receives funding payments from shorts — positive funding means longs are compensated for holding in a bullish market
Funding is irrelevant for positions held under 30 days — only long-term swing trades are meaningfully affected by the funding mechanism
Answer it (with a live chart) in the interactive lesson.
Liquidity Theory · Learn · Analyze · Trade together Educational content only — trading involves substantial risk and most beginners lose money. Nothing here is financial advice.