PERPETUAL FUTURES & FUNDING RATES
Plain English
Crypto perpetual futures are the most popular trading instrument in crypto — no expiry date, just trade forever. The 'funding rate' is paid every 8 hours to keep the perpetual price anchored to spot. When crypto is in a bull market and everyone wants to be long, longs pay shorts. When bears dominate, shorts pay longs. Funding rates are one of the best sentiment indicators in crypto.
Going deeper
Perpetual futures (perps) are derivative contracts that never expire, unlike traditional futures. They track the spot price through a funding mechanism. Funding rate: paid every 8 hours between long and short holders. When perp price > spot price: longs pay shorts (positive funding). When perp price < spot price: shorts pay longs (negative funding). Rate is set by market imbalance — if 80% of open interest is long, funding rate rises to incentivize more shorts. Typical funding rate: 0.01% per 8 hours = 0.03% per day = ~11% annualized for longs. During bull markets, funding can spike to 0.1-0.3% per 8 hours (110-330% annualized) — meaning leveraged longs pay enormous carry costs. Key exchanges: Binance, Bybit, dYdX (decentralized), Hyperliquid. Leverage: 1x to 125x available, though 2-5x is considered responsible. Liquidation is automatic and swift — at 20x leverage, a 5% adverse move wipes you out. Perpetual funding rates serve as a sentiment gauge: consistently high positive funding = market is overleveraged long = potential liquidation cascade risk.
Examples
Funding Rate as Sentiment Signal
BTC perpetual funding rate hits 0.15% per 8 hours (three times the baseline). This means longs are paying 0.45%/day — annualized, that's 164% to be long. This extreme positive funding signals the market is dangerously overleveraged long. In 2021, spikes to similar levels preceded 15-30% corrections as long positions got liquidated in cascading fashion.
Funding Rate Arbitrage (Cash & Carry)
BTC spot: $70,000. BTC perpetual: $70,200. Funding rate: 0.1% per 8 hours. Strategy: Buy 1 BTC spot and short 1 BTC perpetual simultaneously. If prices move, you're delta-neutral. Every 8 hours, you receive the 0.1% funding as shorts receive payment. $70,000 position earning ~0.1%/8hr ≈ 110% APR with near-zero directional risk. This is delta-neutral funding rate farming.