How shorts work in crypto
Perpetual futures (by far the most common): you sell the perp contract without having borrowed anything. Your P&L is the entry price minus the current price, multiplied by the notional. The funding rate mechanism compensates the other side — in a bull market, longs typically pay shorts negative funding (shorts receive payments every 8 hours), which is a passive cost of holding.
Spot margin shorts: you borrow BTC from an exchange’s lending pool, sell it, and aim to buy it back cheaper later. You pay interest on the borrow. Returns are generally lower than perp shorts because the mechanics require a spot sale and rebuy.
On-chain shorts: GMX, Perennial, dYdX, and Hyperliquid offer perpetual-style shorts on-chain. The mechanics match CEX perps but trust moves from an exchange operator to a set of smart contracts and oracles.
When shorting makes sense
- Hedging a long spot position through a known catalyst (hedge-style shorts).
- Expressing a specific bearish thesis — a token’s unlock schedule, a protocol exploit aftermath, a bank-run pattern.
- Capturing negative funding — in extreme bull markets, funding can pay shorts 30%+ annualized, which compensates for modest losses even if the directional call is wrong.
Risks and considerations
The asymmetric risk is famous but bears repeating: a long can lose 100%, a short can lose infinite percent in principle (the asset can rally 10x). In crypto, short squeezes are frequent and violent — an asset with high short interest can triple in hours as liquidations force buy-side flow. Positive funding rates bleed short positions during strong rallies, sometimes faster than the underlying trend. And shorts on low-liquidity altcoins face unique risk: the exchange can pause trading, widen spreads, or raise margin requirements mid-trade, leaving you unable to exit. Size accordingly, prefer perps on deeply-liquid names, and watch funding as closely as price.