Perpetual Futures, Explained Without the Jargon
A perpetual future — “perp” for short — is a leveraged bet on a token’s price that never expires. They make up most of the daily volume in crypto, and they’re also where most retail traders get hurt. Here’s what you actually need to know before placing one.
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How perps work in one paragraph
You post some collateral (USDC, usually). The exchange lets you control a much larger position — say 10x what you put down. If the price moves your way, you make 10x the move. If it moves against you, you lose 10x. When losses get close to your collateral, you get liquidated — the position is force-closed and your collateral is gone.
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The four numbers that matter
1. Leverage
How much position size you control per dollar of collateral. 10x leverage on $1,000 = a $10,000 position. Higher leverage = bigger gains and bigger liquidation risk.
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2. Liquidation price
The price at which your position is auto-closed. Always know it before you open the trade. At 10x leverage, a 10% move against you wipes you out (minus a maintenance margin buffer).
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3. Funding rate
A payment between longs and shorts, every few hours. When more people are long, longs pay shorts (and vice versa). It nudges the perp price back toward the spot price. If funding is +0.05% / 8h and you’re long, you pay that on your position size, not your collateral. Hold for days at high funding and you bleed out.
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4. Maintenance margin
The minimum collateral ratio you must keep. Drop below it and you’re liquidated. Adding more collateral mid-trade pushes your liquidation price further away.
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Cross vs. isolated margin
- Isolated — only the collateral assigned to that position can be liquidated. One bad trade can’t wipe your whole account.
- Cross — your whole balance backs every position. More capital efficient, but one bad trade can take everything.
New traders should default to isolated.
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Common ways perps trade hurt people
- Too much leverage. 25x feels exciting until a 4% wick takes you out.
- Ignoring funding. Holding a popular long through high funding eats your edge.
- No stop loss. Without a hard exit plan, hopium becomes a liquidation.
- Adding to losers. Doubling down on a losing position just brings your liquidation price closer.
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How to start safely
- Use 2x–3x leverage until the mechanics feel automatic
- Always set a stop loss at trade entry
- Trade a size you’d be okay losing entirely — because you might
- Check funding before holding overnight
- Use isolated margin so one mistake doesn’t end your account
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The takeaway
Perps are a precise tool — and like any precise tool, they reward respect and punish casualness. The math is simple, the discipline is hard. Master the four numbers above and you’re already ahead of most traders.
