Perpetual Futures Contracts
Understand perpetual futures contracts, economic exposure, margin, funding, liquidation and why perpetuals differ from spot and dated futures.
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A perpetual futures contract is a derivative that tracks the price of a cryptoasset without a fixed expiry date. It lets traders take long or short economic exposure without exchanging the underlying asset on every trade, but the position introduces margin, funding, liquidation and venue-counterparty risk.
Core concept
Perpetual futures are synthetic contracts whose value changes with an underlying reference asset such as BTC or ETH. A long gains when the contract price rises and loses when it falls; a short has the opposite exposure.
Unlike spot ownership, a perpetual position normally represents a contractual claim against the derivatives venue or clearing system. The trader may post stablecoin, fiat-linked collateral or crypto collateral depending on product design.
Unlike dated futures, the contract has no scheduled maturity. Instead, venues use funding payments and mark/index price mechanisms to keep the perpetual price reasonably anchored to the underlying market.
How the mechanics fit together
Notional exposure
Position size multiplied by contract price. This is the market exposure that drives P&L.
Initial margin
Collateral required to open or maintain the chosen notional under venue rules.
Maintenance margin
Minimum equity threshold before liquidation or other risk controls can begin.
Funding
Periodic transfers between longs and shorts, usually linked to the difference between perpetual and reference prices.
Mark price
A venue-defined fair-price reference often used for unrealised P&L and liquidation logic rather than the last traded price.
Settlement asset
The currency or token in which collateral and realised P&L are accounted.
Comparison framework
| Instrument | Economic form | Carry/anchor | Distinctive risk |
|---|---|---|---|
| Spot | Own/hold underlying asset | No funding | No derivative liquidation from leverage if unlevered |
| Perpetual futures | Synthetic long/short exposure | Periodic funding | Margin and liquidation risk |
| Dated futures | Synthetic exposure to fixed maturity | Basis converges into expiry | Expiry/roll mechanics |
Worked example
BTC spot is £80,000. A trader opens a perpetual long with £8,000 notional exposure and posts £4,000 collateral. A 5% fall in the contract price creates roughly a £400 mark-to-market loss before fees and funding: 10% of the posted collateral, even though BTC moved only 5%. If the trader had used £40,000 notional against the same £4,000 collateral, the same 5% move would imply about £2,000 loss before liquidation rules—half the collateral. The lesson is that leverage changes the relationship between market movement and account equity; it does not improve the underlying forecast.
Risk map
Liquidation
Venue closes or reduces a position when margin falls below required thresholds.
Funding drag
A profitable directional view can still underperform if funding payments are persistently adverse.
Counterparty/venue
The derivative depends on exchange solvency, custody, matching and risk systems.
Collateral correlation
Crypto collateral can fall at the same time as a long position, worsening account equity.
Common mistakes and misunderstandings
- Thinking a perpetual is the same as owning the coin.
- Judging risk from collateral posted instead of full notional exposure.
- Ignoring funding because it is small for one interval.
- Assuming liquidation price is fixed even when fees, funding, collateral or maintenance tiers change.
- Using leverage to compensate for weak conviction or poor entry quality.
Practical analysis workflow
- Identify the contract multiplier, settlement asset and collateral type.
- Convert position size into money notional.
- Read mark-price, funding and maintenance-margin rules.
- Stress-test P&L under plausible adverse moves before opening.
- Treat venue exposure and liquidation path as separate risks from the market thesis.
Knowledge checkpoint
These questions are specific to Perpetual Futures Contracts.
Q1. Why does a £40,000 notional position create more account-equity risk than an £8,000 notional position when both use £4,000 collateral?
Q2. What keeps a perpetual contract from drifting indefinitely away from spot if there is no expiry?
Q3. Why can crypto collateral create wrong-way risk for a long crypto perpetual?
Q4. Which venue rules would you verify before calculating a liquidation level?
FAQ
❓ Do perpetual futures expire?
No fixed expiry is typical, but the venue can still close positions through liquidation, delisting or other contractual rules.
❓ Do I own the underlying crypto?
Normally no. You hold derivative exposure rather than direct ownership of the referenced asset.
❓ Is leverage required?
No. A trader can choose low effective leverage by keeping collateral large relative to notional, subject to venue rules.
❓ Can a profitable trade lose money after costs?
Yes. Fees and funding can materially reduce or even reverse net P&L.
Summary
- Perpetuals provide non-expiring synthetic long/short exposure.
- Notional, not merely posted collateral, determines directional P&L sensitivity.
- Funding, mark price and maintenance margin are core contract mechanics.
- Leverage magnifies the effect of market movement on account equity and can trigger forced liquidation.
This building block is educational. It explains market structure and risk; it is not a recommendation to use derivatives or leverage.
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