Perpetual futures

Definition

Perpetual futures (“perps”) are crypto-native futures with NO expiry: instead of converging to spot at settlement (instrument-futures-contract), they tether to spot through a FUNDING RATE — a periodic payment between longs and shorts, signed by the contract’s premium or discount to a spot index. Trading above index, longs pay shorts (pressure down); below, shorts pay longs. Perps dominate crypto derivatives volume globally — concentrated on offshore venues outside US retail access — and their funding rate doubles as the market’s real-time price of leveraged directional demand (crypto-basis-carry).

How it works / structure

• Funding mechanism: at fixed intervals (commonly every 8 hours; venue-defined), position holders exchange funding = position notional × funding rate, where the rate derives from the average premium of the perp’s mark price over the spot index plus an interest-rate term. Funding is peer-to-peer — the venue transfers it between sides.
• Mark price and liquidation: positions margin against a MARK price (index-anchored, smoothing formula venue-defined) rather than last trade, to resist thin-print manipulation (crypto-venue-order-types). Breaching maintenance margin triggers venue-side forced liquidation — the venue’s engine closes the position into the book, with an insurance fund (and, historically on some venues, position clawbacks or auto-deleveraging) absorbing shortfalls.
• Collateral: stablecoin-margined (linear) or coin-margined (inverse — P&L in the volatile asset itself, convexity effects included) (crypto-stablecoins).
• Leverage: venues have offered high double-digit to triple-digit maximum leverage — the CFTC advisory’s warning case; effective leverage interacts with the liquidation engine to produce cascade dynamics.
• Price discovery: peer-reviewed evidence (Alexander et al. 2020) found the leading perp venue led spot in price discovery during its sample — the derivative is not a follower market.

When it applies

Understanding crypto market dynamics even WITHOUT trading perps: funding rates are a positioning gauge cited in sentiment work (sent-cot-reports is the regulated-market analog), liquidation cascades explain a documented class of violent intraday moves, and the perp basis is one leg of carry analysis (crypto-basis-carry). US-regulated books express equivalent exposure through CME futures (crypto-cme-futures) — this entry is market-structure knowledge, not an access claim.

Risk profile & failure modes

• Liquidation cascades: forced closes push price into further liquidations — documented amplification in fast moves; realized crypto crash paths are partly liquidation mechanics, not only information.
• Funding bleed: holding the crowded side pays funding continuously; extended one-sided regimes have annualized to double-digit costs (Schmeling et al. 2023 document the carry magnitudes) — a position thesis must price its funding path.
• Venue-rule discretion: mark-price formulas, funding parameters, insurance-fund behavior, and auto-deleveraging are venue policy — terms can change and have; counterparty risk is the venue itself (crypto-custody-models).
• Basis snap: perp premiums compress violently in stress — a carry position’s “yield” and its drawdown arrive from the same mechanism (crypto-basis-carry).

Evidence & limits

Funding mechanics are venue-documented and uniform in shape across major venues; price-discovery and carry evidence is peer-reviewed/BIS-published as cited. Funding levels, leverage caps, and engine parameters are venue- and time-specific — dated facts requiring current values at thesis time. US access restrictions make perp data an ANALYTICAL input for the platform, not a tradable surface.

Falsifiable-thesis examples

Illustrations only, not signals:

• “Aggregate bitcoin perp funding stays positive (longs paying) for over 80% of intervals this quarter (leveraged-demand regime thesis)” — falsified by the funding series.
• “The next 10%+ hourly bitcoin decline coincides with liquidations exceeding the trailing 90-day hourly maximum (cascade-mechanics thesis)” — falsified by paired price/liquidation data.

Cross-references

• Dated-futures baseline: instrument-futures-contract, ms-futures-margin; the regulated alternative: crypto-cme-futures
• The carry it defines: crypto-basis-carry, strategy-futures-carry
• The plumbing: crypto-stablecoins (collateral), crypto-venue-order-types (mark price, reduce-only), crypto-spot-market-structure (index construction)