Perp vs spot

A perp is the wrong tool when your horizon is long, funding runs against you, and you do not need leverage. Spot may fit better when you need ownership over months.

◇ THE MECHANIC

Spot gives you the asset. You pay spread and custody costs. No funding clock. No liquidation from leverage unless you borrow against it separately. Reduce-only orders on perps only shrink exposure; they cannot flip you net short by accident.

A perp gives you price sensitivity, meaning how much your P&L moves when the asset moves, with less upfront capital. You pay funding on a schedule, post margin, and live with a liquidation price. You trade capital efficiency for holding costs and forced exit risk.

Primary source: Kalshi's perpetual futures guide contrasts perps with spot and traditional futures under CFTC oversight.

◇ THE PURPOSE

Short-horizon traders want leverage without rolling futures. Long-horizon traders often underestimate how funding compounds. The product is not "better" than spot. It is different packaging of exposure.

◇ THE RISK

Bullish for six months but open a 10× perp because the slider allows it. A flat month costs funding (Lesson 03: $720 on $10k notional at +0.01%/h over 30 days). A −15% shakeout liquidates you before month six (Lesson 04: maintenance breach at roughly −9.5% on 10×). Spot would have let you hold through both if ownership was the goal.

◇ WORKED EXAMPLE

90-day hold · $10k exposure · illustrative costs

~$2,160 funding over 90 flat days

Assume BTC flat for 90 days. Funding averages +0.01%/h (long pays). Spot entry pays ~0.1% taker fee once.

	Perp (5×)	Spot
Upfront capital	~$2,000 margin	~$10,000 + fee
Funding (90d, 0.01%/h)	~$2,160 paid	$0
Liquidation risk	Yes: mark path	No (unlevered)
Custody	Venue holds collateral	You hold BTC

Perp all-in holding costs dominate when price does not move your way and funding runs against you. Spot wins on simplicity when horizon is long and funding is hostile.

Simple test: if price went sideways for 90 days, would funding eat your thesis? If yes, reconsider the container.

If sideways funding would eat your thesis, spot is probably the better container.

◇ RECAP

• What are you holding? A perp is rented price sensitivity. Spot is the asset.
• What do you pay while holding? Funding on perps vs custody and spread on spot. Model both for your horizon.
• What forces you out? Liquidation on perps (Lesson 04: automatic close at maintenance breach). Only your sale choice on spot.
• When is a perp wrong? Long horizon, hostile funding, and no need for leverage. If sideways funding would eat your thesis, spot may be the better container.