⚠️ Educational content only. Trading involves substantial risk of loss and is not suitable for everyone. Read our Risk Disclaimer.

Personal Trading Coach

What Are Perpetual Swaps? Funding Rates Explained

The Big Idea

Perpetual swaps (often shortened to “perpetuals” or “perps”) are a type of cryptocurrency futures contract with no expiration date. Unlike traditional futures that expire on specific dates and require settlement, perpetual swaps can be held indefinitely. This sounds simple but creates a problem: how do you keep a never-expiring contract’s price aligned with the actual spot market? The answer is the funding rate — periodic payments between long and short position holders that incentivize the contract price to track the spot price. When the perpetual trades above spot, longs pay shorts (encouraging traders to short, pushing the price back down). When it trades below spot, shorts pay longs (encouraging buying). Funding rates are typically calculated and paid every 8 hours. They can be a small cost or a significant erosion of profits depending on market conditions. Perpetual swaps now dominate crypto derivatives trading, with daily volumes often exceeding spot trading on major coins.

Think of perpetual swaps like a perpetual lease on a car. With a normal car lease, you sign for a specific term — 24 months, 36 months — and at the end, the lease expires and you return the car. Traditional futures work like this — they expire on specific dates. A perpetual lease wouldn’t work in normal cars because the dealer needs to plan inventory. But what if instead of expiration, you paid (or received) small adjustments every month based on the car’s current market value relative to your lease price? If your lease price was below market, you’d pay a bit extra; if above market, you’d get a credit. The adjustments would keep the lease economically aligned with the market without forcing a definite end date. That’s essentially what funding rates do for perpetual swaps.

For beginners trading crypto, perpetual swaps are unavoidable to understand because they dominate crypto derivative trading. The leverage available, the 24/7 trading, and the lack of expiration all make them attractive but also dangerous. Funding rates can erode positions held for extended periods. High leverage (combined with crypto volatility and funding costs) creates routine liquidations. Understanding perpetuals helps you decide whether to trade them at all, and if so, how to manage the specific risks they create. For most retail traders, perpetuals should be approached with extreme caution or avoided entirely until substantial spot trading experience exists.

How Perpetual Swaps Work

The Basic Mechanics

Perpetual swaps trade like futures but with no expiration:

Mark Price vs Last Price

Perpetuals use two different prices:

Liquidations are calculated based on Mark Price, not Last Price. This prevents manipulation where someone could push the perpetual price briefly to liquidate other traders.

The Index Price

The index price is typically a weighted average of spot prices across major exchanges (Binance, Coinbase, etc.). This gives the “fair” price that the perpetual should approximately match.

The Premium

The difference between perpetual price and index price is the “premium.” Positive premium (perpetual above spot) suggests bullish sentiment; negative premium (perpetual below spot) suggests bearish sentiment.

The Funding Mechanism

Funding payments occur (typically every 8 hours) to bring the perpetual price back toward the index price.

How Funding Rates Work

The Calculation

Funding rates have two components:

The combined rate determines who pays whom and how much.

Funding Direction

Positive funding rate — Longs pay shorts. Happens when perpetual trades above spot (bullish market sentiment).

Negative funding rate — Shorts pay longs. Happens when perpetual trades below spot (bearish market sentiment).

Funding Frequency

Most exchanges calculate and pay funding every 8 hours:

Typical Funding Rates

Funding rates are typically small but can vary widely:

Calculation Example

Position: $10,000 long Bitcoin perpetual
Funding rate: 0.01% per 8 hours
Funding payment: $10,000 × 0.0001 = $1 per 8 hours
Daily cost: $3
Monthly cost: $90 (0.9% of position)

For larger positions or higher rates, costs escalate proportionally.

The Compounding Reality

For high-leverage positions, funding can dominate returns:

Long-term holding of leveraged perpetual positions during bullish funding can be very expensive.

Why Perpetuals Dominated Crypto Derivatives

No Expiration Convenience

Traders don’t have to worry about rolling over expiring contracts. Open a position, hold it as long as desired (subject to funding and liquidation).

24/7 Trading

Crypto markets never close. Perpetuals fit this — you can trade and close positions anytime.

High Leverage Available

Crypto perpetuals offer leverage levels not available in traditional futures (often 100x+). This appeals to speculative traders.

Capital Efficiency

Small margin controls large positions. Capital can be deployed more flexibly than spot trading.

Easy Shorting

Going short is as simple as going long. No share borrowing required (as in stock shorting).

Liquidity

Major perpetual markets (Bitcoin, Ethereum) have deep liquidity. Tight spreads, ability to trade large size.

Stablecoin Settlement

Most perpetuals settle in stablecoins (USDT, USDC). This avoids the complexity of having to actually deliver Bitcoin or other crypto.

The Funding Rate as Sentiment Indicator

Funding rates provide insight into market positioning and sentiment.

High Positive Funding

When funding is consistently high positive, it indicates:

Negative Funding

When funding goes negative:

Trading the Funding Rate

Some sophisticated traders specifically trade based on funding patterns:

The Carry Trade

One sophisticated strategy: long spot Bitcoin + short Bitcoin perpetual. This eliminates directional risk while capturing funding payments when funding is positive. Annualized yields of 15-30% have been possible during bullish periods.

Risks:

Perpetuals vs Traditional Futures

Feature Perpetual Swaps Traditional Futures
Expiration None Specific date
Funding Yes (every 8 hours typically) No (price reflects time-to-expiry)
Roll required No Yes (every expiration cycle)
Long-term cost Funding rate × time Roll spread × number of rolls
Trading hours 24/7 Market hours (varies by contract)
Settlement Cash, ongoing Cash or delivery, at expiration
Where common Crypto Traditional commodities, indexes

The Major Perpetual Markets

Centralized Exchanges

Decentralized Perpetuals

Volume Comparison

Perpetual volumes typically exceed spot volumes for major cryptocurrencies. Bitcoin perpetual daily volume often exceeds $50B globally. This makes perpetuals the largest crypto trading market by volume.

Examples of Perpetual Trading

Example 1 — Sarah’s Funding Cost Lesson

Sarah opens a $10,000 long Bitcoin perpetual position with 5x leverage ($2,000 margin).

The market is bullish, funding rate is 0.05% per 8 hours.

She holds the position for 30 days. The position size remains roughly $10,000 (price doesn’t change much).

Daily funding cost: $10,000 × 0.0005 × 3 = $15

30-day funding cost: $450

That’s 22.5% of her $2,000 margin gone to funding alone, even though the price didn’t move significantly.

Her lesson: high funding rates make extended position holding very expensive. Perpetuals are best for shorter-term positions in bullish markets where funding is high.

Example 2 — Jake’s Liquidation

Jake goes long Bitcoin with $1,000 margin at 50x leverage. Position size: $50,000.

Bitcoin moves down 1.8% within an hour. Loss: 1.8% × $50,000 = $900.

His liquidation price triggers (around 1.5-1.8% adverse move at 50x). Position closed automatically. Remaining margin: maybe $50-100 (some safety buffer).

Bitcoin then rebounds 3% over the next few hours. Jake’s “thesis” was correct — but he was liquidated long before the price recovered.

This is the central problem with high-leverage perpetuals. Even correct directional bets get liquidated by routine volatility before they play out. The leverage that “amplifies gains” actually amplifies the noise of price movements.

Example 3 — Maya’s Funding Arbitrage

Maya implements a delta-neutral funding strategy:

Net Bitcoin exposure: zero. She’s not betting on direction.

Funding rate: 0.04% per 8 hours (positive, so shorts receive payment).

Daily funding income: $50,000 × 0.0004 × 3 = $60
Monthly income: $1,800
Annualized: ~$21,600 on $55,000 deployed (~40% annualized)

Caveats:

This is a real strategy used by sophisticated traders. The high funding rates during crypto bull markets create genuine yield opportunities for those with the capital and operational expertise to capture them.

Risks Specific to Perpetuals

Funding Rate Risk

Holding perpetuals long-term during persistent positive (or negative) funding can erode returns substantially. What looks like a small percentage adds up over weeks or months.

Liquidation Risk

High leverage combined with crypto volatility creates routine liquidations. Even small adverse moves can wipe out positions.

Cascade Risk

When markets move sharply, leveraged liquidations cascade. Each liquidation pushes price further, triggering more liquidations. These cascades can produce extreme moves in minutes.

Insurance Fund Coverage

Major exchanges maintain insurance funds to cover situations where liquidations don’t fully cover position losses. These funds can be depleted in extreme events, leading to “auto-deleveraging” (ADL) where profitable positions get partially closed to cover losses.

Mark Price Manipulation

Although less common with mark price systems, exchanges can sometimes have temporary mark price issues that affect liquidation calculations.

Exchange Risk

Perpetuals are typically traded on centralized exchanges. Exchange failures (FTX) affect perpetual traders directly. Funds on exchange face counterparty risk.

Regulatory Risk

Perpetual swaps face increasing regulatory scrutiny in various jurisdictions. The CFTC has taken action against some platforms offering them to US customers. Future restrictions could affect availability.

Common Mistakes

  1. Not understanding funding costs. Long-term leveraged positions have significant funding drag.
  2. Treating perpetuals like spot. Different mechanics, different risks.
  3. Maximum leverage usage. 100x leverage is essentially gambling, not trading.
  4. Ignoring funding for sentiment. Funding rates contain information about market positioning.
  5. Holding through funding to “save fees.” Compounding funding costs can exceed transaction fees.
  6. Not setting stop losses. Liquidation as stop loss = terrible exit prices.
  7. Cross margin without understanding. Can wipe out entire account.
  8. Trading during high volatility with leverage. Mathematics of leverage + volatility = liquidations.
  9. Confusing perpetual price with spot price. They differ, especially during volatile markets.
  10. Ignoring exchange risk. Perpetuals on failed exchange = lost funds.

The Big Picture

Perpetual swaps are crypto’s dominant derivatives instrument with specific mechanics.

Here’s what to remember:

For most retail crypto traders, perpetual swaps should be approached with extreme caution or avoided entirely. The combination of crypto’s inherent volatility, high available leverage, and ongoing funding costs creates an environment where most participants lose money. The exchange-friendly structure (high leverage marketing, accessible interfaces) doesn’t reflect what’s actually good for traders.

If you do trade perpetuals, several practices help:

Use modest leverage. 2-5x maximum for most situations. The mathematics of high leverage + crypto volatility virtually guarantees losses for inexperienced traders.

Watch funding rates. Both as costs to manage and as sentiment indicators. Extremely high funding suggests over-leveraged markets prone to corrections.

Set explicit stop losses. Don’t rely on liquidation. Set stops at levels you’ve consciously chosen, not at the maximum loss your account can absorb.

Use isolated margin. Limits losses to specific positions. Cross margin is for sophisticated traders only.

Account for funding in expected returns. A 5% gain in spot Bitcoin might be a 3% gain in 5x leveraged perpetual after funding costs. Run the actual numbers.

Don’t hold long-term. Perpetuals are short-term tactical instruments. Long-term Bitcoin exposure is better held as spot. The funding costs of long-term leveraged perpetual holding usually exceed the capital efficiency benefits.

Consider exchange risk. Perpetual positions on a single exchange concentrate risk. Diversifying across exchanges (and not maintaining excessive balances on any one) reduces exposure to exchange failures.

Some sophisticated uses of perpetuals are legitimate:

These uses require understanding the mechanics. They don’t suit casual traders.

The crypto industry’s heavy focus on perpetuals reflects exchange business models more than retail trader interests. Exchanges profit from trading volume, liquidations, and funding rate spreads. The high-leverage marketing exists because it serves exchange profitability, not because it’s good advice for retail traders.

For the typical retail crypto user, the practical approach is:

This conservative approach won’t generate the dramatic returns that high-leverage marketing promises. But it also won’t create the dramatic losses that high-leverage trading actually delivers. Most successful crypto traders are not using maximum leverage on perpetuals — they’re managing risk carefully across spot and limited derivatives use.

Perpetuals are a real tool with real uses. They’re also a real source of routine retail losses when used inappropriately. Choose your usage based on what’s actually best for your situation, not what exchange marketing suggests.

Related Terms

← Back to the Complete Trading Terms Glossary

Focus on the process. Trust the stats. Stay consistent.