What Is a Perpetual Contract? Core Mechanisms Beginners Must Know

On the homepage of cryptocurrency exchanges, you often see the option "Perpetual Contracts." Data shows that the trading volume of perpetual contracts has long accounted for over 60% of the total cryptocurrency market volume, far exceeding spot trading. However, the reality is that over 90% of novice traders lose money on perpetual contracts.

Perpetual contracts are attractive because they have three main features:

• 1. Leverage: Control a large position with a small amount of capital.
• 2. No Expiry Date: Hold positions indefinitely.
• 3. 24/7 Trading: Trade non-stop, 7 days a week.

These very features also make perpetual contracts the product where novices lose money most easily. The core reason most novices lose money is not misjudging the direction, but not understanding the core mechanism of perpetual contracts.

Perpetual contracts are suitable for traders with some experience who can strictly follow discipline, and for spot holders who need to hedge risks. They must also understand the importance of risk management. They are not suitable for novices who have never been exposed to cryptocurrency, as newcomers to the crypto space are prone to emotional fluctuations, cannot withstand losses, and may even dream of getting rich overnight, using leverage as a "quick wealth tool."

1. The Essence of Perpetual Contracts: A "Leveraged Price Prediction Game"

A perpetual contract is a cryptocurrency derivative with no expiry date, that uses leverage, and maintains a peg to the spot price through a funding rate.

In spot trading, you actually buy and hold Bitcoin. In a perpetual contract, you are simply betting on the direction of Bitcoin's price movement.

The profit and loss for a perpetual contract has a simple calculation formula as follows:

Profit/Loss = (Closing Price - Opening Price) × Contract Quantity

For example:

Bitcoin current price: $50,000

You predict an increase and open a long position with 10x leverage

Margin: $5,000 (controlling a position worth $50,000)

Bitcoin rises to $55,000 (a 10% increase)

Your profit: $5,000 (100% return)

But conversely, if Bitcoin falls to $45,000 (a 10% decrease), you will lose your entire $5,000 margin.

Note that leverage only affects the principal invested and the risk, not the absolute profit or loss. Profit and loss themselves are unrelated to leverage; leverage only determines how much margin you need to open a corresponding position.

2. The Biggest Difference Between Perpetual Contracts and Traditional Futures: Why Are They "Never Settled"?

Traditional futures contracts have a fixed expiry date and must be settled in physical or cash form upon expiry. Perpetual contracts are called "perpetual" because they have no expiry date and can be held indefinitely.

The key mechanism that achieves "perpetuity" is the "funding rate." The funding rate is one of the most core mechanisms of perpetual contracts. Its function is:

• 1. To anchor the perpetual contract price to the spot price.
• 2. To exchange funds between long and short positions every 8 hours.

Direction of the funding rate:

• When perpetual price > spot price: Longs pay funding to shorts.
• When perpetual price < spot price: Shorts pay funding to longs.

This mechanism ensures that the perpetual contract price does not deviate too far from the spot price for a long period.

3. Core Mechanisms of Perpetual Contracts

1. Funding Rate

The funding rate is the cost most easily overlooked by novices. It settles every 8 hours (UTC time 0:00, 8:00, 16:00).

Funding Rate Cost Calculation Table:

Position Value	Funding Rate	Cost per 8 Hours	Daily Cost
$10,000	0.01%	$1	$3
$10,000	0.10%	$10	$30
$100,000	0.10%	$100	$300

In a bull market, the perpetual contract price is usually higher than the spot price, causing longs to continuously pay funding rates to shorts. Many novices correctly predict the direction but end up losing money because they ignore the funding rate.

The essence of the funding rate is to keep the perpetual price "close to the spot price," ensuring the contract market does not deviate from the real price over the long term.

2. Leverage and Margin

Types of Margin:

Initial Margin: The minimum margin required to open a position.

Maintenance Margin: The minimum requirement to keep the position from being liquidated.

Liquidation Price Calculation Formula (for Longs):

Liquidation Price ≈ Opening Price × (1 - 1/Leverage Multiple)

Note that this formula is a simplified version. The actual liquidation price will be affected by the maintenance margin rate, funding rate, contract type, etc., and will vary slightly between platforms.

For example:

Opening Price: $50,000

Leverage: 10x

Liquidation Price ≈ 50,000 × (1 - 1/10) = $45,000

This means a 10% price drop will trigger liquidation. The higher the leverage, the closer the liquidation price is to the opening price, leaving less room for error.

3. Liquidation Mechanism

When your margin balance falls below the maintenance margin requirement, liquidation is triggered. Liquidation does not mean your position goes to zero, but it usually results in the loss of most of the margin.

Why do exchanges almost never lose money?

Because when liquidation occurs, the exchange takes over your position and closes it at the market price. Even if there are remaining funds after closing, a liquidation fee is charged.

Exchanges use the mark price (the average price from multiple spot exchanges) to calculate liquidation, not the last traded price. This is to prevent large traders from manipulating the contract price to maliciously liquidate retail traders.

4. Mark Price vs. Last Price

• Last Price: The price of the last trade, which is more volatile.
• Mark Price: The average price calculated from multiple spot exchanges, which is more stable.

A common mistake novices make is only looking at the last price, thinking they are far from liquidation, when in reality, the mark price may already be close to the liquidation line.

5. Fee Mechanism

Fees for perpetual contracts are usually lower than for spot trading, but they have a significant impact on frequent traders.

Common Fee Rates:

Maker: 0.02%

Taker: 0.04%

If a trader trades 10 times a day, each time with $10,000, then:

Daily Fee: 10 × 10,000 × 0.04% = $40

Monthly Fee: 40 × 30 = $1,200

High-frequency traders often have their principal slowly "eaten away" by fees.

5. Two-Way Trading with Perpetual Contracts: Going Long and Going Short

Going Long

Suitable for bullish markets. Profit calculation is simple: percentage increase × leverage multiple.

However, going long has a hidden cost: in a bull market, the funding rate is usually positive, meaning longs need to pay fees to shorts. Holding a long position for a long time can see funding rates erode a significant portion of profits.

Going Short

Suitable for bearish markets. Profit calculation is similar: percentage decrease × leverage multiple.

Risks of Going Short:

1. Short Squeeze: When the price rises rapidly, shorts are forced to close their positions, further driving up the price.

2. Theoretically Unlimited Losses: Since there is no upper limit on price increases, the potential loss for shorts is theoretically unlimited.

Novice Misconception: Many people think going short is riskier than going long, but in reality, the risk mainly depends on position management and leverage usage.

6. The Most Critical Factor: Liquidity and Depth

Trading contracts with poor liquidity carries significant risks:

• 1. High Slippage: Your order will be executed at a worse price than expected.
• 2. Chain Reaction Liquidations: The liquidation of one large trader can trigger a series of liquidations.
• 3. Easy Manipulation: A small amount of capital can significantly influence the price.

Liquidity Risk Assessment Table:

Liquidity Level	Spread	Suggested Max Leverage	Risk Level
Excellent	<0.01%	20x	Low
Good	0.01%-0.05%	10x	Medium
Fair	0.05%-0.1%	5x	High
Poor	>0.1%	Not Recommended	Very High

Major coins like BTC and ETH have good liquidity, while contracts for small-cap altcoins usually have poor liquidity and carry extremely high risk. Even if you predict the direction correctly, you can lose money in low-liquidity contracts because slippage and chain-reaction liquidations can swallow all profits.

7. Risk Control Framework for Perpetual Contracts (Must-Read for Novices)

As a novice, you must understand some basic risk control principles. Pay attention to the following points:

1. The total position in perpetual contracts should not exceed 5% of your total capital, and a single trade should not exceed 1-2% of your total capital.

2. Novices are advised to start with 3-5x leverage and never exceed 10x leverage.

3. Always use limit orders to avoid slippage from market orders, and set a stop-loss order when opening a position.

Ask yourself four questions before trading:

• What is the maximum loss you can afford on this trade?
• At what price would my judgment be proven wrong?
• Why am I going long/short?
• Is the current volatility and liquidity suitable for trading?

Avoid periods of high funding rates:

Around the funding rate settlement times (UTC 0:00, 8:00, 16:00), the rate fluctuates more. Be cautious about opening positions, especially when the rate exceeds 0.05%.

8. Summary: Perpetual Contracts Are Not a Money-Making Tool, They Are a "Risk Amplifier"

Perpetual contracts will not make it easier for you to make money; instead, they will: amplify your mistakes and emotions, and shorten your decision-making time.

Traders who consistently profit from perpetual contracts in the long run are often not those who win the most, but those who lose the least. They strictly control risk, patiently wait for high-probability opportunities, and then execute their trading plan rigorously.

Final advice for novices:

Before investing real money, trade on a demo account for at least one month. Record every trade and analyze the reason for every loss. Only when you can consistently profit on the demo account for two consecutive weeks should you consider starting live trading with a very small amount of capital.

Frequently Asked Questions (FAQ)

Q1: What is the difference between perpetual contracts and leveraged tokens?

Perpetual contracts require active position management and can be liquidated to zero, but they have a funding rate mechanism. Leveraged tokens (e.g., 3x Long BTC) are passive products that do not get liquidated but suffer from volatility decay. They have management fees but no funding rate.

Q2: Can only experts trade perpetual contracts?

No, but you need at least 3-6 months of trading experience and the ability to strictly enforce risk management. It is recommended to start with low leverage (3-5x) and practice with small amounts of capital.

Q3: Why do I still lose money even when I predict the direction correctly?

Possible reasons: 1) Funding rates eroding profits; 2) Using too high leverage and getting liquidated on a small pullback; 3) Frequent trading leading to high fees; 4) Slippage costs exceeding expectations.

Q4: When is the funding rate highest?

Usually during extreme market sentiment: 1) Bull market frenzy (longs pay); 2) Panic sell-offs (shorts pay); 3) Around major events.

Q5: Can I hold a perpetual