Perpetual futures are a popular type of derivative contract in the cryptocurrency market, allowing traders to speculate on the future price of an asset without an expiration date. These contracts are designed to closely track the underlying spot price through a funding rate mechanism, making them a flexible tool for both hedging and speculative strategies. This guide explains the core mechanics, key features, and practical considerations for trading perpetual futures.
What Are Perpetual Futures?
Perpetual futures, or perpetual swaps, are derivative contracts that enable traders to go long or short on an asset with leverage. Unlike traditional futures, they do not have a set expiry date, meaning positions can be held indefinitely as long as maintenance margin requirements are met. Their price is designed to converge with the spot market through periodic funding payments between long and short traders.
There are two primary types of perpetual futures contracts, differentiated by their settlement currency:
- Crypto-margined contracts: Settled in cryptocurrencies like BTC.
- USDT-margined contracts: Settled in the USDT stablecoin.
Crypto-Margined Perpetual Futures
Crypto-margined perpetual futures are settled in the base cryptocurrency. For instance, a BTCUSD contract is settled in Bitcoin. This allows traders to gain direct exposure to the crypto asset, which can be useful for hedging existing spot holdings.
Example: BTCUSD Perpetual Futures Specifications
| Feature | Specification |
|---|---|
| Symbol | BTCUSD-PERP |
| Underlying | BTC/USD Index |
| Settlement Currency | BTC |
| Contract Size | 100 USD |
| Price | USDT price of 1 BTC |
| Tick Size | 0.1 |
| Leverage | 0.01-100x |
| Trading Hours | 24/7 |
| Funding Times | 12:00 am, 8:00 am, 4:00 pm UTC |
USDT-Margined Perpetual Futures
USDT-margined perpetual futures are settled in USDT. This means traders can speculate on various cryptocurrencies without needing to hold the underlying asset, simplifying the trading process and risk management by using a single stablecoin for all margin and profit/loss calculations.
Example: BTCUSDT Perpetual Futures Specifications
| Feature | Specification |
|---|---|
| Symbol | BTCUSDT-PERP |
| Underlying | BTC/USDT Index |
| Settlement Currency | USDT |
| Contract Size | 0.01 BTC |
| Price | USDT price of 1 BTC |
| Tick Size | 0.1 |
| Leverage | 0.01-100x |
| Trading Hours | 24/7 |
| Funding Times | 12:00 am, 8:00 am, 4:00 pm UTC |
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Key Features of Perpetual Futures
Understanding the unique mechanisms of perpetual futures is essential for effective trading and risk management.
Settlement Currency
The choice between crypto-margined and USDT-margined contracts depends on your strategy. Crypto settlement provides direct exposure to the asset, while USDT settlement offers simplicity and stability by using a stablecoin for all calculations.
No Expiration Date
A defining feature is the lack of an expiry date. Traders can maintain their positions as long as they wish, avoiding the need to roll over contracts as with traditional futures.
Index Price
The contract price is derived from an index price to prevent market manipulation.
- USDT-margined futures use a USDT index.
- Crypto-margined futures use a USD index.
This index is calculated from the spot prices on multiple major exchanges, with mechanisms in place to filter out anomalous price data.
Price Range Adjustment
To protect the market from extreme volatility and malicious activities, exchanges dynamically adjust the allowable price range for new orders based on recent spot market activity and previous minute's prices.
Mark Price
Instead of the last traded price, the mark price—a calculated fair value based on the index price—is used to determine unrealized profit and loss and to trigger liquidations. This prevents large, abnormal trades from causing unnecessary liquidations.
Tiered Maintenance Margin
Exchanges use a tiered margin system where larger positions require a higher maintenance margin ratio. This effectively lowers the maximum allowable leverage for bigger positions, promoting market stability and protecting traders from excessive risk.
Funding Rate Mechanism
The funding rate is the core mechanism that ties the perpetual contract price to the spot price. It is a periodic fee paid between long and short traders.
- If the rate is positive, long positions pay short positions.
- If the rate is negative, short positions pay long positions.
Funding typically occurs every eight hours. Traders can avoid paying fees by closing their positions before the funding time.
Trading Modes: One-Way vs. Hedge
Platforms often offer two distinct position modes:
- One-Way Mode: A trader can only hold a position in one direction (e.g., only long or only short) per instrument. Opening a position in the opposite direction will reduce the existing position.
- Hedge Mode: A trader can simultaneously hold both long and short positions for the same instrument. This allows for more complex strategies, such as hedging a long spot position with a short perpetual futures position.
Frequently Asked Questions
What is the main difference between crypto-margined and USDT-margined contracts?
The key difference is the settlement currency. Crypto-margined contracts are settled in the underlying cryptocurrency (e.g., BTC), while USDT-margined contracts are settled in USDT. This affects your exposure to the asset's price and how you manage your margin.
How does the funding rate work?
The funding rate is a fee exchanged between traders to ensure the perpetual futures price converges with the spot index price. It is paid periodically (e.g., every 8 hours). If you hold a position at the funding time, you will either pay or receive the fee depending on whether you are long or short and the rate's direction.
What is a mark price and why is it important?
The mark price is an estimated fair value of the contract based on the spot index price. It is used to calculate unrealized PnL and to determine liquidations instead of the last traded price. This prevents "liquidations by spoofing," where a large but abnormal trade could trigger stop-losses.
Can I avoid paying funding fees?
Yes. Since funding fees are only charged if you hold a position at the exact moment of funding settlement, you can close your position before the scheduled funding time to avoid the fee and then reopen it afterward.
What is the advantage of hedge mode?
Hedge mode allows you to hold both long and short positions in the same market simultaneously. This is useful for sophisticated strategies like market-neutral trading or for hedging an existing spot portfolio without having to close your long-term holdings.
How does leverage affect my risk?
While leverage can amplify profits, it also significantly amplifies losses. Using high leverage increases the risk of liquidation, where your position is automatically closed if the market moves against you and your margin balance falls below the maintenance requirement. 👉 Learn more about risk management tools