Bitaigen Research In the digital‑asset derivatives market, perpetual contracts are popular among many traders because they have no fixed settlement date, unlimited position holding periods, and typically a small basis. These features allow the contract price to stay closely aligned with the underlying index. The core of these advantages lies in the contract’s unique funding rate mechanism, which is essential knowledge for investors participating in perpetual contracts.
In this article we systematically outline the concept and operation of perpetual‑contract funding rates, helping traders interpret the signals behind fee flows. By dissecting the platform’s settlement mechanism and its influencing factors, you can more accurately assess the cost of holding a position and therefore devise more rational strategy plans. If you want to dive into the details, keep reading.
Meaning of the Funding Rate for Perpetual Contracts
The funding rate is the key adjustment tool that keeps perpetual contract prices close to spot prices. It periodically transfers fees between long and short positions, enabling the contract price to stay synchronized with movements of the underlying asset. The rule set works as follows:
- If the transaction price of a perpetual contract is higher than the spot price of the underlying asset, the funding rate is positive, meaning longs must pay a fee to shorts.
- If the transaction price of a perpetual contract is lower than the spot price of the underlying asset, the funding rate is negative, meaning shorts must pay a fee to longs.
In short, the funding rate is a periodic settlement fee charged to the side holding the position (long or short) based on the gap between the perpetual contract price and the spot index price. When the market is bullish, longs pay; when the market is bearish, shorts pay.
How the Funding Rate Is Calculated
On the CoinEx platform, funding rates are settled three times a day at 08:00, 16:00, and 24:00 (Hong Kong Time). Only users who still hold open positions at those timestamps will incur a fee or receive a payment; positions closed before the settlement moment generate no charge.
Each settlement uses a rate derived from market data taken one minute before the previous settlement. The calculation formula is:
Funding Rate = Clamp( MA( ((Depth‑Weighted Bid + Depth‑Weighted Ask) / 2 – Spot Index Price) / Spot Index Price – Interest ), a, b )
Key components explained:
- MA: Moving average. CoinEx averages the depth‑weighted bid/ask prices and the spot index price over a defined time window.
- Interest: Currently fixed at 0.
- a, b: Upper and lower bounds for the rate. For all listed perpetual contracts (BTCUSD, BCHUSD, ETHUSD, LTCUSD, BSVUSD, XRPUSD, EOSUSD) the bounds are set to a = –0.1% and b = +0.1%.
- Depth‑Weighted Bid: The weighted average price of the “margin‑impact amount” on the buy side.
- Depth‑Weighted Ask: The weighted average price of the “margin‑impact amount” on the sell side.
- Margin‑Impact Amount: The total value of orders at a certain depth of the order book.
Practical Guidance for Trading Perpetual Contracts
Before entering a perpetual‑contract trade, investors should first assess the market trend. Common technical perspectives include daily, weekly, and even monthly charts, combined with an analysis of the long‑term fundamentals of major cryptocurrencies. This combined approach helps determine whether the price is likely to move upward or downward over the upcoming period. Blindly chasing rallies or panic‑selling on dips often leads to unnecessary losses; once a clear trend is identified, formulating entry and exit plans can significantly improve the probability of a successful trade.
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The sections above explain the concept of perpetual‑contract funding rates, how they are calculated, and the practical considerations when using them. For deeper analysis of perpetual contracts, stay tuned to Bitaigen’s (比特根) upcoming专题文章 series.
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