Perpetual Contract Trading Fees and Funding Fees Announcement

Dear Users,

To help you understand the fees involved in perpetual contract trading, the following explains SUNX perpetual contract trading fees, funding fees, and their calculation methods.

I. Types of Fees

Trading fees and funding fees are two separate types of fees in perpetual contract trading:

• Trading fees: Calculated based on the actual executed transaction value and the applicable fee rate when an opening or closing order is filled.
• Funding fees: Calculated for positions that meet the applicable funding settlement conditions at the scheduled settlement time. Users may pay or receive funding fees.

II. Opening and Closing Trading Fees

1. Opening Fees

When an order to open a new perpetual contract position is filled, the opening fee is calculated based on the actual executed transaction value and the applicable fee rate.

2. Closing Fees

When an order to close an existing perpetual contract position is filled, the closing fee is calculated based on the actual executed transaction value and the applicable fee rate.

Opening and closing fees are calculated separately. If an order is filled through multiple executions, the fee for each execution is calculated based on its actual transaction value and applicable fee rate.

III. Maker and Taker

1. Maker

An order is classified as Maker when it does not immediately match existing orders in the order book upon submission and instead enters the order book to await execution, providing liquidity to the market.

When that portion of the order is subsequently filled, the applicable Maker fee rate is used to calculate the trading fee.

2. Taker

An order is classified as Taker when it immediately matches existing orders in the order book upon submission, consuming existing market liquidity.

The applicable Taker fee rate is used to calculate the trading fee for that execution.

3. Classification Criteria

Maker and Taker classifications depend on how an order is actually executed, rather than solely on the order type selected by the user.

A limit order is not necessarily a Maker order. If a limit opening or closing order immediately matches existing orders, that portion of the execution may still be classified as Taker. A single order may also include both types of executions. Please refer to the execution records for the actual classification.

IV. SUNX Perpetual Contract Trading Fee Rates

For the fee category and actual fee rate applicable to a specific trading pair, please refer to the relevant SUNX contract trading page and fee rules.

V. Trading Fee Calculation

Trading fees are calculated based on the actual executed transaction value, rather than directly on the margin deposited by the user.

Trading Fee = Margin × Leverage × Fee Rate

Calculation Example

The following is a calculation example only:

Assume the executed transaction value of an opening trade is 100 USDT and the leverage is 200×:

Opening Fee = 100 × 200 × 0.04% = 8 USDT

If the executed transaction value of the closing trade is also 100 USDT, the closing fee is 8 USDT, and the total opening and closing fees are 16 USDT.

VI. What Are Funding Fees?

Funding fees are a common price adjustment mechanism used in perpetual contracts to help keep contract prices close to the underlying spot prices. Funding fees are generally settled between holders of long and short positions and are separate from opening and closing trading fees.

Under the commonly used two-way funding settlement mechanism:

• Positive funding rate: Long position holders pay funding fees to short position holders.
• Negative funding rate: Short position holders pay funding fees to long position holders.

VII. Funding Fee Calculation

Under the funding mechanism described above, funding fees are generally calculated based on the position value at settlement:

Funding Fee = Contract Quantity × Mark Price × Funding Rate

Your position value is independent of leverage. For example, if you hold 100 BTC perpetual contracts, funding fees are paid or received based on the notional value of those contracts, rather than on the amount of margin allocated to the position.

Funding Rate Calculation

Funding Rate (F) = Premium Index (P) + clamp (Interest Rate (I) − Premium Index (P), 0.05%, −0.05%)

Where:

Premium Index (P) = (Max (0, Impact Bid Price − Mark Price) − Max (0, Mark Price − Impact Ask Price)) / Spot Price + Fair Basis of the Mark Price

Interest Rate (I) = (Quote Interest Rate Index − Base Interest Rate Index) / Funding Rate Interval

Funding Rate Limits

SUNX caps funding rates to ensure that the highest leverage can be used.

The absolute funding rate cap is 0.15%.

IX. Important Reminders

1. Opening and closing executions are subject to trading fees under the applicable rules. Funding fees are calculated separately according to the specified settlement conditions.
2. Maker/Taker classifications depend on the actual matching method. A limit order does not necessarily qualify for the Maker fee rate.
3. Trading fees and funding fees generally depend on the executed transaction value or position value, rather than solely on the margin amount.
4. Holding a position across multiple funding settlement times may result in multiple funding payments or receipts.
5. Funding fee deductions may affect your available balance and margin level. Please monitor account risk indicators and maintain sufficient funds.
6. Please consider trading fees, funding fees, and slippage when evaluating your overall trading costs.

Thank you for your support and trust in SUNX.

SUNX Global Operations Team