[Fee Rules] Dynamic Overnight Fee Mechanism for Quick Contracts

Dear Users,

To improve the holding-cost mechanism for Quick Contracts and better reflect market changes, liquidity risks, and funding costs, SUNX will implement dynamic adjustments to overnight fees. The rules are as follows.

1. Overnight Fee Collection

SUNX Quick Contracts use an overnight fee model in which the platform collects the fees:

Overnight fees cover the risks and funding costs associated with the platform’s provision of liquidity.

This is an overnight fee collected by the platform and differs from funding payments exchanged between users.

2. Dynamic Rate Calculation

SUNX will reference actual funding rates from Binance and other major platforms over the preceding 24 hours, apply an equivalent compounded calculation, and add a safety buffer to determine the applicable overnight fee rate.

Formula:

SUNX Overnight Fee Rate = ∏ (1 + Each Period’s Reference Funding Rate) − 1 + ε

Where:

• Each Period’s Reference Funding Rate: The reference platform funding rates included within the calculation window;
• ∏: Multiplication of the corresponding values across all included periods;
• ε: A safety buffer adjustable by the platform based on risk conditions, with a default range of 0.01%–0.05%.

Percentage rates must be converted into their decimal equivalents for calculation.

3. Calculation Frequency and Applicable Period

• Calculation Frequency: Once daily
• Rate Application Period: From 04:00 on the current day to 04:00 on the following day, Beijing Time (UTC+8)
• Charging Time: Daily at 04:00 Beijing Time (UTC+8)

Before opening a position or holding it across the charging time, check the rate published by the platform and assess the associated holding costs.

4. Rate Limits and Temporary Adjustments

1. Rate Cap: The daily overnight fee rate will not exceed 10%.
2. Negative Funding Rates: When reference market funding rates are negative, the platform will still charge a minimum platform service fee of 0.5%.
3. Temporary Adjustments: If extremely high or low funding rates or other extreme market conditions persist, the platform may temporarily adjust the mechanism for risk management purposes. Please refer to formal platform notices.

5. Calculation Example

Suppose User A opens a BTC Quick Contracts long position with a notional value of 10,000 USDT at 18:00 on July 8 and holds it until 04:00 on July 9 (UTC+8).

If the overnight fee rate applicable at that charging time is 1.25%:

Overnight Fee = 10,000 × 1.25% = 125 USDT

The system will automatically deduct 125 USDT at that time.

If the user fully closes the position before that charging time, no overnight fee will be charged for that position at that time.

These figures are illustrative and do not represent the actual applicable rate.

6. Scope and Effective Time

• Applicable Products: All Quick Contracts products on SUNX.
• Excluded Products: Perpetual contracts, options contracts, and other products.
• Effective Time: As specified in the platform’s formal announcement.

Users may check overnight fee rates and policy details on the relevant platform pages.

7. Risk and Operational Reminders

1. Assess holding costs: Overnight fees are calculated on the position’s notional value, rather than only the margin invested. Include these fees in your trading cost assessment.
2. Monitor dynamic rates: Overnight fee rates may change with reference market data and risk parameters. Historical rates should not be treated as fixed future rates.
3. Plan position management: If you intend to close a position before the charging time, allow sufficient time and verify actual execution and position status.
4. Check fee records: After fees are charged, review account funds and the relevant fee records.
5. Contact official channels: If you have questions about rates, deductions, or applicable rules, contact SUNX’s official customer support or consult the Help Center.

SUNX will continue improving product mechanisms and fee disclosures to provide clearer and more transparent trading services.

Thank you for your understanding and support of SUNX.

SUNX Global Operations Team