# Contract Information

To further enhance the stability of the platform's trading mechanism and its risk management capabilities, Top.one will adjust the Maintenance Margin Rate (MMR) and fee rates for contract trading pairs at 21:00 (UTC+8) on July 21, 2025. The specific adjustment parameters are as follows:

#### I. Maintenance Margin Rate (MMR) Adjustment

* Applicable to BTC/ETH Contracts:

| Tier | Leverage              | Maintenance Margin Rate |
| ---- | --------------------- | ----------------------- |
| 1    | 1-5                   | 7.000%                  |
| 2    | 6-10                  | 3.500%                  |
| 3    | 11-20                 | 1.750%                  |
| 4    | 21-50                 | 0.700%                  |
| 5    | 51-75                 | 0.470%                  |
| 6    | 76-100                | 0.350%                  |
| 7    | 101-200               | 0.175%                  |
| 8    | 201-300               | 0.117%                  |
| 9    | 301-400               | 0.088%                  |
| 10   | 401-499               | 0.070%                  |
| 11   | 500-599               | 0.040%                  |
| 12   | 600-699               | 0.030%                  |
| 13   | 700-799               | 0.020%                  |
| 14   | 800-899               | 0.015%                  |
| 15   | 900-1000              | 0.010%                  |
| 16   | <p></p><p> > 1001</p> | 0.00001%                |

Applicable to All Coin Pairs Except BTC/ETH:

| Tier | Leverage              | Maintenance Margin Rate |
| ---- | --------------------- | ----------------------- |
| 1    | 1-5                   | 8.000%                  |
| 2    | 6-10                  | 4.000%                  |
| 3    | 11-20                 | 2.000%                  |
| 4    | 21-50                 | 0.800%                  |
| 5    | 51-75                 | 0.5371%                 |
| 6    | 76-100                | 0.400%                  |
| 7    | 101-200               | 0.200%                  |
| 8    | 201-300               | 0.1337%                 |
| 9    | 301-400               | 0.100%                  |
| 10   | 401-499               | 0.080%                  |
| 11   | 500-599               | 0.0457%                 |
| 12   | 600-699               | 0.0343%                 |
| 13   | 700-799               | 0.0229%                 |
| 14   | 800-899               | 0.0171%                 |
| 15   | 900-1000              | 0.0114%                 |
| 16   | <p></p><p> > 1001</p> | 0.0000%                 |

#### II. Fee Rate Adjustment

* Standard Contract Mode:

| Tier  | Before | After |
| ----- | ------ | ----- |
| Open  | 0.02%  | 0.02% |
| Close | 0.02%  | 0.04% |

<br>

* Strength Contract Fee Calculation Method:\
  Strength Contract Closing Fee Rate = max (Unrealized Profit/Loss \* Share Rate / Notional Amount, Minimum Closing Fee Rate)\
  **Parameter Explanation:**
  * Share Rate: 20%
  * Minimum Closing Fee Rate: 0.03%
  * Notional Amount: Closing Price × Position Quantity

#### Rules Explanation:

1. **Initial Margin Calculation Formula:**\
   Initial Margin = Notional Value of the Contract ÷ Leverage Multiplier
2. **Maintenance Margin Calculation Formula:**\
   Maintenance Margin = Notional Value of the Contract × Maintenance Margin Rate
3. **Leverage Multiplier and Risk Control:**\
   Different leverage multipliers correspond to different maintenance margin rates. The higher the leverage multiplier, the lower the maintenance margin rate, but this also implies higher trading risks. Please select an appropriate leverage multiplier based on your risk tolerance.
4. **Liquidation Rules:**\
   When your account's margin ratio falls below the maintenance margin rate, the system will trigger a liquidation mechanism, closing part or all of your positions to ensure account risk remains controllable.

<br>

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