Add sideways max-loss to perpetual-options calculator.
Show premium wipeout plus flat round-trip perp fees as case C for both size and points modes. Co-authored-by: Cursor <cursoragent@cursor.com>
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@@ -65,6 +65,19 @@ API:`POST /api/calculator/perp-options`
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组合净利 = 期权净利 + 永续亏损
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```
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**C · 横盘(最大亏损)**
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波动≈0、期权到期无内在价值:
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```text
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永续盈亏 ≈ 0
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永续开平手续费 = 2 × 现价 × 1 × 0.05% (同价开平)
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最大亏损 = 权利金总额 + 永续开平手续费
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组合净利 = −最大亏损
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```
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忽略资金费 / Theta 过程中的中间态;口径与「权利金按全亏」一致。
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### 手测示例
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现价 1800、波动 50 点、目标盈利 15、期权杠杆 100、永续杠杆 10:
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@@ -126,6 +139,7 @@ move = (目标 + 权利金) / (期权币数 − 1)
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|------|----------------|
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| A 永续方向对(净利=15) | ≈52.83 |
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| B 组合净利=15 | 51.00 |
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| C 横盘最大亏损 | 37.80(权利金 36 + 同价开平费 1.8) |
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---
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