diff --git a/lib/common/static/options_panel.js b/lib/common/static/options_panel.js
index 96ad516..4b05140 100644
--- a/lib/common/static/options_panel.js
+++ b/lib/common/static/options_panel.js
@@ -878,12 +878,21 @@
     return Math.round((c + p) * 10000) / 10000;
   }
 
-  function formatStraddleBand(strike, combinedAsk) {
-    const per = combinedAsk;
-    if (strike == null || per == null) return "—";
+  function formatStraddleBand(strike, combinedAsk, callAsk, putAsk) {
     const k = Number(strike);
+    if (!Number.isFinite(k)) return "—";
+    if (isCoinMarginMode()) {
+      const pc = Number(callAsk);
+      const pp = Number(putAsk);
+      if (!Number.isFinite(pc) || !Number.isFinite(pp) || pc <= 0 || pp <= 0 || pc >= 1) return "—";
+      const lo = Math.round((k / (1 + pp)) * 10) / 10;
+      const hi = Math.round((k / (1 - pc)) * 10) / 10;
+      return lo.toFixed(0) + " ~ " + hi.toFixed(0);
+    }
+    const per = combinedAsk;
+    if (per == null) return "—";
     const d = Number(per);
-    if (!Number.isFinite(k) || !Number.isFinite(d)) return "—";
+    if (!Number.isFinite(d)) return "—";
     const lo = Math.round((k - d) * 10) / 10;
     const hi = Math.round((k + d) * 10) / 10;
     return lo.toFixed(0) + " ~ " + hi.toFixed(0);
@@ -1577,7 +1586,7 @@
         '<td class="opt-t-call opt-row-actions">' + pickBtnHtml(call && call.inst_id) + "</td>" +
         '<td class="opt-t-mid opt-t-strike"><strong>' + row.strike + "</strong></td>" +
         '<td class="opt-t-mid opt-t-straddle-prem">' + formatStraddlePremiumCell(call && call.ask, put && put.ask) + "</td>" +
-        '<td class="opt-t-mid opt-t-straddle-band">' + formatStraddleBand(row.strike, combined) + "</td>" +
+        '<td class="opt-t-mid opt-t-straddle-band">' + formatStraddleBand(row.strike, combined, call && call.ask, put && put.ask) + "</td>" +
         '<td class="opt-t-put">' + (put ? moneynessBadge(put) : "—") + "</td>" +
         '<td class="opt-t-put opt-px-sz">' + (put ? fmtPxSz(put.ask, put.ask_sz, put.ask_estimated) : "—") + "</td>" +
         '<td class="opt-t-put opt-row-actions">' + pickBtnHtml(put && put.inst_id) + "</td>";
diff --git a/lib/exchange/okx_options_lib.py b/lib/exchange/okx_options_lib.py
index 0055a06..04edc80 100644
--- a/lib/exchange/okx_options_lib.py
+++ b/lib/exchange/okx_options_lib.py
@@ -816,6 +816,7 @@ def build_option_chain(
             family = f"{u}-USD_UM"
     uly = f"{u}-USD"
     idx = index_px if index_px is not None else fetch_index_price(ex, uly)
+    chain_margin = "usdc" if "_UM" in family.upper() else "coin"
     now_ms = time.time() * 1000
     max_ms = now_ms + max_dte_days * 86400 * 1000
     instruments_err = ""
@@ -884,6 +885,8 @@ def build_option_chain(
             strike=strike,
             ask_px=ask,
             mark_px=mark,
+            inst_id=inst_id,
+            margin_mode=chain_margin,
         )
         mny = option_moneyness(opt_type=opt_type, strike=strike, index_px=idx)
         exp_key = str(exp_ms)
@@ -1028,6 +1031,7 @@ def quote_option_contract(ex: ccxt.okx, inst_id: str) -> dict[str, Any]:
             strike=strike,
             ask_px=book_ask if can_open else None,
             mark_px=mark,
+            inst_id=inst_id,
         )
         return {
             "ok": True,
@@ -1815,6 +1819,8 @@ def format_position_row(
         strike=strike,
         avg_px=avg,
         be_px_api=_safe_float(pos.get("bePx")),
+        inst_id=inst_id,
+        margin_mode=row_mode,
     )
     close_be = close_breakeven_idx(
         opt_type=str(opt_type or ""),
diff --git a/lib/options/options_pricing_lib.py b/lib/options/options_pricing_lib.py
index d591f16..f679af7 100644
--- a/lib/options/options_pricing_lib.py
+++ b/lib/options/options_pricing_lib.py
@@ -438,10 +438,20 @@ def expiry_breakeven_from_ask(
     strike: float | None,
     ask_px: float | None,
     mark_px: float | None = None,
+    quote_in_coin: bool | None = None,
+    inst_id: str | None = None,
+    margin_mode: str | None = None,
 ) -> float | None:
     """买入前预估到期平衡:权利金按卖一;无卖一时回退标记价."""
     prem = ask_px if ask_px is not None and ask_px > 0 else mark_px
-    return expiry_breakeven_px(opt_type=opt_type, strike=strike, avg_px=prem)
+    return expiry_breakeven_px(
+        opt_type=opt_type,
+        strike=strike,
+        avg_px=prem,
+        quote_in_coin=quote_in_coin,
+        inst_id=inst_id,
+        margin_mode=margin_mode,
+    )
 
 
 def expiry_breakeven_px(
@@ -450,17 +460,39 @@ def expiry_breakeven_px(
     strike: float | None,
     avg_px: float | None,
     be_px_api: float | None = None,
+    quote_in_coin: bool | None = None,
+    inst_id: str | None = None,
+    margin_mode: str | None = None,
 ) -> float | None:
     """到期平衡点:持有至到期时标的指数盈亏为 0 的价格.优先 OKX bePx."""
     if be_px_api is not None and be_px_api > 0:
         return round(float(be_px_api), 2)
     if strike is None or avg_px is None:
         return None
+    try:
+        k = float(strike)
+        p = float(avg_px)
+    except (TypeError, ValueError):
+        return None
+    if p <= 0:
+        return None
     o = (opt_type or "").upper()
+    coin = _quote_in_coin_from_context(
+        quote_in_coin=quote_in_coin, inst_id=inst_id, margin_mode=margin_mode
+    )
+    if coin:
+        # 币本位:权利金为币报价;到期结算 payoff 亦为币 → K/(1±p)
+        if o == "C":
+            if p >= 1:
+                return None
+            return round(k / (1 - p), 2)
+        if o == "P":
+            return round(k / (1 + p), 2)
+        return None
     if o == "C":
-        return round(strike + avg_px, 2)
+        return round(k + p, 2)
     if o == "P":
-        return round(strike - avg_px, 2)
+        return round(k - p, 2)
     return None
 
 
@@ -617,12 +649,24 @@ def straddle_premium_total(
 
 def straddle_breakeven_band(
     strike: float | None,
-    combined_ask_per_unit: float | None,
+    combined_ask_per_unit: float | None = None,
+    *,
+    call_ask: float | None = None,
+    put_ask: float | None = None,
+    quote_in_coin: bool = False,
 ) -> tuple[float | None, float | None]:
-    """跨式到期平衡带:下平衡 ~ 上平衡(按双卖一报价和)."""
-    if strike is None or combined_ask_per_unit is None:
+    """跨式到期平衡带:下平衡 ~ 上平衡."""
+    if strike is None:
         return None, None
     k = float(strike)
+    if quote_in_coin:
+        pc = _safe_px(call_ask)
+        pp = _safe_px(put_ask)
+        if pc is None or pp is None or pc <= 0 or pp <= 0 or pc >= 1:
+            return None, None
+        return round(k / (1 + pp), 2), round(k / (1 - pc), 2)
+    if combined_ask_per_unit is None:
+        return None, None
     d = float(combined_ask_per_unit)
     return round(k - d, 2), round(k + d, 2)
 
diff --git a/lib/options/templates/options_panel.html b/lib/options/templates/options_panel.html
index 2e9596a..99fcc3c 100644
--- a/lib/options/templates/options_panel.html
+++ b/lib/options/templates/options_panel.html
@@ -345,7 +345,7 @@
                     </div>
                 </div>
             </div>
-            <details class="opt-pos-transfer" id="opt-pos-transfer" open>
+            <details class="opt-pos-transfer" id="opt-pos-transfer">
                 <summary class="opt-pos-transfer-head">
                     <span class="opt-pos-transfer-title">划转</span>
                     <span class="opt-pos-transfer-open-hint muted">收起</span>
@@ -380,4 +380,4 @@
     </div>
 </div>
 <script src="/static/options_expiry_countdown.js?v=1"></script>
-<script src="/static/options_panel.js?v=68"></script>
+<script src="/static/options_panel.js?v=69"></script>
diff --git a/tests/test_options_pricing.py b/tests/test_options_pricing.py
index 4b85102..b0d6cd4 100644
--- a/tests/test_options_pricing.py
+++ b/tests/test_options_pricing.py
@@ -331,6 +331,37 @@ def test_expiry_breakeven_call_put():
     assert expiry_breakeven_px(opt_type="P", strike=3500, avg_px=15.6) == 3484.4
 
 
+def test_expiry_breakeven_coin_margin():
+    from lib.options.options_pricing_lib import expiry_breakeven_from_ask, expiry_breakeven_px
+
+    # ETH-USD 币本位:卖一 0.0165 → 到期平衡 K/(1-p),非 K+p
+    assert expiry_breakeven_px(
+        opt_type="C", strike=2390, avg_px=0.0165, margin_mode="coin"
+    ) == round(2390 / (1 - 0.0165), 2)
+    assert expiry_breakeven_px(
+        opt_type="P", strike=2450, avg_px=0.0161, margin_mode="coin"
+    ) == round(2450 / (1 + 0.0161), 2)
+    assert expiry_breakeven_from_ask(
+        opt_type="C",
+        strike=2425,
+        ask_px=0.0187,
+        inst_id="ETH-USD-260823-2425-C",
+    ) == round(2425 / (1 - 0.0187), 2)
+
+
+def test_straddle_breakeven_band_coin():
+    from lib.options.options_pricing_lib import straddle_breakeven_band
+
+    lo, hi = straddle_breakeven_band(
+        2425,
+        quote_in_coin=True,
+        call_ask=0.0187,
+        put_ask=0.0253,
+    )
+    assert lo == round(2425 / (1 + 0.0253), 2)
+    assert hi == round(2425 / (1 - 0.0187), 2)
+
+
 def test_close_breakeven_at_mark_equals_avg():
     from lib.options.options_pricing_lib import close_breakeven_idx