Merge pull request 'feat: 국내주식 지정가 전환 및 미체결 처리 (#232)' (#234) from feature/issue-232-domestic-limit-order-pending into main

Reviewed-on: #234

docs/requirements-log.md

@@ -292,3 +292,33 @@ Order result: 모의투자 매수주문이 완료 되었습니다.  ✓
 ```
 
 **이슈/PR:** #149, #150
+
+---
+
+## 2026-02-23
+
+### 국내주식 지정가 전환 및 미체결 처리 (#232)
+
+**배경:**
+- 해외주식은 #211에서 지정가로 전환했으나 국내주식은 여전히 `price=0` (시장가)
+- KRX도 지정가 주문 사용 시 동일한 미체결 위험이 존재
+- 지정가 전환 + 미체결 처리를 함께 구현
+
+**구현 내용:**
+
+1. `src/broker/kis_api.py`
+   - `get_domestic_pending_orders()`: 모의 즉시 `[]`, 실전 `TTTC0084R` GET
+   - `cancel_domestic_order()`: 실전 `TTTC0013U` / 모의 `VTTC0013U`, hashkey 필수
+
+2. `src/main.py`
+   - import `kr_round_down` 추가
+   - `trading_cycle`, `run_daily_session` 국내 주문 `price=0` → 지정가:
+     BUY +0.2% / SELL -0.2%, `kr_round_down` KRX 틱 반올림 적용
+   - `handle_domestic_pending_orders` 함수: BUY→취소+쿨다운, SELL→취소+재주문(-0.4%, 최대1회)
+   - daily/realtime 두 모드에서 domestic pending 체크 호출 추가
+
+3. 테스트 14개 추가:
+   - `TestGetDomesticPendingOrders` (3), `TestCancelDomesticOrder` (5)
+   - `TestHandleDomesticPendingOrders` (4), `TestDomesticLimitOrderPrice` (2)
+
+**이슈/PR:** #232, PR #233

src/broker/kis_api.py

@@ -8,7 +8,7 @@ from __future__ import annotations
 import asyncio
 import logging
 import ssl
-from typing import Any
+from typing import Any, cast
 
 import aiohttp
 
@@ -478,6 +478,112 @@ class KISBroker:
         except (TimeoutError, aiohttp.ClientError) as exc:
             raise ConnectionError(f"Network error fetching rankings: {exc}") from exc
 
+    async def get_domestic_pending_orders(self) -> list[dict[str, Any]]:
+        """Fetch unfilled (pending) domestic limit orders.
+
+        The KIS pending-orders API (TTTC0084R) is unsupported in paper (VTS)
+        mode, so this method returns an empty list immediately when MODE is
+        not "live".
+
+        Returns:
+            List of pending order dicts from the KIS ``output`` field.
+            Each dict includes keys such as ``odno``, ``orgn_odno``,
+            ``ord_gno_brno``, ``psbl_qty``, ``sll_buy_dvsn_cd``, ``pdno``.
+        """
+        if self._settings.MODE != "live":
+            logger.debug(
+                "get_domestic_pending_orders: paper mode — TTTC0084R unsupported, returning []"
+            )
+            return []
+
+        await self._rate_limiter.acquire()
+        session = self._get_session()
+
+        # TR_ID: 실전 TTTC0084R (모의 미지원)
+        # Source: 한국투자증권 오픈API 전체문서 (20260221) — '주식 미체결조회' 시트
+        headers = await self._auth_headers("TTTC0084R")
+        params = {
+            "CANO": self._account_no,
+            "ACNT_PRDT_CD": self._product_cd,
+            "INQR_DVSN_1": "0",
+            "INQR_DVSN_2": "0",
+            "CTX_AREA_FK100": "",
+            "CTX_AREA_NK100": "",
+        }
+        url = f"{self._base_url}/uapi/domestic-stock/v1/trading/inquire-psbl-rvsecncl"
+
+        try:
+            async with session.get(url, headers=headers, params=params) as resp:
+                if resp.status != 200:
+                    text = await resp.text()
+                    raise ConnectionError(
+                        f"get_domestic_pending_orders failed ({resp.status}): {text}"
+                    )
+                data = await resp.json()
+                return data.get("output", []) or []
+        except (TimeoutError, aiohttp.ClientError) as exc:
+            raise ConnectionError(
+                f"Network error fetching domestic pending orders: {exc}"
+            ) from exc
+
+    async def cancel_domestic_order(
+        self,
+        stock_code: str,
+        orgn_odno: str,
+        krx_fwdg_ord_orgno: str,
+        qty: int,
+    ) -> dict[str, Any]:
+        """Cancel an unfilled domestic limit order.
+
+        Args:
+            stock_code: 6-digit domestic stock code (``pdno``).
+            orgn_odno: Original order number from pending-orders response
+                (``orgn_odno`` field).
+            krx_fwdg_ord_orgno: KRX forwarding order branch number from
+                pending-orders response (``ord_gno_brno`` field).
+            qty: Quantity to cancel (use ``psbl_qty`` from pending order).
+
+        Returns:
+            Raw KIS API response dict (check ``rt_cd == "0"`` for success).
+        """
+        await self._rate_limiter.acquire()
+        session = self._get_session()
+
+        # TR_ID: 실전 TTTC0013U, 모의 VTTC0013U
+        # Source: 한국투자증권 오픈API 전체문서 (20260221) — '주식주문(정정취소)' 시트
+        tr_id = "TTTC0013U" if self._settings.MODE == "live" else "VTTC0013U"
+
+        body = {
+            "CANO": self._account_no,
+            "ACNT_PRDT_CD": self._product_cd,
+            "KRX_FWDG_ORD_ORGNO": krx_fwdg_ord_orgno,
+            "ORGN_ODNO": orgn_odno,
+            "ORD_DVSN": "00",
+            "ORD_QTY": str(qty),
+            "ORD_UNPR": "0",
+            "RVSE_CNCL_DVSN_CD": "02",
+            "QTY_ALL_ORD_YN": "Y",
+        }
+
+        hash_key = await self._get_hash_key(body)
+        headers = await self._auth_headers(tr_id)
+        headers["hashkey"] = hash_key
+
+        url = f"{self._base_url}/uapi/domestic-stock/v1/trading/order-rvsecncl"
+
+        try:
+            async with session.post(url, headers=headers, json=body) as resp:
+                if resp.status != 200:
+                    text = await resp.text()
+                    raise ConnectionError(
+                        f"cancel_domestic_order failed ({resp.status}): {text}"
+                    )
+                return cast(dict[str, Any], await resp.json())
+        except (TimeoutError, aiohttp.ClientError) as exc:
+            raise ConnectionError(
+                f"Network error cancelling domestic order: {exc}"
+            ) from exc
+
     async def get_daily_prices(
         self,
         stock_code: str,

src/broker/overseas.py

@@ -29,6 +29,20 @@ _RANKING_EXCHANGE_MAP: dict[str, str] = {
 # NASD → NAS, NYSE → NYS, AMEX → AMS (confirmed: AMEX returns empty, AMS returns price).
 _PRICE_EXCHANGE_MAP: dict[str, str] = _RANKING_EXCHANGE_MAP
 
+# Cancel order TR_IDs per exchange code — (live_tr_id, paper_tr_id).
+# Source: 한국투자증권 오픈API 전체문서 (20260221) — '해외주식 주문취소' 시트
+_CANCEL_TR_ID_MAP: dict[str, tuple[str, str]] = {
+    "NASD": ("TTTT1004U", "VTTT1004U"),
+    "NYSE": ("TTTT1004U", "VTTT1004U"),
+    "AMEX": ("TTTT1004U", "VTTT1004U"),
+    "SEHK": ("TTTS1003U", "VTTS1003U"),
+    "TSE":  ("TTTS0309U", "VTTS0309U"),
+    "SHAA": ("TTTS0302U", "VTTS0302U"),
+    "SZAA": ("TTTS0306U", "VTTS0306U"),
+    "HNX":  ("TTTS0312U", "VTTS0312U"),
+    "HSX":  ("TTTS0312U", "VTTS0312U"),
+}
+
 
 class OverseasBroker:
     """KIS Overseas Stock API wrapper that reuses KISBroker infrastructure."""
@@ -292,6 +306,131 @@ class OverseasBroker:
                 f"Network error sending overseas order: {exc}"
             ) from exc
 
+    async def get_overseas_pending_orders(
+        self, exchange_code: str
+    ) -> list[dict[str, Any]]:
+        """Fetch unfilled (pending) overseas orders for a given exchange.
+
+        Args:
+            exchange_code: Exchange code (e.g., "NASD", "SEHK").
+                For US markets, NASD returns all US pending orders (NASD/NYSE/AMEX).
+
+        Returns:
+            List of pending order dicts with fields: odno, pdno, sll_buy_dvsn_cd,
+            ft_ord_qty, nccs_qty, ft_ord_unpr3, ovrs_excg_cd.
+            Always returns [] in paper mode (TTTS3018R is live-only).
+
+        Raises:
+            ConnectionError: On network or API errors (live mode only).
+        """
+        if self._broker._settings.MODE != "live":
+            logger.debug(
+                "Pending orders API (TTTS3018R) not supported in paper mode; returning []"
+            )
+            return []
+
+        await self._broker._rate_limiter.acquire()
+        session = self._broker._get_session()
+
+        # TTTS3018R: 해외주식 미체결내역조회 (실전 전용)
+        # Source: 한국투자증권 오픈API 전체문서 (20260221) — '해외주식 미체결조회' 시트
+        headers = await self._broker._auth_headers("TTTS3018R")
+        params = {
+            "CANO": self._broker._account_no,
+            "ACNT_PRDT_CD": self._broker._product_cd,
+            "OVRS_EXCG_CD": exchange_code,
+            "SORT_SQN": "DS",
+            "CTX_AREA_FK200": "",
+            "CTX_AREA_NK200": "",
+        }
+        url = (
+            f"{self._broker._base_url}/uapi/overseas-stock/v1/trading/inquire-nccs"
+        )
+
+        try:
+            async with session.get(url, headers=headers, params=params) as resp:
+                if resp.status != 200:
+                    text = await resp.text()
+                    raise ConnectionError(
+                        f"get_overseas_pending_orders failed ({resp.status}): {text}"
+                    )
+                data = await resp.json()
+                output = data.get("output", [])
+                if isinstance(output, list):
+                    return output
+                return []
+        except (TimeoutError, aiohttp.ClientError) as exc:
+            raise ConnectionError(
+                f"Network error fetching pending orders: {exc}"
+            ) from exc
+
+    async def cancel_overseas_order(
+        self,
+        exchange_code: str,
+        stock_code: str,
+        odno: str,
+        qty: int,
+    ) -> dict[str, Any]:
+        """Cancel an overseas limit order.
+
+        Args:
+            exchange_code: Exchange code (e.g., "NASD", "SEHK").
+            stock_code: Stock ticker symbol.
+            odno: Original order number to cancel.
+            qty: Unfilled quantity to cancel.
+
+        Returns:
+            API response dict containing rt_cd and msg1.
+
+        Raises:
+            ValueError: If exchange_code has no cancel TR_ID mapping.
+            ConnectionError: On network or API errors.
+        """
+        tr_ids = _CANCEL_TR_ID_MAP.get(exchange_code)
+        if tr_ids is None:
+            raise ValueError(f"No cancel TR_ID mapping for exchange: {exchange_code}")
+        live_tr_id, paper_tr_id = tr_ids
+        tr_id = live_tr_id if self._broker._settings.MODE == "live" else paper_tr_id
+
+        await self._broker._rate_limiter.acquire()
+        session = self._broker._get_session()
+
+        # RVSE_CNCL_DVSN_CD="02" means cancel (not revision).
+        # OVRS_ORD_UNPR must be "0" for cancellations.
+        # Source: 한국투자증권 오픈API 전체문서 (20260221) — '해외주식 정정취소주문' 시트
+        body = {
+            "CANO": self._broker._account_no,
+            "ACNT_PRDT_CD": self._broker._product_cd,
+            "OVRS_EXCG_CD": exchange_code,
+            "PDNO": stock_code,
+            "ORGN_ODNO": odno,
+            "RVSE_CNCL_DVSN_CD": "02",
+            "ORD_QTY": str(qty),
+            "OVRS_ORD_UNPR": "0",
+            "ORD_SVR_DVSN_CD": "0",
+        }
+
+        hash_key = await self._broker._get_hash_key(body)
+        headers = await self._broker._auth_headers(tr_id)
+        headers["hashkey"] = hash_key
+
+        url = (
+            f"{self._broker._base_url}/uapi/overseas-stock/v1/trading/order-rvsecncl"
+        )
+
+        try:
+            async with session.post(url, headers=headers, json=body) as resp:
+                if resp.status != 200:
+                    text = await resp.text()
+                    raise ConnectionError(
+                        f"cancel_overseas_order failed ({resp.status}): {text}"
+                    )
+                return await resp.json()
+        except (TimeoutError, aiohttp.ClientError) as exc:
+            raise ConnectionError(
+                f"Network error cancelling overseas order: {exc}"
+            ) from exc
+
     def _get_currency_code(self, exchange_code: str) -> str:
         """
         Map exchange code to currency code.

src/main.py

@@ -19,7 +19,7 @@ from src.analysis.smart_scanner import ScanCandidate, SmartVolatilityScanner
 from src.analysis.volatility import VolatilityAnalyzer
 from src.brain.context_selector import ContextSelector
 from src.brain.gemini_client import GeminiClient, TradeDecision
-from src.broker.kis_api import KISBroker
+from src.broker.kis_api import KISBroker, kr_round_down
 from src.broker.overseas import OverseasBroker
 from src.config import Settings
 from src.context.aggregator import ContextAggregator
@@ -853,28 +853,39 @@ async def trading_cycle(
         # 5. Send order
         order_succeeded = True
         if market.is_domestic:
+            # Use limit orders (지정가) for domestic stocks to avoid market order
+            # quantity calculation issues. KRX tick rounding applied via kr_round_down.
+            # BUY: +0.2% — ensures fill even when ask is slightly above last price.
+            # SELL: -0.2% — ensures fill even when bid is slightly below last price.
+            if decision.action == "BUY":
+                order_price = kr_round_down(current_price * 1.002)
+            else:
+                order_price = kr_round_down(current_price * 0.998)
             result = await broker.send_order(
                 stock_code=stock_code,
                 order_type=decision.action,
                 quantity=quantity,
-                price=0,  # market order
+                price=order_price,
             )
         else:
-            # For overseas orders:
+            # For overseas orders, always use limit orders (지정가):
-            # - KIS VTS only accepts limit orders (지정가만 가능)
+            # - KIS market orders (ORD_DVSN=01) calculate quantity based on upper limit
-            # - BUY: use 0.5% premium over last price to improve fill probability
+            #   price (상한가 기준), resulting in only 60-80% of intended cash being used.
-            #   (ask price is typically slightly above last, and VTS won't fill below ask)
+            # - BUY: +0.2% above last price — tight enough to minimise overpayment while
-            # - SELL: use last price as the limit
+            #   achieving >90% fill rate on large-cap US stocks.
+            # - SELL: -0.2% below last price — ensures fill even when price dips slightly
+            #   (placing at exact last price risks no-fill if the bid is just below).
+            overseas_price: float
             if decision.action == "BUY":
-                order_price = round(current_price * 1.005, 4)
+                overseas_price = round(current_price * 1.002, 4)
             else:
-                order_price = current_price
+                overseas_price = round(current_price * 0.998, 4)
             result = await overseas_broker.send_overseas_order(
                 exchange_code=market.exchange_code,
                 stock_code=stock_code,
                 order_type=decision.action,
                 quantity=quantity,
-                price=order_price,  # limit order — KIS VTS rejects market orders
+                price=overseas_price,  # limit order
             )
             # Check if KIS rejected the order (rt_cd != "0")
             if result.get("rt_cd", "") != "0":
@@ -976,6 +987,328 @@ async def trading_cycle(
         )
 
 
+async def handle_domestic_pending_orders(
+    broker: KISBroker,
+    telegram: TelegramClient,
+    settings: Settings,
+    sell_resubmit_counts: dict[str, int],
+    buy_cooldown: dict[str, float] | None = None,
+) -> None:
+    """Check and handle unfilled (pending) domestic limit orders.
+
+    Called once per market loop iteration before new orders are considered.
+    In paper mode the KIS pending-orders API (TTTC0084R) is unsupported, so
+    ``get_domestic_pending_orders`` returns [] immediately and this function
+    exits without making further API calls.
+
+    BUY pending  → cancel (to free up balance) + optionally set cooldown.
+    SELL pending → cancel then resubmit at a wider spread (-0.4% from last
+                   price, kr_round_down applied).  Resubmission is attempted
+                   at most once per key per session to avoid infinite loops.
+
+    Args:
+        broker: KISBroker instance.
+        telegram: TelegramClient for notifications.
+        settings: Application settings.
+        sell_resubmit_counts: Mutable dict tracking SELL resubmission attempts
+            per "KR:{stock_code}" key.  Passed by reference so counts persist
+            across calls within the same session.
+        buy_cooldown: Optional cooldown dict shared with the main trading loop.
+            When provided, cancelled BUY orders are added with a
+            _BUY_COOLDOWN_SECONDS expiry.
+    """
+    try:
+        orders = await broker.get_domestic_pending_orders()
+    except Exception as exc:
+        logger.warning("Failed to fetch domestic pending orders: %s", exc)
+        return
+
+    now = asyncio.get_event_loop().time()
+
+    for order in orders:
+        try:
+            stock_code = order.get("pdno", "")
+            orgn_odno = order.get("orgn_odno", "")
+            krx_fwdg_ord_orgno = order.get("ord_gno_brno", "")
+            sll_buy = order.get("sll_buy_dvsn_cd", "")  # "01"=SELL, "02"=BUY
+            psbl_qty = int(order.get("psbl_qty", "0") or "0")
+            key = f"KR:{stock_code}"
+
+            if not stock_code or not orgn_odno or psbl_qty <= 0:
+                continue
+
+            # Cancel the pending order first regardless of direction.
+            cancel_result = await broker.cancel_domestic_order(
+                stock_code=stock_code,
+                orgn_odno=orgn_odno,
+                krx_fwdg_ord_orgno=krx_fwdg_ord_orgno,
+                qty=psbl_qty,
+            )
+            if cancel_result.get("rt_cd") != "0":
+                logger.warning(
+                    "Cancel failed for KR %s: rt_cd=%s msg=%s",
+                    stock_code,
+                    cancel_result.get("rt_cd"),
+                    cancel_result.get("msg1"),
+                )
+                continue
+
+            if sll_buy == "02":
+                # BUY pending → cancelled; set cooldown to avoid immediate re-buy.
+                if buy_cooldown is not None:
+                    buy_cooldown[key] = now + _BUY_COOLDOWN_SECONDS
+                try:
+                    await telegram.notify_unfilled_order(
+                        stock_code=stock_code,
+                        market="KR",
+                        action="BUY",
+                        quantity=psbl_qty,
+                        outcome="cancelled",
+                    )
+                except Exception as notify_exc:
+                    logger.warning("notify_unfilled_order failed: %s", notify_exc)
+
+            elif sll_buy == "01":
+                # SELL pending — attempt one resubmit at a wider spread.
+                if sell_resubmit_counts.get(key, 0) >= 1:
+                    # Already resubmitted once — only cancel (already done above).
+                    logger.warning(
+                        "SELL KR %s already resubmitted once — no further resubmit",
+                        stock_code,
+                    )
+                    try:
+                        await telegram.notify_unfilled_order(
+                            stock_code=stock_code,
+                            market="KR",
+                            action="SELL",
+                            quantity=psbl_qty,
+                            outcome="cancelled",
+                        )
+                    except Exception as notify_exc:
+                        logger.warning(
+                            "notify_unfilled_order failed: %s", notify_exc
+                        )
+                else:
+                    # First unfilled SELL → resubmit at last * 0.996 (-0.4%).
+                    try:
+                        last_price, _, _ = await broker.get_current_price(stock_code)
+                        if last_price <= 0:
+                            raise ValueError(
+                                f"Invalid price ({last_price}) for {stock_code}"
+                            )
+                        new_price = kr_round_down(last_price * 0.996)
+                        await broker.send_order(
+                            stock_code=stock_code,
+                            order_type="SELL",
+                            quantity=psbl_qty,
+                            price=new_price,
+                        )
+                        sell_resubmit_counts[key] = (
+                            sell_resubmit_counts.get(key, 0) + 1
+                        )
+                        try:
+                            await telegram.notify_unfilled_order(
+                                stock_code=stock_code,
+                                market="KR",
+                                action="SELL",
+                                quantity=psbl_qty,
+                                outcome="resubmitted",
+                                new_price=float(new_price),
+                            )
+                        except Exception as notify_exc:
+                            logger.warning(
+                                "notify_unfilled_order failed: %s", notify_exc
+                            )
+                    except Exception as exc:
+                        logger.error(
+                            "SELL resubmit failed for KR %s: %s",
+                            stock_code,
+                            exc,
+                        )
+
+        except Exception as exc:
+            logger.error(
+                "Error handling domestic pending order for %s: %s",
+                order.get("pdno", "?"),
+                exc,
+            )
+
+
+async def handle_overseas_pending_orders(
+    overseas_broker: OverseasBroker,
+    telegram: TelegramClient,
+    settings: Settings,
+    sell_resubmit_counts: dict[str, int],
+    buy_cooldown: dict[str, float] | None = None,
+) -> None:
+    """Check and handle unfilled (pending) overseas limit orders.
+
+    Called once per market loop iteration before new orders are considered.
+    In paper mode the KIS pending-orders API (TTTS3018R) is unsupported, so
+    this function returns immediately without making any API calls.
+
+    BUY pending  → cancel (to free up balance) + optionally set cooldown.
+    SELL pending → cancel then resubmit at a wider spread (-0.4% from last
+                   price).  Resubmission is attempted at most once per key
+                   per session to avoid infinite retry loops.
+
+    Args:
+        overseas_broker: OverseasBroker instance.
+        telegram: TelegramClient for notifications.
+        settings: Application settings (MODE, ENABLED_MARKETS).
+        sell_resubmit_counts: Mutable dict tracking SELL resubmission attempts
+            per "{exchange_code}:{stock_code}" key.  Passed by reference so
+            counts persist across calls within the same session.
+        buy_cooldown: Optional cooldown dict shared with the main trading loop.
+            When provided, cancelled BUY orders are added with a
+            _BUY_COOLDOWN_SECONDS expiry.
+    """
+    # Determine which exchange codes to query, deduplicating US exchanges.
+    # NASD alone returns all US (NASD/NYSE/AMEX) pending orders.
+    us_exchanges = frozenset({"NASD", "NYSE", "AMEX"})
+    exchange_codes: list[str] = []
+    seen_us = False
+    for market_code in settings.enabled_market_list:
+        market_info = MARKETS.get(market_code)
+        if market_info is None or market_info.is_domestic:
+            continue
+        exc_code = market_info.exchange_code
+        if exc_code in us_exchanges:
+            if not seen_us:
+                exchange_codes.append("NASD")
+                seen_us = True
+        elif exc_code not in exchange_codes:
+            exchange_codes.append(exc_code)
+
+    now = asyncio.get_event_loop().time()
+
+    for exchange_code in exchange_codes:
+        try:
+            orders = await overseas_broker.get_overseas_pending_orders(exchange_code)
+        except Exception as exc:
+            logger.warning(
+                "Failed to fetch pending orders for %s: %s", exchange_code, exc
+            )
+            continue
+
+        for order in orders:
+            try:
+                stock_code = order.get("pdno", "")
+                odno = order.get("odno", "")
+                sll_buy = order.get("sll_buy_dvsn_cd", "")  # "01"=SELL, "02"=BUY
+                nccs_qty = int(order.get("nccs_qty", "0") or "0")
+                order_exchange = order.get("ovrs_excg_cd") or exchange_code
+                key = f"{order_exchange}:{stock_code}"
+
+                if not stock_code or not odno or nccs_qty <= 0:
+                    continue
+
+                # Cancel the pending order first regardless of direction.
+                cancel_result = await overseas_broker.cancel_overseas_order(
+                    exchange_code=order_exchange,
+                    stock_code=stock_code,
+                    odno=odno,
+                    qty=nccs_qty,
+                )
+                if cancel_result.get("rt_cd") != "0":
+                    logger.warning(
+                        "Cancel failed for %s %s: rt_cd=%s msg=%s",
+                        order_exchange,
+                        stock_code,
+                        cancel_result.get("rt_cd"),
+                        cancel_result.get("msg1"),
+                    )
+                    continue
+
+                if sll_buy == "02":
+                    # BUY pending → cancelled; set cooldown to avoid immediate re-buy.
+                    if buy_cooldown is not None:
+                        buy_cooldown[key] = now + _BUY_COOLDOWN_SECONDS
+                    try:
+                        await telegram.notify_unfilled_order(
+                            stock_code=stock_code,
+                            market=order_exchange,
+                            action="BUY",
+                            quantity=nccs_qty,
+                            outcome="cancelled",
+                        )
+                    except Exception as notify_exc:
+                        logger.warning("notify_unfilled_order failed: %s", notify_exc)
+
+                elif sll_buy == "01":
+                    # SELL pending — attempt one resubmit at a wider spread.
+                    if sell_resubmit_counts.get(key, 0) >= 1:
+                        # Already resubmitted once — only cancel (already done above).
+                        logger.warning(
+                            "SELL %s %s already resubmitted once — no further resubmit",
+                            order_exchange,
+                            stock_code,
+                        )
+                        try:
+                            await telegram.notify_unfilled_order(
+                                stock_code=stock_code,
+                                market=order_exchange,
+                                action="SELL",
+                                quantity=nccs_qty,
+                                outcome="cancelled",
+                            )
+                        except Exception as notify_exc:
+                            logger.warning(
+                                "notify_unfilled_order failed: %s", notify_exc
+                            )
+                    else:
+                        # First unfilled SELL → resubmit at last * 0.996 (-0.4%).
+                        try:
+                            price_data = await overseas_broker.get_overseas_price(
+                                order_exchange, stock_code
+                            )
+                            last_price = float(
+                                price_data.get("output", {}).get("last", "0") or "0"
+                            )
+                            if last_price <= 0:
+                                raise ValueError(
+                                    f"Invalid price ({last_price}) for {stock_code}"
+                                )
+                            new_price = round(last_price * 0.996, 4)
+                            await overseas_broker.send_overseas_order(
+                                exchange_code=order_exchange,
+                                stock_code=stock_code,
+                                order_type="SELL",
+                                quantity=nccs_qty,
+                                price=new_price,
+                            )
+                            sell_resubmit_counts[key] = (
+                                sell_resubmit_counts.get(key, 0) + 1
+                            )
+                            try:
+                                await telegram.notify_unfilled_order(
+                                    stock_code=stock_code,
+                                    market=order_exchange,
+                                    action="SELL",
+                                    quantity=nccs_qty,
+                                    outcome="resubmitted",
+                                    new_price=new_price,
+                                )
+                            except Exception as notify_exc:
+                                logger.warning(
+                                    "notify_unfilled_order failed: %s", notify_exc
+                                )
+                        except Exception as exc:
+                            logger.error(
+                                "SELL resubmit failed for %s %s: %s",
+                                order_exchange,
+                                stock_code,
+                                exc,
+                            )
+
+            except Exception as exc:
+                logger.error(
+                    "Error handling pending order for %s: %s",
+                    order.get("pdno", "?"),
+                    exc,
+                )
+
+
 async def run_daily_session(
     broker: KISBroker,
     overseas_broker: OverseasBroker,
@@ -1020,11 +1353,40 @@ async def run_daily_session(
     # BUY cooldown: prevents retrying stocks rejected for insufficient balance
     daily_buy_cooldown: dict[str, float] = {}  # "{market_code}:{stock_code}" -> expiry timestamp
 
+    # Tracks SELL resubmission attempts per "{exchange_code}:{stock_code}" (max 1 per session).
+    sell_resubmit_counts: dict[str, int] = {}
+
     # Process each open market
     for market in open_markets:
         # Use market-local date for playbook keying
         market_today = datetime.now(market.timezone).date()
 
+        # Check and handle domestic pending (unfilled) limit orders before new decisions.
+        if market.is_domestic:
+            try:
+                await handle_domestic_pending_orders(
+                    broker,
+                    telegram,
+                    settings,
+                    sell_resubmit_counts,
+                    daily_buy_cooldown,
+                )
+            except Exception as exc:
+                logger.warning("Domestic pending order check failed: %s", exc)
+
+        # Check and handle overseas pending (unfilled) limit orders before new decisions.
+        if not market.is_domestic:
+            try:
+                await handle_overseas_pending_orders(
+                    overseas_broker,
+                    telegram,
+                    settings,
+                    sell_resubmit_counts,
+                    daily_buy_cooldown,
+                )
+            except Exception as exc:
+                logger.warning("Pending order check failed: %s", exc)
+
         # Dynamic stock discovery via scanner (no static watchlists)
         candidates_list: list[ScanCandidate] = []
         fallback_stocks: list[str] | None = None
@@ -1414,11 +1776,21 @@ async def run_daily_session(
                 order_succeeded = True
                 try:
                     if market.is_domestic:
+                        # Use limit orders (지정가) for domestic stocks.
+                        # KRX tick rounding applied via kr_round_down.
+                        if decision.action == "BUY":
+                            order_price = kr_round_down(
+                                stock_data["current_price"] * 1.002
+                            )
+                        else:
+                            order_price = kr_round_down(
+                                stock_data["current_price"] * 0.998
+                            )
                         result = await broker.send_order(
                             stock_code=stock_code,
                             order_type=decision.action,
                             quantity=quantity,
-                            price=0,  # market order
+                            price=order_price,
                         )
                     else:
                         # KIS VTS only accepts limit orders; use 0.5% premium for BUY
@@ -2083,6 +2455,9 @@ async def run(settings: Settings) -> None:
     # BUY cooldown: prevents retrying a stock rejected for insufficient balance
     buy_cooldown: dict[str, float] = {}  # "{market_code}:{stock_code}" -> expiry timestamp
 
+    # Tracks SELL resubmission attempts per "{exchange_code}:{stock_code}" (max 1 until restart).
+    sell_resubmit_counts: dict[str, int] = {}
+
     # Initialize latency control system
     criticality_assessor = CriticalityAssessor(
         critical_pnl_threshold=-2.5,  # Near circuit breaker at -3.0%
@@ -2268,6 +2643,32 @@ async def run(settings: Settings) -> None:
                             logger.warning("Market open notification failed: %s", exc)
                         _market_states[market.code] = True
 
+                    # Check and handle domestic pending (unfilled) limit orders.
+                    if market.is_domestic:
+                        try:
+                            await handle_domestic_pending_orders(
+                                broker,
+                                telegram,
+                                settings,
+                                sell_resubmit_counts,
+                                buy_cooldown,
+                            )
+                        except Exception as exc:
+                            logger.warning("Domestic pending order check failed: %s", exc)
+
+                    # Check and handle overseas pending (unfilled) limit orders.
+                    if not market.is_domestic:
+                        try:
+                            await handle_overseas_pending_orders(
+                                overseas_broker,
+                                telegram,
+                                settings,
+                                sell_resubmit_counts,
+                                buy_cooldown,
+                            )
+                        except Exception as exc:
+                            logger.warning("Pending order check failed: %s", exc)
+
                     # Smart Scanner: dynamic stock discovery (no static watchlists)
                     now_timestamp = asyncio.get_event_loop().time()
                     last_scan = last_scan_time.get(market.code, 0.0)

src/notifications/telegram_client.py

@@ -473,6 +473,48 @@ class TelegramClient:
             NotificationMessage(priority=priority, message=message)
         )
 
+    async def notify_unfilled_order(
+        self,
+        stock_code: str,
+        market: str,
+        action: str,
+        quantity: int,
+        outcome: str,
+        new_price: float | None = None,
+    ) -> None:
+        """Notify about an unfilled overseas order that was cancelled or resubmitted.
+
+        Args:
+            stock_code: Stock ticker symbol.
+            market: Exchange/market code (e.g., "NASD", "SEHK").
+            action: "BUY" or "SELL".
+            quantity: Unfilled quantity.
+            outcome: "cancelled" or "resubmitted".
+            new_price: New order price if resubmitted (None if only cancelled).
+        """
+        if not self._filter.trades:
+            return
+        # SELL resubmit is high priority — position liquidation at risk.
+        # BUY cancel is medium priority — only cash is freed.
+        priority = (
+            NotificationPriority.HIGH
+            if action == "SELL"
+            else NotificationPriority.MEDIUM
+        )
+        outcome_emoji = "🔄" if outcome == "resubmitted" else "❌"
+        outcome_label = "재주문" if outcome == "resubmitted" else "취소됨"
+        action_emoji = "🔴" if action == "SELL" else "🟢"
+        lines = [
+            f"<b>{outcome_emoji} 미체결 주문 {outcome_label}</b>",
+            f"Symbol: <code>{stock_code}</code> ({market})",
+            f"Action: {action_emoji} {action}",
+            f"Quantity: {quantity:,} shares",
+        ]
+        if new_price is not None:
+            lines.append(f"New Price: {new_price:.4f}")
+        message = "\n".join(lines)
+        await self._send_notification(NotificationMessage(priority=priority, message=message))
+
     async def notify_error(
         self, error_type: str, error_msg: str, context: str
     ) -> None:

tests/test_broker.py

@@ -725,3 +725,195 @@ class TestTRIDBranchingDomestic:
 
         order_headers = mock_post.call_args_list[1][1].get("headers", {})
         assert order_headers["tr_id"] == "TTTC0011U"
+
+
+# ---------------------------------------------------------------------------
+# Domestic Pending Orders (get_domestic_pending_orders)
+# ---------------------------------------------------------------------------
+
+
+class TestGetDomesticPendingOrders:
+    """get_domestic_pending_orders must return [] in paper mode and call TTTC0084R in live."""
+
+    def _make_broker(self, settings, mode: str) -> KISBroker:
+        from src.config import Settings
+
+        s = Settings(
+            KIS_APP_KEY=settings.KIS_APP_KEY,
+            KIS_APP_SECRET=settings.KIS_APP_SECRET,
+            KIS_ACCOUNT_NO=settings.KIS_ACCOUNT_NO,
+            GEMINI_API_KEY=settings.GEMINI_API_KEY,
+            DB_PATH=":memory:",
+            ENABLED_MARKETS="KR",
+            MODE=mode,
+        )
+        b = KISBroker(s)
+        b._access_token = "tok"
+        b._token_expires_at = float("inf")
+        b._rate_limiter.acquire = AsyncMock()
+        return b
+
+    @pytest.mark.asyncio
+    async def test_paper_mode_returns_empty(self, settings) -> None:
+        """Paper mode must return [] immediately without any API call."""
+        broker = self._make_broker(settings, "paper")
+
+        with patch("aiohttp.ClientSession.get") as mock_get:
+            result = await broker.get_domestic_pending_orders()
+
+        assert result == []
+        mock_get.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_live_mode_calls_tttc0084r_with_correct_params(
+        self, settings
+    ) -> None:
+        """Live mode must call TTTC0084R with INQR_DVSN_1/2 and paging params."""
+        broker = self._make_broker(settings, "live")
+        pending = [{"odno": "001", "pdno": "005930", "psbl_qty": "10"}]
+        mock_resp = AsyncMock()
+        mock_resp.status = 200
+        mock_resp.json = AsyncMock(return_value={"output": pending})
+        mock_resp.__aenter__ = AsyncMock(return_value=mock_resp)
+        mock_resp.__aexit__ = AsyncMock(return_value=False)
+
+        with patch("aiohttp.ClientSession.get", return_value=mock_resp) as mock_get:
+            result = await broker.get_domestic_pending_orders()
+
+        assert result == pending
+        headers = mock_get.call_args[1].get("headers", {})
+        assert headers["tr_id"] == "TTTC0084R"
+        params = mock_get.call_args[1].get("params", {})
+        assert params["INQR_DVSN_1"] == "0"
+        assert params["INQR_DVSN_2"] == "0"
+
+    @pytest.mark.asyncio
+    async def test_live_mode_connection_error(self, settings) -> None:
+        """Network error must raise ConnectionError."""
+        import aiohttp as _aiohttp
+
+        broker = self._make_broker(settings, "live")
+
+        with patch(
+            "aiohttp.ClientSession.get",
+            side_effect=_aiohttp.ClientError("timeout"),
+        ):
+            with pytest.raises(ConnectionError):
+                await broker.get_domestic_pending_orders()
+
+
+# ---------------------------------------------------------------------------
+# Domestic Order Cancellation (cancel_domestic_order)
+# ---------------------------------------------------------------------------
+
+
+class TestCancelDomesticOrder:
+    """cancel_domestic_order must use correct TR_ID and build body correctly."""
+
+    def _make_broker(self, settings, mode: str) -> KISBroker:
+        from src.config import Settings
+
+        s = Settings(
+            KIS_APP_KEY=settings.KIS_APP_KEY,
+            KIS_APP_SECRET=settings.KIS_APP_SECRET,
+            KIS_ACCOUNT_NO=settings.KIS_ACCOUNT_NO,
+            GEMINI_API_KEY=settings.GEMINI_API_KEY,
+            DB_PATH=":memory:",
+            ENABLED_MARKETS="KR",
+            MODE=mode,
+        )
+        b = KISBroker(s)
+        b._access_token = "tok"
+        b._token_expires_at = float("inf")
+        b._rate_limiter.acquire = AsyncMock()
+        return b
+
+    def _make_post_mocks(self, order_payload: dict) -> tuple:
+        mock_hash = AsyncMock()
+        mock_hash.status = 200
+        mock_hash.json = AsyncMock(return_value={"HASH": "h"})
+        mock_hash.__aenter__ = AsyncMock(return_value=mock_hash)
+        mock_hash.__aexit__ = AsyncMock(return_value=False)
+
+        mock_order = AsyncMock()
+        mock_order.status = 200
+        mock_order.json = AsyncMock(return_value=order_payload)
+        mock_order.__aenter__ = AsyncMock(return_value=mock_order)
+        mock_order.__aexit__ = AsyncMock(return_value=False)
+
+        return mock_hash, mock_order
+
+    @pytest.mark.asyncio
+    async def test_live_uses_tttc0013u(self, settings) -> None:
+        """Live mode must use TR_ID TTTC0013U."""
+        broker = self._make_broker(settings, "live")
+        mock_hash, mock_order = self._make_post_mocks({"rt_cd": "0"})
+
+        with patch(
+            "aiohttp.ClientSession.post", side_effect=[mock_hash, mock_order]
+        ) as mock_post:
+            await broker.cancel_domestic_order("005930", "ORD001", "BRNO01", 5)
+
+        order_headers = mock_post.call_args_list[1][1].get("headers", {})
+        assert order_headers["tr_id"] == "TTTC0013U"
+
+    @pytest.mark.asyncio
+    async def test_paper_uses_vttc0013u(self, settings) -> None:
+        """Paper mode must use TR_ID VTTC0013U."""
+        broker = self._make_broker(settings, "paper")
+        mock_hash, mock_order = self._make_post_mocks({"rt_cd": "0"})
+
+        with patch(
+            "aiohttp.ClientSession.post", side_effect=[mock_hash, mock_order]
+        ) as mock_post:
+            await broker.cancel_domestic_order("005930", "ORD001", "BRNO01", 5)
+
+        order_headers = mock_post.call_args_list[1][1].get("headers", {})
+        assert order_headers["tr_id"] == "VTTC0013U"
+
+    @pytest.mark.asyncio
+    async def test_cancel_sets_rvse_cncl_dvsn_cd_02(self, settings) -> None:
+        """Body must have RVSE_CNCL_DVSN_CD='02' (취소) and QTY_ALL_ORD_YN='Y'."""
+        broker = self._make_broker(settings, "live")
+        mock_hash, mock_order = self._make_post_mocks({"rt_cd": "0"})
+
+        with patch(
+            "aiohttp.ClientSession.post", side_effect=[mock_hash, mock_order]
+        ) as mock_post:
+            await broker.cancel_domestic_order("005930", "ORD001", "BRNO01", 5)
+
+        body = mock_post.call_args_list[1][1].get("json", {})
+        assert body["RVSE_CNCL_DVSN_CD"] == "02"
+        assert body["QTY_ALL_ORD_YN"] == "Y"
+        assert body["ORD_UNPR"] == "0"
+
+    @pytest.mark.asyncio
+    async def test_cancel_sets_krx_fwdg_ord_orgno_in_body(self, settings) -> None:
+        """Body must include KRX_FWDG_ORD_ORGNO and ORGN_ODNO from arguments."""
+        broker = self._make_broker(settings, "live")
+        mock_hash, mock_order = self._make_post_mocks({"rt_cd": "0"})
+
+        with patch(
+            "aiohttp.ClientSession.post", side_effect=[mock_hash, mock_order]
+        ) as mock_post:
+            await broker.cancel_domestic_order("005930", "ORD123", "BRN456", 3)
+
+        body = mock_post.call_args_list[1][1].get("json", {})
+        assert body["KRX_FWDG_ORD_ORGNO"] == "BRN456"
+        assert body["ORGN_ODNO"] == "ORD123"
+        assert body["ORD_QTY"] == "3"
+
+    @pytest.mark.asyncio
+    async def test_cancel_sets_hashkey_header(self, settings) -> None:
+        """Request must include hashkey header (same pattern as send_order)."""
+        broker = self._make_broker(settings, "live")
+        mock_hash, mock_order = self._make_post_mocks({"rt_cd": "0"})
+
+        with patch(
+            "aiohttp.ClientSession.post", side_effect=[mock_hash, mock_order]
+        ) as mock_post:
+            await broker.cancel_domestic_order("005930", "ORD001", "BRNO01", 2)
+
+        order_headers = mock_post.call_args_list[1][1].get("headers", {})
+        assert "hashkey" in order_headers
+        assert order_headers["hashkey"] == "h"

tests/test_main.py

@@ -22,6 +22,8 @@ from src.main import (
     _run_context_scheduler,
     _run_evolution_loop,
     _start_dashboard_server,
+    handle_domestic_pending_orders,
+    handle_overseas_pending_orders,
     run_daily_session,
     safe_float,
     sync_positions_from_broker,
@@ -1105,10 +1107,11 @@ class TestOverseasBalanceParsing:
         mock_telegram: MagicMock,
         mock_overseas_market: MagicMock,
     ) -> None:
-        """Overseas BUY order must use current_price (limit), not 0 (market).
+        """Overseas BUY order must use current_price +0.2% limit, not market order.
 
-        KIS VTS rejects market orders for overseas paper trading.
+        KIS market orders (ORD_DVSN=01) calculate quantity based on upper limit price
-        Regression test for issue #149.
+        (상한가 기준), resulting in only 60-80% of intended cash being used.
+        Regression test for issue #149 / #211.
         """
         mock_telegram.notify_trade_execution = AsyncMock()
 
@@ -1129,14 +1132,93 @@ class TestOverseasBalanceParsing:
                 scan_candidates={},
             )
 
-        # Verify limit order was sent with actual price + 0.5% premium (issue #151), not 0.0
+        # Verify BUY limit order uses +0.2% premium (issue #211)
         mock_overseas_broker_with_buy_scenario.send_overseas_order.assert_called_once()
         call_kwargs = mock_overseas_broker_with_buy_scenario.send_overseas_order.call_args
         sent_price = call_kwargs[1].get("price") or call_kwargs[0][4]
-        expected_price = round(182.5 * 1.005, 4)  # 0.5% premium for BUY limit orders
+        expected_price = round(182.5 * 1.002, 4)  # 0.2% premium for BUY limit orders
         assert sent_price == expected_price, (
-            f"Expected limit price {expected_price} (182.5 * 1.005) but got {sent_price}. "
+            f"Expected limit price {expected_price} (182.5 * 1.002) but got {sent_price}. "
-            "KIS VTS only accepts limit orders; BUY uses 0.5% premium to improve fill rate."
+            "BUY uses +0.2% to improve fill rate while minimising overpayment (#211)."
+        )
+
+    @pytest.mark.asyncio
+    async def test_overseas_sell_order_uses_limit_price_below_current(
+        self,
+        mock_domestic_broker: MagicMock,
+        mock_playbook: DayPlaybook,
+        mock_risk: MagicMock,
+        mock_db: MagicMock,
+        mock_decision_logger: MagicMock,
+        mock_context_store: MagicMock,
+        mock_criticality_assessor: MagicMock,
+        mock_telegram: MagicMock,
+        mock_overseas_market: MagicMock,
+    ) -> None:
+        """Overseas SELL order must use current_price -0.2% limit (#211).
+
+        Placing SELL at exact last price risks no-fill when the bid is just below.
+        Using -0.2% ensures the order fills even if the price dips slightly.
+        """
+        sell_price = 182.5
+
+        # Broker mock: returns price data and a balance with 5 AAPL shares held.
+        overseas_broker = MagicMock()
+        overseas_broker.get_overseas_price = AsyncMock(
+            return_value={"output": {"last": str(sell_price), "rate": "1.5", "tvol": "5000000"}}
+        )
+        overseas_broker.get_overseas_balance = AsyncMock(
+            return_value={
+                "output1": [
+                    {
+                        "ovrs_pdno": "AAPL",
+                        "ovrs_cblc_qty": "5",
+                        "pchs_avg_pric": "170.0",
+                        "evlu_pfls_rt": "7.35",
+                    }
+                ],
+                "output2": [
+                    {
+                        "frcr_evlu_tota": "100000.00",
+                        "frcr_dncl_amt_2": "50000.00",
+                        "frcr_buy_amt_smtl": "50000.00",
+                    }
+                ],
+            }
+        )
+        overseas_broker.send_overseas_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+
+        sell_engine = MagicMock(spec=ScenarioEngine)
+        sell_engine.evaluate = MagicMock(return_value=_make_sell_match("AAPL"))
+        mock_telegram.notify_trade_execution = AsyncMock()
+
+        with patch("src.main.log_trade"), patch("src.main.get_open_position") as mock_pos:
+            mock_pos.return_value = {"quantity": 5, "stock_code": "AAPL", "price": 170.0}
+            await trading_cycle(
+                broker=mock_domestic_broker,
+                overseas_broker=overseas_broker,
+                scenario_engine=sell_engine,
+                playbook=mock_playbook,
+                risk=mock_risk,
+                db_conn=mock_db,
+                decision_logger=mock_decision_logger,
+                context_store=mock_context_store,
+                criticality_assessor=mock_criticality_assessor,
+                telegram=mock_telegram,
+                market=mock_overseas_market,
+                stock_code="AAPL",
+                scan_candidates={},
+            )
+
+        overseas_broker.send_overseas_order.assert_called_once()
+        call_kwargs = overseas_broker.send_overseas_order.call_args
+        sent_price = call_kwargs[1].get("price") or call_kwargs[0][4]
+        expected_price = round(sell_price * 0.998, 4)  # -0.2% for SELL limit orders
+        assert sent_price == expected_price, (
+            f"Expected SELL limit price {expected_price} (182.5 * 0.998) but got {sent_price}. "
+            "SELL uses -0.2% to ensure fill even when price dips slightly (#211)."
         )
 
 
@@ -3792,3 +3874,507 @@ class TestDomesticBuyDoublePreventionTradingCycle:
 
         # BUY must NOT have been executed because broker still holds the stock
         broker.send_order.assert_not_called()
+
+
+class TestHandleOverseasPendingOrders:
+    """Tests for handle_overseas_pending_orders function."""
+
+    def _make_settings(self, markets: str = "US_NASDAQ,US_NYSE,US_AMEX") -> Settings:
+        return Settings(
+            KIS_APP_KEY="k",
+            KIS_APP_SECRET="s",
+            KIS_ACCOUNT_NO="12345678-01",
+            GEMINI_API_KEY="g",
+            ENABLED_MARKETS=markets,
+        )
+
+    def _make_telegram(self) -> MagicMock:
+        t = MagicMock()
+        t.notify_unfilled_order = AsyncMock()
+        return t
+
+    @pytest.mark.asyncio
+    async def test_buy_pending_is_cancelled_and_cooldown_set(self) -> None:
+        """BUY pending order should be cancelled and buy_cooldown should be set."""
+        settings = self._make_settings("US_NASDAQ")
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "AAPL",
+            "odno": "ORD001",
+            "sll_buy_dvsn_cd": "02",  # BUY
+            "nccs_qty": "3",
+            "ovrs_excg_cd": "NASD",
+        }
+        overseas_broker = MagicMock()
+        overseas_broker.get_overseas_pending_orders = AsyncMock(
+            return_value=[pending_order]
+        )
+        overseas_broker.cancel_overseas_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+
+        sell_resubmit_counts: dict[str, int] = {}
+        buy_cooldown: dict[str, float] = {}
+
+        await handle_overseas_pending_orders(
+            overseas_broker, telegram, settings, sell_resubmit_counts, buy_cooldown
+        )
+
+        overseas_broker.cancel_overseas_order.assert_called_once_with(
+            exchange_code="NASD",
+            stock_code="AAPL",
+            odno="ORD001",
+            qty=3,
+        )
+        assert "NASD:AAPL" in buy_cooldown
+        telegram.notify_unfilled_order.assert_called_once()
+        call_kwargs = telegram.notify_unfilled_order.call_args[1]
+        assert call_kwargs["action"] == "BUY"
+        assert call_kwargs["outcome"] == "cancelled"
+
+    @pytest.mark.asyncio
+    async def test_sell_pending_is_cancelled_then_resubmitted(self) -> None:
+        """First unfilled SELL should be cancelled then resubmitted at -0.4% price."""
+        settings = self._make_settings("US_NASDAQ")
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "AAPL",
+            "odno": "ORD002",
+            "sll_buy_dvsn_cd": "01",  # SELL
+            "nccs_qty": "5",
+            "ovrs_excg_cd": "NASD",
+        }
+        overseas_broker = MagicMock()
+        overseas_broker.get_overseas_pending_orders = AsyncMock(
+            return_value=[pending_order]
+        )
+        overseas_broker.cancel_overseas_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+        overseas_broker.get_overseas_price = AsyncMock(
+            return_value={"output": {"last": "200.0"}}
+        )
+        overseas_broker.send_overseas_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+
+        sell_resubmit_counts: dict[str, int] = {}
+
+        await handle_overseas_pending_orders(
+            overseas_broker, telegram, settings, sell_resubmit_counts
+        )
+
+        overseas_broker.cancel_overseas_order.assert_called_once()
+        overseas_broker.send_overseas_order.assert_called_once()
+        resubmit_kwargs = overseas_broker.send_overseas_order.call_args[1]
+        assert resubmit_kwargs["order_type"] == "SELL"
+        assert resubmit_kwargs["price"] == round(200.0 * 0.996, 4)
+        assert sell_resubmit_counts.get("NASD:AAPL") == 1
+        notify_kwargs = telegram.notify_unfilled_order.call_args[1]
+        assert notify_kwargs["outcome"] == "resubmitted"
+
+    @pytest.mark.asyncio
+    async def test_sell_cancel_failure_skips_resubmit(self) -> None:
+        """When cancel returns rt_cd != '0', resubmit should NOT be attempted."""
+        settings = self._make_settings("US_NASDAQ")
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "AAPL",
+            "odno": "ORD003",
+            "sll_buy_dvsn_cd": "01",  # SELL
+            "nccs_qty": "2",
+            "ovrs_excg_cd": "NASD",
+        }
+        overseas_broker = MagicMock()
+        overseas_broker.get_overseas_pending_orders = AsyncMock(
+            return_value=[pending_order]
+        )
+        overseas_broker.cancel_overseas_order = AsyncMock(
+            return_value={"rt_cd": "1", "msg1": "Error"}  # failure
+        )
+        overseas_broker.send_overseas_order = AsyncMock()
+
+        sell_resubmit_counts: dict[str, int] = {}
+
+        await handle_overseas_pending_orders(
+            overseas_broker, telegram, settings, sell_resubmit_counts
+        )
+
+        overseas_broker.send_overseas_order.assert_not_called()
+        telegram.notify_unfilled_order.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_sell_already_resubmitted_is_only_cancelled(self) -> None:
+        """Second unfilled SELL (sell_resubmit_counts >= 1) should only cancel, no resubmit."""
+        settings = self._make_settings("US_NASDAQ")
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "AAPL",
+            "odno": "ORD004",
+            "sll_buy_dvsn_cd": "01",  # SELL
+            "nccs_qty": "4",
+            "ovrs_excg_cd": "NASD",
+        }
+        overseas_broker = MagicMock()
+        overseas_broker.get_overseas_pending_orders = AsyncMock(
+            return_value=[pending_order]
+        )
+        overseas_broker.cancel_overseas_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+        overseas_broker.send_overseas_order = AsyncMock()
+
+        # Already resubmitted once
+        sell_resubmit_counts: dict[str, int] = {"NASD:AAPL": 1}
+
+        await handle_overseas_pending_orders(
+            overseas_broker, telegram, settings, sell_resubmit_counts
+        )
+
+        overseas_broker.cancel_overseas_order.assert_called_once()
+        overseas_broker.send_overseas_order.assert_not_called()
+        notify_kwargs = telegram.notify_unfilled_order.call_args[1]
+        assert notify_kwargs["outcome"] == "cancelled"
+        assert notify_kwargs["action"] == "SELL"
+
+    @pytest.mark.asyncio
+    async def test_us_exchanges_deduplicated_to_nasd(self) -> None:
+        """US_NASDAQ, US_NYSE, US_AMEX should result in only one NASD query."""
+        settings = self._make_settings("US_NASDAQ,US_NYSE,US_AMEX")
+        telegram = self._make_telegram()
+
+        overseas_broker = MagicMock()
+        overseas_broker.get_overseas_pending_orders = AsyncMock(return_value=[])
+
+        sell_resubmit_counts: dict[str, int] = {}
+
+        await handle_overseas_pending_orders(
+            overseas_broker, telegram, settings, sell_resubmit_counts
+        )
+
+        # Should be called exactly once with "NASD"
+        assert overseas_broker.get_overseas_pending_orders.call_count == 1
+        overseas_broker.get_overseas_pending_orders.assert_called_once_with("NASD")
+
+
+# ---------------------------------------------------------------------------
+# Domestic Pending Order Handling
+# ---------------------------------------------------------------------------
+
+
+class TestHandleDomesticPendingOrders:
+    """Tests for handle_domestic_pending_orders function."""
+
+    def _make_settings(self) -> Settings:
+        return Settings(
+            KIS_APP_KEY="k",
+            KIS_APP_SECRET="s",
+            KIS_ACCOUNT_NO="12345678-01",
+            GEMINI_API_KEY="g",
+            ENABLED_MARKETS="KR",
+        )
+
+    def _make_telegram(self) -> MagicMock:
+        t = MagicMock()
+        t.notify_unfilled_order = AsyncMock()
+        return t
+
+    @pytest.mark.asyncio
+    async def test_buy_pending_is_cancelled_and_cooldown_set(self) -> None:
+        """BUY pending order should be cancelled and buy_cooldown should be set."""
+        settings = self._make_settings()
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "005930",
+            "orgn_odno": "ORD001",
+            "ord_gno_brno": "BRN01",
+            "sll_buy_dvsn_cd": "02",  # BUY
+            "psbl_qty": "3",
+        }
+        broker = MagicMock()
+        broker.get_domestic_pending_orders = AsyncMock(return_value=[pending_order])
+        broker.cancel_domestic_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+
+        sell_resubmit_counts: dict[str, int] = {}
+        buy_cooldown: dict[str, float] = {}
+
+        await handle_domestic_pending_orders(
+            broker, telegram, settings, sell_resubmit_counts, buy_cooldown
+        )
+
+        broker.cancel_domestic_order.assert_called_once_with(
+            stock_code="005930",
+            orgn_odno="ORD001",
+            krx_fwdg_ord_orgno="BRN01",
+            qty=3,
+        )
+        assert "KR:005930" in buy_cooldown
+        telegram.notify_unfilled_order.assert_called_once()
+        call_kwargs = telegram.notify_unfilled_order.call_args[1]
+        assert call_kwargs["action"] == "BUY"
+        assert call_kwargs["outcome"] == "cancelled"
+        assert call_kwargs["market"] == "KR"
+
+    @pytest.mark.asyncio
+    async def test_sell_pending_is_cancelled_then_resubmitted(self) -> None:
+        """First unfilled SELL should be cancelled then resubmitted at -0.4% price."""
+        from src.broker.kis_api import kr_round_down
+
+        settings = self._make_settings()
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "005930",
+            "orgn_odno": "ORD002",
+            "ord_gno_brno": "BRN02",
+            "sll_buy_dvsn_cd": "01",  # SELL
+            "psbl_qty": "5",
+        }
+        broker = MagicMock()
+        broker.get_domestic_pending_orders = AsyncMock(return_value=[pending_order])
+        broker.cancel_domestic_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+        broker.get_current_price = AsyncMock(return_value=(50000.0, 0.0, 0.0))
+        broker.send_order = AsyncMock(return_value={"rt_cd": "0"})
+
+        sell_resubmit_counts: dict[str, int] = {}
+
+        await handle_domestic_pending_orders(
+            broker, telegram, settings, sell_resubmit_counts
+        )
+
+        broker.cancel_domestic_order.assert_called_once()
+        broker.send_order.assert_called_once()
+        resubmit_kwargs = broker.send_order.call_args[1]
+        assert resubmit_kwargs["order_type"] == "SELL"
+        expected_price = kr_round_down(50000.0 * 0.996)
+        assert resubmit_kwargs["price"] == expected_price
+        assert sell_resubmit_counts.get("KR:005930") == 1
+        notify_kwargs = telegram.notify_unfilled_order.call_args[1]
+        assert notify_kwargs["outcome"] == "resubmitted"
+
+    @pytest.mark.asyncio
+    async def test_sell_cancel_failure_skips_resubmit(self) -> None:
+        """When cancel returns rt_cd != '0', resubmit should NOT be attempted."""
+        settings = self._make_settings()
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "005930",
+            "orgn_odno": "ORD003",
+            "ord_gno_brno": "BRN03",
+            "sll_buy_dvsn_cd": "01",  # SELL
+            "psbl_qty": "2",
+        }
+        broker = MagicMock()
+        broker.get_domestic_pending_orders = AsyncMock(return_value=[pending_order])
+        broker.cancel_domestic_order = AsyncMock(
+            return_value={"rt_cd": "1", "msg1": "Error"}  # failure
+        )
+        broker.send_order = AsyncMock()
+
+        sell_resubmit_counts: dict[str, int] = {}
+
+        await handle_domestic_pending_orders(
+            broker, telegram, settings, sell_resubmit_counts
+        )
+
+        broker.send_order.assert_not_called()
+        telegram.notify_unfilled_order.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_sell_already_resubmitted_is_only_cancelled(self) -> None:
+        """Second unfilled SELL (sell_resubmit_counts >= 1) should only cancel, no resubmit."""
+        settings = self._make_settings()
+        telegram = self._make_telegram()
+
+        pending_order = {
+            "pdno": "005930",
+            "orgn_odno": "ORD004",
+            "ord_gno_brno": "BRN04",
+            "sll_buy_dvsn_cd": "01",  # SELL
+            "psbl_qty": "4",
+        }
+        broker = MagicMock()
+        broker.get_domestic_pending_orders = AsyncMock(return_value=[pending_order])
+        broker.cancel_domestic_order = AsyncMock(
+            return_value={"rt_cd": "0", "msg1": "OK"}
+        )
+        broker.send_order = AsyncMock()
+
+        # Already resubmitted once
+        sell_resubmit_counts: dict[str, int] = {"KR:005930": 1}
+
+        await handle_domestic_pending_orders(
+            broker, telegram, settings, sell_resubmit_counts
+        )
+
+        broker.cancel_domestic_order.assert_called_once()
+        broker.send_order.assert_not_called()
+        notify_kwargs = telegram.notify_unfilled_order.call_args[1]
+        assert notify_kwargs["outcome"] == "cancelled"
+        assert notify_kwargs["action"] == "SELL"
+
+
+# ---------------------------------------------------------------------------
+# Domestic Limit Order Price in trading_cycle
+# ---------------------------------------------------------------------------
+
+
+class TestDomesticLimitOrderPrice:
+    """trading_cycle must use kr_round_down limit prices for domestic orders."""
+
+    def _make_market(self) -> MagicMock:
+        market = MagicMock()
+        market.name = "Korea"
+        market.code = "KR"
+        market.exchange_code = "KRX"
+        market.is_domestic = True
+        return market
+
+    def _make_broker(self, current_price: float, balance_data: dict) -> MagicMock:
+        broker = MagicMock()
+        broker.get_current_price = AsyncMock(return_value=(current_price, 0.0, 0.0))
+        broker.get_balance = AsyncMock(return_value=balance_data)
+        broker.send_order = AsyncMock(return_value={"rt_cd": "0", "msg1": "OK"})
+        return broker
+
+    @pytest.mark.asyncio
+    async def test_trading_cycle_domestic_buy_uses_limit_price(self) -> None:
+        """BUY order for domestic stock must use kr_round_down(price * 1.002)."""
+        from src.broker.kis_api import kr_round_down
+        from src.strategy.models import ScenarioAction
+
+        current_price = 70000.0
+        balance_data = {
+            "output2": [
+                {
+                    "tot_evlu_amt": "10000000",
+                    "dnca_tot_amt": "5000000",
+                    "pchs_amt_smtl_amt": "5000000",
+                }
+            ]
+        }
+        broker = self._make_broker(current_price, balance_data)
+        market = self._make_market()
+
+        buy_match = ScenarioMatch(
+            stock_code="005930",
+            matched_scenario=None,
+            action=ScenarioAction.BUY,
+            confidence=85,
+            rationale="test",
+        )
+        engine = MagicMock(spec=ScenarioEngine)
+        engine.evaluate = MagicMock(return_value=buy_match)
+
+        risk = MagicMock()
+        risk.validate_order = MagicMock()
+        risk.check_circuit_breaker = MagicMock()
+        telegram = MagicMock()
+        telegram.notify_trade_execution = AsyncMock()
+        telegram.notify_fat_finger = AsyncMock()
+        telegram.notify_circuit_breaker = AsyncMock()
+        telegram.notify_scenario_matched = AsyncMock()
+
+        with patch("src.main.log_trade"):
+            await trading_cycle(
+                broker=broker,
+                overseas_broker=MagicMock(),
+                scenario_engine=engine,
+                playbook=_make_playbook(),
+                risk=risk,
+                db_conn=MagicMock(),
+                decision_logger=MagicMock(),
+                context_store=MagicMock(get_latest_timeframe=MagicMock(return_value=None)),
+                criticality_assessor=MagicMock(
+                    assess_market_conditions=MagicMock(return_value=MagicMock(value="NORMAL")),
+                    get_timeout=MagicMock(return_value=5.0),
+                ),
+                telegram=telegram,
+                market=market,
+                stock_code="005930",
+                scan_candidates={},
+            )
+
+        broker.send_order.assert_called_once()
+        call_kwargs = broker.send_order.call_args[1]
+        expected_price = kr_round_down(current_price * 1.002)
+        assert call_kwargs["price"] == expected_price
+        assert call_kwargs["order_type"] == "BUY"
+
+    @pytest.mark.asyncio
+    async def test_trading_cycle_domestic_sell_uses_limit_price(self) -> None:
+        """SELL order for domestic stock must use kr_round_down(price * 0.998)."""
+        from src.broker.kis_api import kr_round_down
+        from src.strategy.models import ScenarioAction
+
+        current_price = 70000.0
+        stock_code = "005930"
+        balance_data = {
+            "output1": [
+                {"pdno": stock_code, "hldg_qty": "5", "prpr": "70000", "evlu_amt": "350000"}
+            ],
+            "output2": [
+                {
+                    "tot_evlu_amt": "350000",
+                    "dnca_tot_amt": "0",
+                    "pchs_amt_smtl_amt": "350000",
+                }
+            ],
+        }
+        broker = self._make_broker(current_price, balance_data)
+        market = self._make_market()
+
+        sell_match = ScenarioMatch(
+            stock_code=stock_code,
+            matched_scenario=None,
+            action=ScenarioAction.SELL,
+            confidence=85,
+            rationale="test",
+        )
+        engine = MagicMock(spec=ScenarioEngine)
+        engine.evaluate = MagicMock(return_value=sell_match)
+
+        risk = MagicMock()
+        risk.validate_order = MagicMock()
+        risk.check_circuit_breaker = MagicMock()
+        telegram = MagicMock()
+        telegram.notify_trade_execution = AsyncMock()
+        telegram.notify_fat_finger = AsyncMock()
+        telegram.notify_circuit_breaker = AsyncMock()
+        telegram.notify_scenario_matched = AsyncMock()
+
+        with patch("src.main.log_trade"):
+            await trading_cycle(
+                broker=broker,
+                overseas_broker=MagicMock(),
+                scenario_engine=engine,
+                playbook=_make_playbook(),
+                risk=risk,
+                db_conn=MagicMock(),
+                decision_logger=MagicMock(),
+                context_store=MagicMock(get_latest_timeframe=MagicMock(return_value=None)),
+                criticality_assessor=MagicMock(
+                    assess_market_conditions=MagicMock(return_value=MagicMock(value="NORMAL")),
+                    get_timeout=MagicMock(return_value=5.0),
+                ),
+                telegram=telegram,
+                market=market,
+                stock_code=stock_code,
+                scan_candidates={},
+            )
+
+        broker.send_order.assert_called_once()
+        call_kwargs = broker.send_order.call_args[1]
+        expected_price = kr_round_down(current_price * 0.998)
+        assert call_kwargs["price"] == expected_price
+        assert call_kwargs["order_type"] == "SELL"

tests/test_overseas_broker.py

@@ -813,3 +813,221 @@ class TestOverseasTRIDBranching:
 
         await broker.send_overseas_order("NASD", "AAPL", "SELL", 1)
         assert "TTTT1006U" in captured
+
+
+class TestGetOverseasPendingOrders:
+    """Tests for get_overseas_pending_orders method."""
+
+    @pytest.mark.asyncio
+    async def test_paper_mode_returns_empty(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """Paper mode should immediately return [] without any API call."""
+        # Default mock_settings has MODE="paper"
+        overseas_broker._broker._settings = overseas_broker._broker._settings.model_copy(
+            update={"MODE": "paper"}
+        )
+        mock_session = MagicMock()
+        _setup_broker_mocks(overseas_broker, mock_session)
+
+        result = await overseas_broker.get_overseas_pending_orders("NASD")
+
+        assert result == []
+        mock_session.get.assert_not_called()
+
+    @pytest.mark.asyncio
+    async def test_live_mode_calls_ttts3018r_with_correct_params(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """Live mode should call TTTS3018R with OVRS_EXCG_CD and return output list."""
+        overseas_broker._broker._settings = overseas_broker._broker._settings.model_copy(
+            update={"MODE": "live"}
+        )
+        captured_tr_id: list[str] = []
+        captured_params: list[dict] = []
+
+        async def mock_auth_headers(tr_id: str) -> dict:
+            captured_tr_id.append(tr_id)
+            return {}
+
+        overseas_broker._broker._auth_headers = mock_auth_headers  # type: ignore[method-assign]
+
+        pending_orders = [
+            {"odno": "001", "pdno": "AAPL", "sll_buy_dvsn_cd": "02", "nccs_qty": "5"}
+        ]
+        mock_resp = AsyncMock()
+        mock_resp.status = 200
+        mock_resp.json = AsyncMock(return_value={"output": pending_orders})
+
+        mock_session = MagicMock()
+
+        def _capture_get(url: str, **kwargs: object) -> MagicMock:
+            captured_params.append(kwargs.get("params", {}))
+            return _make_async_cm(mock_resp)
+
+        mock_session.get = MagicMock(side_effect=_capture_get)
+        overseas_broker._broker._rate_limiter.acquire = AsyncMock()
+        overseas_broker._broker._get_session = MagicMock(return_value=mock_session)
+
+        result = await overseas_broker.get_overseas_pending_orders("NASD")
+
+        assert result == pending_orders
+        assert captured_tr_id == ["TTTS3018R"]
+        assert captured_params[0]["OVRS_EXCG_CD"] == "NASD"
+
+    @pytest.mark.asyncio
+    async def test_live_mode_connection_error(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """Network error in live mode should raise ConnectionError."""
+        overseas_broker._broker._settings = overseas_broker._broker._settings.model_copy(
+            update={"MODE": "live"}
+        )
+        cm = MagicMock()
+        cm.__aenter__ = AsyncMock(side_effect=aiohttp.ClientError("timeout"))
+        cm.__aexit__ = AsyncMock(return_value=False)
+
+        mock_session = MagicMock()
+        mock_session.get = MagicMock(return_value=cm)
+        _setup_broker_mocks(overseas_broker, mock_session)
+
+        with pytest.raises(ConnectionError, match="Network error fetching pending orders"):
+            await overseas_broker.get_overseas_pending_orders("NASD")
+
+
+class TestCancelOverseasOrder:
+    """Tests for cancel_overseas_order method."""
+
+    def _setup_cancel_mocks(
+        self, overseas_broker: OverseasBroker, response: dict
+    ) -> tuple[list[str], MagicMock]:
+        """Wire up mocks for a successful cancel call; return captured TR_IDs and session."""
+        captured_tr_ids: list[str] = []
+
+        async def mock_auth_headers(tr_id: str) -> dict:
+            captured_tr_ids.append(tr_id)
+            return {}
+
+        overseas_broker._broker._auth_headers = mock_auth_headers  # type: ignore[method-assign]
+        overseas_broker._broker._get_hash_key = AsyncMock(return_value="hash_val")  # type: ignore[method-assign]
+        overseas_broker._broker._rate_limiter.acquire = AsyncMock()
+
+        mock_resp = AsyncMock()
+        mock_resp.status = 200
+        mock_resp.json = AsyncMock(return_value=response)
+
+        mock_session = MagicMock()
+        mock_session.post = MagicMock(return_value=_make_async_cm(mock_resp))
+        overseas_broker._broker._get_session = MagicMock(return_value=mock_session)
+
+        return captured_tr_ids, mock_session
+
+    @pytest.mark.asyncio
+    async def test_us_live_uses_tttt1004u(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """US exchange in live mode should use TTTT1004U."""
+        overseas_broker._broker._settings = overseas_broker._broker._settings.model_copy(
+            update={"MODE": "live"}
+        )
+        captured, _ = self._setup_cancel_mocks(
+            overseas_broker, {"rt_cd": "0", "msg1": "OK"}
+        )
+
+        await overseas_broker.cancel_overseas_order("NASD", "AAPL", "ORD001", 5)
+
+        assert "TTTT1004U" in captured
+
+    @pytest.mark.asyncio
+    async def test_us_paper_uses_vttt1004u(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """US exchange in paper mode should use VTTT1004U."""
+        # Default mock_settings has MODE="paper"
+        captured, _ = self._setup_cancel_mocks(
+            overseas_broker, {"rt_cd": "0", "msg1": "OK"}
+        )
+
+        await overseas_broker.cancel_overseas_order("NASD", "AAPL", "ORD001", 5)
+
+        assert "VTTT1004U" in captured
+
+    @pytest.mark.asyncio
+    async def test_hk_live_uses_ttts1003u(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """SEHK exchange in live mode should use TTTS1003U."""
+        overseas_broker._broker._settings = overseas_broker._broker._settings.model_copy(
+            update={"MODE": "live"}
+        )
+        captured, _ = self._setup_cancel_mocks(
+            overseas_broker, {"rt_cd": "0", "msg1": "OK"}
+        )
+
+        await overseas_broker.cancel_overseas_order("SEHK", "0700", "ORD002", 10)
+
+        assert "TTTS1003U" in captured
+
+    @pytest.mark.asyncio
+    async def test_cancel_sets_rvse_cncl_dvsn_cd_02(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """Cancel body must include RVSE_CNCL_DVSN_CD='02' and OVRS_ORD_UNPR='0'."""
+        captured_body: list[dict] = []
+
+        async def mock_auth_headers(tr_id: str) -> dict:
+            return {}
+
+        overseas_broker._broker._auth_headers = mock_auth_headers  # type: ignore[method-assign]
+        overseas_broker._broker._get_hash_key = AsyncMock(return_value="h")  # type: ignore[method-assign]
+        overseas_broker._broker._rate_limiter.acquire = AsyncMock()
+
+        mock_resp = AsyncMock()
+        mock_resp.status = 200
+        mock_resp.json = AsyncMock(return_value={"rt_cd": "0"})
+
+        mock_session = MagicMock()
+
+        def _capture_post(url: str, **kwargs: object) -> MagicMock:
+            captured_body.append(kwargs.get("json", {}))
+            return _make_async_cm(mock_resp)
+
+        mock_session.post = MagicMock(side_effect=_capture_post)
+        overseas_broker._broker._get_session = MagicMock(return_value=mock_session)
+
+        await overseas_broker.cancel_overseas_order("NASD", "AAPL", "ORD003", 3)
+
+        assert captured_body[0]["RVSE_CNCL_DVSN_CD"] == "02"
+        assert captured_body[0]["OVRS_ORD_UNPR"] == "0"
+        assert captured_body[0]["ORGN_ODNO"] == "ORD003"
+
+    @pytest.mark.asyncio
+    async def test_cancel_sets_hashkey_header(
+        self, overseas_broker: OverseasBroker
+    ) -> None:
+        """hashkey must be set in the request headers."""
+        captured_headers: list[dict] = []
+        overseas_broker._broker._get_hash_key = AsyncMock(return_value="test_hash")  # type: ignore[method-assign]
+        overseas_broker._broker._rate_limiter.acquire = AsyncMock()
+
+        async def mock_auth_headers(tr_id: str) -> dict:
+            return {"tr_id": tr_id}
+
+        overseas_broker._broker._auth_headers = mock_auth_headers  # type: ignore[method-assign]
+
+        mock_resp = AsyncMock()
+        mock_resp.status = 200
+        mock_resp.json = AsyncMock(return_value={"rt_cd": "0"})
+
+        mock_session = MagicMock()
+
+        def _capture_post(url: str, **kwargs: object) -> MagicMock:
+            captured_headers.append(dict(kwargs.get("headers", {})))
+            return _make_async_cm(mock_resp)
+
+        mock_session.post = MagicMock(side_effect=_capture_post)
+        overseas_broker._broker._get_session = MagicMock(return_value=mock_session)
+
+        await overseas_broker.cancel_overseas_order("NASD", "AAPL", "ORD004", 2)
+
+        assert captured_headers[0].get("hashkey") == "test_hash"