diff --git a/backend_api_python/app/services/live_trading/spot_sizing.py b/backend_api_python/app/services/live_trading/spot_sizing.py
index ca2b075c1..861445cd8 100644
--- a/backend_api_python/app/services/live_trading/spot_sizing.py
+++ b/backend_api_python/app/services/live_trading/spot_sizing.py
@@ -245,13 +245,30 @@ def get_spot_base_holding(
         if isinstance(client, HtxClient) and getattr(client, "market_type", "") == "spot":
             balance = client.get_balance()
             items = (((balance.get("data") or {}).get("list")) if isinstance(balance, dict) else None) or []
+            # HTX splits one currency over several rows: ``trade`` is the
+            # sellable part, ``frozen`` is locked by resting orders and still
+            # owned.  Order is not guaranteed, so accumulate instead of
+            # returning on the first row that matches the base asset.
+            tradable = 0.0
+            frozen = 0.0
+            avail = 0.0
+            matched = False
             for item in items:
                 if not isinstance(item, dict):
                     continue
-                if str(item.get("currency") or "").upper() == base_u:
-                    total = _pick_free_from_row(item, "balance")
-                    avail = _pick_free_from_row(item, "available", "balance")
-                    return _spot_holding(total, avail)
+                if str(item.get("currency") or "").upper() != base_u:
+                    continue
+                balance_type = str(item.get("type") or "").strip().lower()
+                if balance_type == "frozen":
+                    matched = True
+                    frozen += _pick_free_from_row(item, "balance")
+                elif balance_type == "trade":
+                    matched = True
+                    tradable += _pick_free_from_row(item, "balance")
+                    avail += _pick_free_from_row(item, "available", "balance")
+                # Other balance types are not part of this spot trading inventory.
+            if matched:
+                return _spot_holding(tradable + frozen, avail)
     except Exception as e:
         if strict:
             raise
diff --git a/backend_api_python/tests/test_spot_sizing.py b/backend_api_python/tests/test_spot_sizing.py
index d78a15df8..c7fa244b9 100644
--- a/backend_api_python/tests/test_spot_sizing.py
+++ b/backend_api_python/tests/test_spot_sizing.py
@@ -1,8 +1,11 @@
 from decimal import Decimal
 from unittest.mock import MagicMock
 
+import pytest
+
 from app.services.live_trading.binance_spot import BinanceSpotClient
 from app.services.live_trading.bitget_spot import BitgetSpotClient
+from app.services.live_trading.htx import HtxClient
 from app.services.live_trading.spot_sizing import (
     clamp_spot_close_quantity,
     get_spot_free_base_balance,
@@ -72,3 +75,74 @@ def test_clamp_spot_close_no_change_when_within_free():
     final, meta = clamp_spot_close_quantity(client, symbol="ETH/USDT", requested_qty=0.5, safety_ratio=1.0)
     assert final == 0.5
     assert "adjusted" not in meta or meta.get("adjusted") is not True
+
+
+def test_htx_spot_ownership_includes_frozen_rows():
+    """HTX returns one row per (currency, type); ``frozen`` is still owned."""
+    client = MagicMock(spec=HtxClient)
+    client.market_type = "spot"
+    client.get_balance.return_value = {
+        "data": {
+            "list": [
+                {"currency": "btc", "type": "trade", "balance": "0.6", "available": "0.6"},
+                {"currency": "btc", "type": "frozen", "balance": "0.4"},
+                {"currency": "usdt", "type": "trade", "balance": "1200"},
+            ]
+        }
+    }
+
+    assert get_spot_total_base_balance(client, symbol="BTC/USDT") == 1.0
+    assert get_spot_free_base_balance(client, symbol="BTC/USDT") == 0.6
+
+
+def test_htx_spot_frozen_row_first_is_not_taken_for_the_whole_holding():
+    """The API does not guarantee ``trade`` comes before ``frozen``."""
+    client = MagicMock(spec=HtxClient)
+    client.market_type = "spot"
+    client.get_balance.return_value = {
+        "data": {
+            "list": [
+                {"currency": "eth", "type": "frozen", "balance": "2"},
+                {"currency": "eth", "type": "trade", "balance": "3", "available": "3"},
+            ]
+        }
+    }
+
+    assert get_spot_total_base_balance(client, symbol="ETH/USDT") == 5.0
+    assert get_spot_free_base_balance(client, symbol="ETH/USDT") == 3.0
+
+
+@pytest.mark.parametrize("balance_type", ["lock", "bank", "loan", "interest", "unknown", "", None])
+@pytest.mark.parametrize("extra_first", [False, True])
+def test_htx_spot_non_trading_rows_do_not_increase_sellable_inventory(balance_type, extra_first):
+    client = MagicMock(spec=HtxClient)
+    client.market_type = "spot"
+    rows = [
+        {"currency": "btc", "type": "trade", "balance": "0.6"},
+        {"currency": "btc", "type": "frozen", "balance": "0.4"},
+    ]
+    extra = {"currency": "btc", "balance": "2", "available": "2"}
+    if balance_type is not None:
+        extra["type"] = balance_type
+    rows.insert(0 if extra_first else len(rows), extra)
+    client.get_balance.return_value = {"data": {"list": rows}}
+
+    assert get_spot_total_base_balance(client, symbol="BTC/USDT") == 1.0
+    assert get_spot_free_base_balance(client, symbol="BTC/USDT") == 0.6
+    quantity, meta = clamp_spot_close_quantity(
+        client, symbol="BTC/USDT", requested_qty=3.0, safety_ratio=1.0,
+    )
+    assert quantity == 0.6
+    assert meta["exchange_free"] == 0.6
+
+
+def test_htx_spot_fully_frozen_inventory_has_zero_available():
+    client = MagicMock(spec=HtxClient)
+    client.market_type = "spot"
+    client.get_balance.return_value = {"data": {"list": [
+        {"currency": "btc", "type": " FROZEN ", "balance": "1", "available": "1"},
+        {"currency": "btc", "type": " TRADE ", "balance": "0"},
+    ]}}
+
+    assert get_spot_total_base_balance(client, symbol="BTC/USDT") == 1.0
+    assert get_spot_free_base_balance(client, symbol="BTC/USDT") == 0.0