Add gateio price type field

freqtrade/exchange/gateio.py

@@ -4,7 +4,7 @@ from datetime import datetime
 from typing import Any, Dict, List, Optional, Tuple
 
 from freqtrade.constants import BuySell
-from freqtrade.enums import MarginMode, TradingMode
+from freqtrade.enums import MarginMode, PriceType, TradingMode
 from freqtrade.exceptions import OperationalException
 from freqtrade.exchange import Exchange
 from freqtrade.misc import safe_value_fallback2
@@ -34,6 +34,12 @@ class Gateio(Exchange):
         "needs_trading_fees": True,
         "fee_cost_in_contracts": False,  # Set explicitly to false for clarity
         "order_props_in_contracts": ['amount', 'filled', 'remaining'],
+        "stop_price_type_field": "price_type",
+        "stop_price_type_value_mapping": {
+            PriceType.LAST: 0,
+            PriceType.MARK: 1,
+            PriceType.INDEX: 2,
+        },
     }
 
     _supported_trading_mode_margin_pairs: List[Tuple[TradingMode, MarginMode]] = [

tests/exchange/test_exchange.py

@@ -1070,6 +1070,9 @@ def test_validate_ordertypes(default_conf, mocker):
     # ('okx', 'last', True),
     # ('okx', 'mark', True),
     # ('okx', 'index', True),
+    ('gate', 'last', True),
+    ('gate', 'mark', True),
+    ('gate', 'index', True),
     ])
 def test_validate_ordertypes_stop_advanced(default_conf, mocker, exchange_name, stopadv, expected):