diff --git a/src/data_collection/polymarket_ws_cache.py b/src/data_collection/polymarket_ws_cache.py
index 25b66d7d..8f5babcb 100644
--- a/src/data_collection/polymarket_ws_cache.py
+++ b/src/data_collection/polymarket_ws_cache.py
@@ -262,14 +262,11 @@ class PolymarketWsQuoteCache:
         batch = [asset_id for asset_id in asset_ids if asset_id]
         if not batch:
             return
-        payload = {
+        payload: Dict[str, Any] = {
+            "type": "subscribe",
+            "channel": "market",
             "assets_ids": batch,
-            "custom_feature_enabled": True,
         }
-        if initial:
-            payload["type"] = "market"
-        else:
-            payload["operation"] = "subscribe"
         await ws.send(json.dumps(payload))
 
     def _handle_message(self, raw: Any) -> None:
diff --git a/tests/test_polymarket_ws_cache.py b/tests/test_polymarket_ws_cache.py
index bacddcb1..a08aadb3 100644
--- a/tests/test_polymarket_ws_cache.py
+++ b/tests/test_polymarket_ws_cache.py
@@ -113,12 +113,12 @@ def test_ws_cache_subscription_payloads_match_market_channel_shape():
     asyncio.run(cache._send_subscription(ws, ["asset-2"], initial=False))
 
     assert ws.messages[0] == {
-        "type": "market",
+        "type": "subscribe",
+        "channel": "market",
         "assets_ids": ["asset-1"],
-        "custom_feature_enabled": True,
     }
     assert ws.messages[1] == {
-        "operation": "subscribe",
+        "type": "subscribe",
+        "channel": "market",
         "assets_ids": ["asset-2"],
-        "custom_feature_enabled": True,
     }