diff --git a/tests/ws_integration_tests.rs b/tests/ws_integration_tests.rs
index a609eb3..aa3c405 100644
--- a/tests/ws_integration_tests.rs
+++ b/tests/ws_integration_tests.rs
@@ -9,10 +9,25 @@
 
 use futures::StreamExt;
 use polyfill_rs::{ClobClient, OrderBookManager, WebSocketStream, WsBookUpdateProcessor};
+use std::env;
 use std::time::Duration;
 
 const HOST: &str = "https://clob.polymarket.com";
 const WS_MARKET_URL: &str = "wss://ws-subscriptions-clob.polymarket.com/ws/market";
+const WS_USER_URL: &str = "wss://ws-subscriptions-clob.polymarket.com/ws/user";
+const CHAIN_ID: u64 = 137;
+
+fn load_private_key() -> String {
+    dotenvy::dotenv().ok();
+    env::var("POLYMARKET_PRIVATE_KEY").expect("POLYMARKET_PRIVATE_KEY must be set (env or .env)")
+}
+
+fn stability_secs(default_secs: u64) -> u64 {
+    env::var("POLYFILL_WS_STABILITY_SECS")
+        .ok()
+        .and_then(|v| v.parse::<u64>().ok())
+        .unwrap_or(default_secs)
+}
 
 #[tokio::test(flavor = "multi_thread")]
 #[ignore]
@@ -62,3 +77,107 @@ async fn test_real_ws_market_book_applier_receives_book_update() {
         "expected some book levels after applying an update"
     );
 }
+
+#[tokio::test(flavor = "multi_thread")]
+#[ignore]
+async fn test_real_ws_market_book_applier_connection_stable() {
+    // Subscribe to a handful of active tokens and keep the connection open for a while.
+    // We don't require constant message flow; we just fail on close or error.
+    let client = ClobClient::new(HOST);
+    let markets = client
+        .get_sampling_markets(None)
+        .await
+        .expect("failed to fetch markets");
+
+    let token_ids: Vec<String> = markets
+        .data
+        .iter()
+        .filter(|m| m.active && !m.closed)
+        .filter_map(|m| m.tokens.first().map(|t| t.token_id.clone()))
+        .take(10)
+        .collect();
+
+    assert!(!token_ids.is_empty(), "no active token IDs found");
+
+    let books = OrderBookManager::new(256);
+    for token_id in &token_ids {
+        books
+            .get_or_create_book(token_id)
+            .expect("failed to create book");
+    }
+
+    let mut ws = WebSocketStream::new(WS_MARKET_URL);
+    ws.subscribe_market_channel(token_ids.clone())
+        .await
+        .expect("failed to subscribe market channel");
+
+    let processor = WsBookUpdateProcessor::new(256 * 1024);
+    let mut applier = ws.into_book_applier(&books, processor);
+
+    let deadline = tokio::time::Instant::now() + Duration::from_secs(stability_secs(15));
+    let mut saw_book_message = false;
+
+    while tokio::time::Instant::now() < deadline {
+        match tokio::time::timeout(Duration::from_secs(1), applier.next()).await {
+            Ok(Some(Ok(stats))) => {
+                if stats.book_messages > 0 {
+                    saw_book_message = true;
+                }
+            },
+            Ok(Some(Err(e))) => panic!("WS processing error: {:?}", e),
+            Ok(None) => panic!("WS stream ended unexpectedly"),
+            Err(_) => {
+                // No message in this interval; keep waiting.
+            },
+        }
+    }
+
+    assert!(
+        saw_book_message,
+        "did not observe any `book` messages during stability window"
+    );
+}
+
+#[tokio::test(flavor = "multi_thread")]
+#[ignore]
+async fn test_real_ws_user_channel_connection_stable() {
+    // Connect + subscribe to the user channel and keep the connection open for a while.
+    //
+    // Note: depending on account activity, the WS may not emit any `order`/`trade` messages
+    // during the window. This test primarily asserts we can authenticate + subscribe
+    // and that the connection doesn't immediately drop.
+    let private_key = load_private_key();
+    let auth_client = ClobClient::with_l1_headers(HOST, &private_key, CHAIN_ID);
+    let api_creds = auth_client
+        .create_or_derive_api_key(None)
+        .await
+        .expect("failed to create/derive api key");
+
+    let markets = auth_client
+        .get_sampling_markets(None)
+        .await
+        .expect("failed to fetch markets");
+    let market_id = markets
+        .data
+        .iter()
+        .find(|m| m.active && !m.closed)
+        .map(|m| m.condition_id.clone())
+        .expect("no active markets found");
+
+    let mut ws = WebSocketStream::new(WS_USER_URL).with_auth(api_creds);
+    ws.subscribe_user_channel(vec![market_id])
+        .await
+        .expect("failed to subscribe user channel");
+
+    let deadline = tokio::time::Instant::now() + Duration::from_secs(stability_secs(10));
+    while tokio::time::Instant::now() < deadline {
+        match tokio::time::timeout(Duration::from_secs(1), ws.next()).await {
+            Ok(Some(Ok(_msg))) => {},
+            Ok(Some(Err(e))) => panic!("WS error: {:?}", e),
+            Ok(None) => panic!("WS stream ended unexpectedly"),
+            Err(_) => {
+                // No message in this interval; keep waiting.
+            },
+        }
+    }
+}