diff --git a/pyfragment/methods/search_gifts.py b/pyfragment/methods/search_gifts.py
index 33fd431..badea9e 100644
--- a/pyfragment/methods/search_gifts.py
+++ b/pyfragment/methods/search_gifts.py
@@ -45,7 +45,7 @@ async def search_gifts(
         FragmentAPIError: If the Fragment API returns an error.
         UnexpectedError: For any other unexpected failure.
     """
-    data: dict[str, Any] = {"method": "searchAuctions", "type": "gifts", "query": query}
+    data: dict[str, Any] = {"type": "gifts", "query": query}
     if collection is not None:
         data["collection"] = collection
     if sort is not None:
diff --git a/pyfragment/methods/search_numbers.py b/pyfragment/methods/search_numbers.py
index e82e32e..87b02fa 100644
--- a/pyfragment/methods/search_numbers.py
+++ b/pyfragment/methods/search_numbers.py
@@ -37,7 +37,7 @@ async def search_numbers(
         FragmentAPIError: If the Fragment API returns an error.
         UnexpectedError: For any other unexpected failure.
     """
-    data: dict[str, Any] = {"method": "searchAuctions", "type": "numbers", "query": query}
+    data: dict[str, Any] = {"type": "numbers", "query": query}
     if sort is not None:
         data["sort"] = sort
     if filter is not None:
diff --git a/pyfragment/methods/search_usernames.py b/pyfragment/methods/search_usernames.py
index 0fd4c39..890dff2 100644
--- a/pyfragment/methods/search_usernames.py
+++ b/pyfragment/methods/search_usernames.py
@@ -37,7 +37,7 @@ async def search_usernames(
         FragmentAPIError: If the Fragment API returns an error.
         UnexpectedError: For any other unexpected failure.
     """
-    data: dict[str, Any] = {"method": "searchAuctions", "type": "usernames", "query": query}
+    data: dict[str, Any] = {"type": "usernames", "query": query}
     if sort is not None:
         data["sort"] = sort
     if filter is not None:
diff --git a/pyfragment/types/exceptions.py b/pyfragment/types/exceptions.py
index be28af0..5f34a29 100644
--- a/pyfragment/types/exceptions.py
+++ b/pyfragment/types/exceptions.py
@@ -46,6 +46,7 @@ class CookieError(ClientError):
         "Fragment cookies not found in {browser}: {keys}. "
         "Make sure you are logged in to {url} and have connected your TON wallet in {browser}."
     )
+    EXPIRED = "Fragment session cookie expired at {expires}. Log in to fragment.com in your browser and extract fresh cookies."
 
 
 class FragmentAPIError(FragmentError):
diff --git a/pyfragment/utils/cookies.py b/pyfragment/utils/cookies.py
index 8e24495..7f9aaa4 100644
--- a/pyfragment/utils/cookies.py
+++ b/pyfragment/utils/cookies.py
@@ -61,6 +61,11 @@ def get_cookies_from_browser(browser: str = "chrome") -> CookieResult:
                         continue
             break
 
+    if expires_iso:
+        expires_dt = datetime.fromisoformat(expires_iso)
+        if expires_dt < datetime.now(timezone.utc):
+            raise CookieError(CookieError.EXPIRED.format(expires=expires_iso))
+
     return CookieResult(
         cookies={k: cookie_map[k] for k in REQUIRED_COOKIE_KEYS},
         expires=expires_iso,
diff --git a/pyfragment/utils/http.py b/pyfragment/utils/http.py
index a9672d1..5009506 100644
--- a/pyfragment/utils/http.py
+++ b/pyfragment/utils/http.py
@@ -111,6 +111,8 @@ async def fragment_request(
         headers=headers,
         data=data,
     )
+    if resp.status_code != 200:
+        raise FragmentPageError(FragmentPageError.BAD_STATUS.format(status=resp.status_code, url=f"{FRAGMENT_BASE_URL}/api"))
     return parse_json_response(resp, data.get("method", "request"))
 
 
diff --git a/pyfragment/utils/wallet.py b/pyfragment/utils/wallet.py
index 49fdec6..7a67018 100644
--- a/pyfragment/utils/wallet.py
+++ b/pyfragment/utils/wallet.py
@@ -34,7 +34,7 @@ async def process_transaction(client: FragmentClient, transaction_data: dict[str
         TransactionError: If the payload is malformed or the broadcast fails.
         WalletError: If the wallet balance is too low or cannot be fetched.
     """
-    if "transaction" not in transaction_data or "messages" not in transaction_data["transaction"]:
+    if "transaction" not in transaction_data or not transaction_data["transaction"].get("messages"):
         raise TransactionError(TransactionError.INVALID_PAYLOAD)
 
     message = transaction_data["transaction"]["messages"][0]
diff --git a/tests/003_test_balance.py b/tests/003_test_balance.py
index ab95492..6fa91b5 100644
--- a/tests/003_test_balance.py
+++ b/tests/003_test_balance.py
@@ -103,6 +103,12 @@ async def test_invalid_payload_raises() -> None:
         await process_transaction(_make_client(), {"transaction": {}})
 
 
+@pytest.mark.asyncio
+async def test_empty_messages_list_raises() -> None:
+    with pytest.raises(TransactionError):
+        await process_transaction(_make_client(), {"transaction": {"messages": []}})
+
+
 @pytest.mark.asyncio
 async def test_balance_check_failed_raises_wallet_error() -> None:
     wallet = _make_wallet(balance_nanotons=1_000_000_000)
diff --git a/tests/008_test_call.py b/tests/008_test_call.py
index 14b6b59..78404cb 100644
--- a/tests/008_test_call.py
+++ b/tests/008_test_call.py
@@ -1,10 +1,13 @@
 """Unit tests for FragmentClient.call() — raw Fragment API access."""
 
-from unittest.mock import AsyncMock, patch
+from unittest.mock import AsyncMock, MagicMock, patch
 
+import httpx
 import pytest
 
 from pyfragment import FragmentClient
+from pyfragment.types import FragmentPageError
+from pyfragment.utils.http import fragment_request
 from tests.shared import FAKE_HASH, FAKE_RESPONSE
 
 # client.call() mocked tests
@@ -61,3 +64,19 @@ async def test_call_merges_extra_data(client: FragmentClient) -> None:
 
     _, _, _, sent_data = mock_request.call_args.args
     assert sent_data == {"method": "anyMethod", "key": "value", "num": 7}
+
+
+# fragment_request HTTP status tests
+
+
+@pytest.mark.asyncio
+async def test_fragment_request_non_200_raises() -> None:
+    """fragment_request raises FragmentPageError on non-200 HTTP responses."""
+    response = MagicMock(spec=httpx.Response)
+    response.status_code = 429
+
+    session = AsyncMock(spec=httpx.AsyncClient)
+    session.post = AsyncMock(return_value=response)
+
+    with pytest.raises(FragmentPageError, match="429"):
+        await fragment_request(session, FAKE_HASH, {}, {"method": "anyMethod"})
diff --git a/tests/014_test_cookies.py b/tests/014_test_cookies.py
index 6f927b4..83d6c3d 100644
--- a/tests/014_test_cookies.py
+++ b/tests/014_test_cookies.py
@@ -106,6 +106,21 @@ def test_empty_cookie_value_treated_as_missing() -> None:
             get_cookies_from_browser("chrome")
 
 
+# expired cookie tests
+
+
+def test_expired_cookie_raises() -> None:
+    expired_jar = [
+        {"name": "stel_ssid", "value": "abc123", "expires": "2020-01-01T00:00:00.000Z"},
+        {"name": "stel_dt", "value": "-120"},
+        {"name": "stel_token", "value": "tok_xyz"},
+        {"name": "stel_ton_token", "value": "ton_xyz"},
+    ]
+    with patch(PATCH, _mock_rookiepy(expired_jar)):
+        with pytest.raises(CookieError, match="expired"):
+            get_cookies_from_browser("chrome")
+
+
 # read failure tests