diff --git a/hate_crack/api.py b/hate_crack/api.py
index eecffc0..52b7345 100644
--- a/hate_crack/api.py
+++ b/hate_crack/api.py
@@ -1138,7 +1138,13 @@ class HashviewAPI:
             data = None
         hashtype = None
         if data:
-            hashtype = data.get("hashtype") or data.get("hash_type") or data.get("type")
+            # Prefer explicit hash-type keys by PRESENCE, not truthiness: MD5 is
+            # hash_type 0, which is falsy. Never fall back to `type` — that is
+            # the envelope tag ("message"), never a hash mode.
+            if "hash_type" in data:
+                hashtype = data["hash_type"]
+            elif "hashtype" in data:
+                hashtype = data["hashtype"]
             if self.debug:
                 print(
                     f"[DEBUG] get_hashfile_details({hashfile_id}): raw data={data}, hashtype={hashtype}"
@@ -1660,21 +1666,28 @@ class HashviewAPI:
     def get_hashfile_hash_type(self, hashtype_id):
         """
         Query /v1/hashfiles/hash_type/<int:hashtype_id> and return a list of file IDs.
+
+        The endpoint answers with an envelope ``{..., "hashfiles": [ {...} ]}``
+        (native JSON objects); we extract the ``id`` of each hashfile.
         """
         url = f"{self.base_url}/v1/hashfiles/hash_type/{hashtype_id}"
         resp = self.session.get(url)
         resp.raise_for_status()
         try:
             data = resp.json()
-            # Expecting a list of file IDs or a dict with a key containing them
+            # A bare list is tolerated for forward/backward compatibility.
             if isinstance(data, list):
-                return data
+                hashfiles = data
             elif isinstance(data, dict):
-                # Try common keys
-                for key in ("file_ids", "ids", "hashfile_ids"):
-                    if key in data and isinstance(data[key], list):
-                        return data[key]
-            return []
+                hashfiles = data.get("hashfiles") or []
+            else:
+                return []
+            ids = []
+            for hf in hashfiles:
+                hf_id = hf.get("id") if isinstance(hf, dict) else hf
+                if hf_id is not None:
+                    ids.append(hf_id)
+            return ids
         except Exception:
             return []
 
diff --git a/tests/test_hashview.py b/tests/test_hashview.py
index 86e2a63..5714413 100644
--- a/tests/test_hashview.py
+++ b/tests/test_hashview.py
@@ -196,6 +196,49 @@ class TestHashviewAPI:
         result = api.list_customers()
         assert result["customers"] == [{"id": 2, "name": "Beta"}]
 
+    def test_get_hashfile_details_md5_zero(self, api):
+        """hash_type 0 (MD5) is falsy; must not fall through to the envelope `type`."""
+        mock_resp = Mock()
+        mock_resp.json.return_value = {
+            "hash_type": 0,
+            "msg": "OK",
+            "status": 200,
+            "type": "message",
+        }
+        mock_resp.raise_for_status = Mock()
+        api.session.get.return_value = mock_resp
+
+        details = api.get_hashfile_details(42)
+        assert details["hashtype"] == 0
+
+    def test_get_hashfile_details_ntlm(self, api):
+        """Sanity: NTLM (1000) still parses from `hash_type`."""
+        mock_resp = Mock()
+        mock_resp.json.return_value = {
+            "hash_type": 1000,
+            "msg": "OK",
+            "status": 200,
+            "type": "message",
+        }
+        mock_resp.raise_for_status = Mock()
+        api.session.get.return_value = mock_resp
+
+        assert api.get_hashfile_details(7)["hashtype"] == 1000
+
+    def test_get_hashfile_hash_type_reads_hashfiles_key(self, api):
+        """Endpoint returns {hashfiles: [...]} objects; return their ids."""
+        mock_resp = Mock()
+        mock_resp.json.return_value = {
+            "status": 200,
+            "type": "message",
+            "msg": "OK",
+            "hashfiles": [{"id": 3, "name": "a"}, {"id": 9, "name": "b"}],
+        }
+        mock_resp.raise_for_status = Mock()
+        api.session.get.return_value = mock_resp
+
+        assert api.get_hashfile_hash_type(1000) == [3, 9]
+
     def test_upload_cracked_hashes_success(self, api, tmp_path):
         """Test uploading cracked hashes with valid lines (real API if possible)."""
         hashview_url, hashview_api_key = self._get_hashview_config()