diff --git a/plugins/memory/hindsight/__init__.py b/plugins/memory/hindsight/__init__.py
index c40a65b3f..26c60bb9e 100644
--- a/plugins/memory/hindsight/__init__.py
+++ b/plugins/memory/hindsight/__init__.py
@@ -304,7 +304,11 @@ class HindsightMemoryProvider(MemoryProvider):
             mode = cfg.get("mode", "cloud")
             if mode in ("local", "local_embedded", "local_external"):
                 return True
-            has_key = bool(cfg.get("apiKey") or os.environ.get("HINDSIGHT_API_KEY", ""))
+            has_key = bool(
+                cfg.get("apiKey")
+                or cfg.get("api_key")
+                or os.environ.get("HINDSIGHT_API_KEY", "")
+            )
             has_url = bool(cfg.get("api_url") or os.environ.get("HINDSIGHT_API_URL", ""))
             return has_key or has_url
         except Exception:
diff --git a/tests/plugins/memory/test_hindsight_provider.py b/tests/plugins/memory/test_hindsight_provider.py
index d916b2505..45fbab3de 100644
--- a/tests/plugins/memory/test_hindsight_provider.py
+++ b/tests/plugins/memory/test_hindsight_provider.py
@@ -628,3 +628,19 @@ class TestAvailability:
         monkeypatch.setenv("HINDSIGHT_MODE", "local")
         p = HindsightMemoryProvider()
         assert p.is_available()
+
+    def test_available_with_snake_case_api_key_in_config(self, tmp_path, monkeypatch):
+        config_path = tmp_path / "hindsight" / "config.json"
+        config_path.parent.mkdir(parents=True, exist_ok=True)
+        config_path.write_text(json.dumps({
+            "mode": "cloud",
+            "api_key": "config-key",
+        }))
+        monkeypatch.setattr(
+            "plugins.memory.hindsight.get_hermes_home",
+            lambda: tmp_path,
+        )
+
+        p = HindsightMemoryProvider()
+
+        assert p.is_available()