diff --git a/components/api_server/src/healthcheck.py b/components/api_server/src/healthcheck.py
index 04a9a93548..0f7df23cc8 100644
--- a/components/api_server/src/healthcheck.py
+++ b/components/api_server/src/healthcheck.py
@@ -8,7 +8,7 @@
 api_server_port = getenv("API_SERVER_PORT", "5001")
 exit_code = 1
 try:
-    with urlopen(f"http://localhost:{api_server_port}/api/health") as response:  # nosec B310
-        exit_code = 0 if response.status == HTTPStatus.OK else 1
+    with urlopen(f"http://localhost:{api_server_port}/api/internal/health") as response:  # nosec B310
+        exit_code = 0 if response.status == HTTPStatus.OK and response.read() == '{"healthy": true}' else 1
 finally:
     sys.exit(exit_code)
diff --git a/components/api_server/src/routes/__init__.py b/components/api_server/src/routes/__init__.py
index c20e052e08..ae4a9181c4 100644
--- a/components/api_server/src/routes/__init__.py
+++ b/components/api_server/src/routes/__init__.py
@@ -9,7 +9,8 @@
     get_report_changelog,
 )
 from .datamodel import get_data_model
-from .documentation import get_api
+from .documentation import get_api_docs
+from .health import get_health
 from .logo import get_logo
 from .measurement import get_metric_measurements, get_measurements, set_entity_attribute, stream_nr_measurements
 from .metric import (
diff --git a/components/api_server/src/routes/documentation.py b/components/api_server/src/routes/documentation.py
index e1ec34f9f5..b25d9e1457 100644
--- a/components/api_server/src/routes/documentation.py
+++ b/components/api_server/src/routes/documentation.py
@@ -6,17 +6,18 @@
 
 
 @bottle.get("/api", authentication_required=False)
-@bottle.get("/api/<fragment>", authentication_required=False)
-@bottle.get("/api/<version>/<fragment>", authentication_required=False)
-def get_api(version="", fragment=""):
-    """Return the API. Use version and/or fragment to limit the routes returned."""
+@bottle.get("/api/", authentication_required=False)
+def get_api_docs() -> dict[str, dict[str, str]]:
+    """Return the API docs."""
     port = os.environ.get("API_SERVER_PORT", "5001")
-    routes = [route for route in bottle.default_app().routes if version in route.rule and fragment in route.rule]
-    return {
+    docs = {
         route.rule: {
             "url": f"https://www.quality-time.example.org:{port}{route.rule}",
             "method": route.method,
             "description": route.callback.__doc__,
         }
-        for route in routes
+        for route in bottle.default_app().routes
     }
+    if not docs:
+        bottle.abort(404, bottle.HTTP_CODES[404])
+    return docs
diff --git a/components/api_server/src/routes/health.py b/components/api_server/src/routes/health.py
new file mode 100644
index 0000000000..67c9033571
--- /dev/null
+++ b/components/api_server/src/routes/health.py
@@ -0,0 +1,9 @@
+"""Health end-point."""
+
+import bottle
+
+
+@bottle.get("/api/internal/health", authentication_required=False)
+def get_health():
+    """Return the API-server health."""
+    return {"healthy": True}
diff --git a/components/api_server/tests/routes/test_documentation.py b/components/api_server/tests/routes/test_documentation.py
index 9e5c2d2f71..5a85122750 100644
--- a/components/api_server/tests/routes/test_documentation.py
+++ b/components/api_server/tests/routes/test_documentation.py
@@ -2,7 +2,9 @@
 
 import unittest
 
-from routes import get_api
+import bottle
+
+from routes import get_api_docs
 
 EXTERNAL_API_VERSION = "v3"
 
@@ -16,22 +18,8 @@ class DocumentationTest(unittest.TestCase):
 
     def test_get_api(self):
         """Test that the API can be retrieved."""
-        api_json = get_api()
+        api_json = get_api_docs()
         self.assertIn("/api", api_json)
         self.assertIn(self.login_internal, api_json)
         self.assertIn(self.login_external, api_json)
         self.assertIn(self.server_external, api_json)
-
-    def test_get_api_by_version(self):
-        """Test that the API can be filtered by version."""
-        api_json = get_api(EXTERNAL_API_VERSION)
-        self.assertNotIn(self.login_internal, api_json)
-        self.assertIn(self.login_external, api_json)
-        self.assertIn(self.server_external, api_json)
-
-    def test_get_api_by_fragment(self):
-        """Test that the API can be filtered by version and a fragment."""
-        api_json = get_api(EXTERNAL_API_VERSION, "login")
-        self.assertNotIn(self.login_internal, api_json)
-        self.assertIn(self.login_external, api_json)
-        self.assertNotIn(self.server_external, api_json)
diff --git a/components/api_server/tests/routes/test_health.py b/components/api_server/tests/routes/test_health.py
new file mode 100644
index 0000000000..d613a04ee6
--- /dev/null
+++ b/components/api_server/tests/routes/test_health.py
@@ -0,0 +1,13 @@
+"""Unit tests for the health route."""
+
+import unittest
+
+from routes import get_health
+
+
+class HealthTest(unittest.TestCase):
+    """Unit tests for the health route."""
+
+    def test_health(self):
+        """Test that the health status can be retrieved."""
+        self.assertEqual({"healthy": True}, get_health())
diff --git a/components/api_server/tests/test_healthcheck.py b/components/api_server/tests/test_healthcheck.py
index 2f3f7a98fa..a60b1b4f09 100644
--- a/components/api_server/tests/test_healthcheck.py
+++ b/components/api_server/tests/test_healthcheck.py
@@ -14,6 +14,7 @@ def test_healthy(self, mock_urlopen, mock_exit):
         """Test that the server is healthy."""
         response = MagicMock()
         response.status = HTTPStatus.OK
+        response.read.return_value = '{"healthy": true}'
         response.__enter__.return_value = response
         mock_urlopen.return_value = response
         import healthcheck  # noqa: F401
diff --git a/docs/src/changelog.md b/docs/src/changelog.md
index 1b76d0b473..d90e7e774b 100644
--- a/docs/src/changelog.md
+++ b/docs/src/changelog.md
@@ -12,6 +12,12 @@ If your currently installed *Quality-time* version is not the latest version, pl
 
 <!-- The line "## <square-bracket>Unreleased</square-bracket>" is replaced by the release/release.py script with the new release version and release date. -->
 
+## [Unreleased]
+
+### Fixed
+
+- Make the API-server return HTTP status 404 on non-existing endpoints instead of 200. Fixes [#9860](https://github.com/ICTU/quality-time/issues/9860).
+
 ## v5.24.0 - 2025-02-06
 
 ### Added
diff --git a/docs/src/development.md b/docs/src/development.md
index 2562baf8bf..d8781b1568 100644
--- a/docs/src/development.md
+++ b/docs/src/development.md
@@ -77,6 +77,12 @@ python src/quality_time_server.py
 
 The API of the API-server is served at [http://localhost:5001](http://localhost:5001), e.g. access [http://localhost:5001/api/internal/report](http://localhost:5001/api/internal/report) to get the available reports combined with their recent measurements.
 
+To quickly see all endpoints, point curl at `/api`:
+
+```console
+curl http://localhost:5001/api | jq .
+```
+
 ```{note}
 If you're new to Python virtual environments, note that:
 - Creating a virtual environment (`uv venv`) has to be done once. Only when the Python version changes, you want to recreate the virtual environment.
diff --git a/tests/feature_tests/src/features/auth.feature b/tests/feature_tests/src/features/auth.feature
index 09ace4a0ab..9c53797a6b 100644
--- a/tests/feature_tests/src/features/auth.feature
+++ b/tests/feature_tests/src/features/auth.feature
@@ -11,6 +11,10 @@ Feature: authentication
     When the client tries to log in with incorrect credentials
     Then the server tells the client the credentials are incorrect
 
+  Scenario: non-existing endpoint
+    When the client tries to access a non-existing endpoint
+    Then the server tells the client the endpoint does not exist
+
   Scenario: change editors
     When jadoe logs in
     And the client changes the reports_overview permissions to "{"edit_reports": ["jadoe", "other_user"], "edit_entities": []}"
diff --git a/tests/feature_tests/src/steps/auth.py b/tests/feature_tests/src/steps/auth.py
index 0ce614ccbd..d0647e0c83 100644
--- a/tests/feature_tests/src/steps/auth.py
+++ b/tests/feature_tests/src/steps/auth.py
@@ -26,6 +26,12 @@ def log_in_with_incorrect_credentials(context: Context) -> None:
     context.post("login", {"username": "jadoe", "password": "wrong"})  # nosec
 
 
+@when("the client tries to access a non-existing endpoint")
+def access_non_existing_endpoint(context: Context) -> None:
+    """Try to access non-existing endpoint."""
+    context.get("does-not-exist")
+
+
 @then("the server tells the client the credentials are incorrect")
 def check_invalid_credentials(context: Context) -> None:
     """Check that the server responded that the credentials are invalid."""
@@ -44,6 +50,12 @@ def check_unauthorized(context: Context) -> None:
     assert_equal(403, context.response.status_code)
 
 
+@then("the server tells the client the endpoint does not exist")
+def check_does_not_exist(context: Context) -> None:
+    """Check that the server responded with a resource does not exist error message."""
+    assert_equal(404, context.response.status_code)
+
+
 @when("the client requests the public key")
 def get_public_key(context: Context) -> None:
     """Get the public key."""