diff --git a/httpobs/website/__init__.py b/httpobs/website/__init__.py
index dc2d3f4..5684dd6 100644
--- a/httpobs/website/__init__.py
+++ b/httpobs/website/__init__.py
@@ -1,3 +1,13 @@
-from httpobs.website.decorators import add_response_headers, sanitized_api_response
+from httpobs.website.decorators import (
+    add_response_headers,
+    add_sunset_headers,
+    check_for_deprecation_override_header,
+    sanitized_api_response,
+)
 
-__all__ = ['add_response_headers', 'sanitized_api_response']
+__all__ = [
+    'add_response_headers',
+    'sanitized_api_response',
+    'add_sunset_headers',
+    'check_for_deprecation_override_header',
+]
diff --git a/httpobs/website/api.py b/httpobs/website/api.py
index be5b65b..aa01ce1 100644
--- a/httpobs/website/api.py
+++ b/httpobs/website/api.py
@@ -10,7 +10,12 @@
 from httpobs.conf import API_ALLOW_VERBOSE_STATS_FROM_PUBLIC, API_COOLDOWN, DEVELOPMENT_MODE
 from httpobs.scanner import scan
 from httpobs.scanner.grader import GRADES, get_score_description
-from httpobs.website import add_response_headers, sanitized_api_response
+from httpobs.website import (
+    add_response_headers,
+    add_sunset_headers,
+    check_for_deprecation_override_header,
+    sanitized_api_response,
+)
 from httpobs.website.utils import valid_hostname
 
 api = Blueprint('api', __name__)
@@ -20,6 +25,8 @@
 
 
 @api.route('/api/v1/analyze', methods=['GET', 'OPTIONS', 'POST'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers(cors=True)
 @sanitized_api_response
 def api_post_scan_hostname():
@@ -119,6 +126,8 @@ def api_post_scan_hostname():
 
 # TODO: Deprecate this and replace with __stats__ once website is updated
 @api.route('/api/v1/getGradeDistribution', methods=['GET', 'OPTIONS'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers(cors=True)
 def api_get_grade_totals():
     totals = database.select_star_from('grade_distribution')
@@ -130,6 +139,8 @@ def api_get_grade_totals():
 
 
 @api.route('/api/v1/getHostHistory', methods=['GET', 'OPTIONS'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers(cors=True)
 def api_get_host_history():
     # Get the hostname
@@ -163,6 +174,8 @@ def api_get_host_history():
 
 
 @api.route('/api/v1/getRecentScans', methods=['GET', 'OPTIONS'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers(cors=True)
 def api_get_recent_scans():
     try:
@@ -184,6 +197,8 @@ def api_get_recent_scans():
 
 # TODO: Deprecate
 @api.route('/api/v1/getScannerStates', methods=['GET', 'OPTIONS'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers(cors=True)
 def api_get_scanner_states():
     stats = database.select_scan_scanner_statistics(verbose=False)
@@ -192,6 +207,8 @@ def api_get_scanner_states():
 
 
 @api.route('/api/v1/__stats__', methods=['GET', 'OPTIONS'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers(cors=True)
 def api_get_scanner_stats():
     pretty = True if request.args.get('pretty', '').lower() == 'true' else False
@@ -259,6 +276,8 @@ def api_get_scanner_stats():
 
 
 @api.route('/api/v1/getScanResults', methods=['GET', 'OPTIONS'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers(cors=True)
 @sanitized_api_response
 def api_get_scan_results():
@@ -288,6 +307,8 @@ def api_get_scan_results():
 
 
 @api.route('/contribute.json', methods=['GET'])
+@add_sunset_headers()
+@check_for_deprecation_override_header
 @add_response_headers()
 def contribute_json():
     __dirname = os.path.abspath(os.path.dirname(__file__))
diff --git a/httpobs/website/decorators.py b/httpobs/website/decorators.py
index 53cccaf..cb10996 100644
--- a/httpobs/website/decorators.py
+++ b/httpobs/website/decorators.py
@@ -3,6 +3,55 @@
 from flask import jsonify, make_response, request
 
 
+def add_sunset_headers():
+    """
+    Adds a "Sunset" header to the response
+    """
+
+    def decorator(fn):
+        @wraps(fn)
+        def wrapper(*args, **kwargs):
+            resp = make_response(fn(*args, **kwargs))
+            resp.headers['Sunset'] = 'Thu, 31 Oct 2024 23:59:59 GMT'
+            return resp
+
+        return wrapper
+
+    return decorator
+
+
+def check_for_deprecation_override_header(fn):
+    """
+    Checks for the "X-Deprecation-Override" header and sets the response accordingly:
+    - If the header is set to "yes", it will return the response as normal
+    - If the header is set to anything else, it will return a 410 Gone response
+    """
+
+    @wraps(fn)
+    def wrapper(*args, **kwargs):
+        if request.headers.get('X-Deprecation-Override', 'no').lower() == 'yes':
+            return fn(*args, **kwargs)
+        else:
+            return make_response(
+                """
+This API has been deprecated and is no longer available.
+Please use https://observatory-api.mdn.mozilla.net/.
+For details about the new endpint, see
+https://github.com/mdn/mdn-http-observatory/blob/main/README.md#post-apiv2scan.
+
+If you really want to continue with this endpoint for now,
+please add a header to your request in the form of
+
+X-Deprecation-Override: yes
+
+Be aware that this API will go away without further warning on Oct 31, 2024.
+    """,
+                410,
+            )
+
+    return wrapper
+
+
 def add_response_headers(headers=None, default_headers=None, cors=False):
     """
     Adds a bunch of headers to the Flask responses
diff --git a/httpobs/website/main.py b/httpobs/website/main.py
index b7e6ad7..2dbf94b 100644
--- a/httpobs/website/main.py
+++ b/httpobs/website/main.py
@@ -3,7 +3,7 @@
 from flask import Flask
 
 from httpobs.conf import API_PORT, API_PROPAGATE_EXCEPTIONS, DEVELOPMENT_MODE
-from httpobs.website import add_response_headers
+from httpobs.website import add_response_headers, add_sunset_headers
 from httpobs.website.api import api
 from httpobs.website.monitoring import monitoring_api
 
@@ -21,6 +21,7 @@ def __exit_with(msg: str) -> None:
 
 
 @app.route('/')
+@add_sunset_headers()
 @add_response_headers()
 def main() -> str:
     return 'Welcome to the HTTP Observatory!'