diff --git a/README.md b/README.md
index 901c2f4..51b5eb0 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ up: bool = listmonk.is_healthy()
 
 # Read data about your lists
 lists: list[] = listmonk.lists()
-list: MailingList = listmonk.list_by_id(list_id=7)
+the_list: MailingList = listmonk.list_by_id(list_id=7)
 
 # Various ways to access existing subscribers
 subscribers: list[] = listmonk.subscribers(list_id=9)
@@ -58,7 +58,10 @@ new_subscriber = listmonk.create_subscriber(
 # Change the email, custom rating, and add to lists 4 & 6, remove from 5.
 subscriber.email = 'newemail@some.domain'
 subscriber.attribs['rating'] = 7
-updated_subscriber = listmonk.update_subscriber(subscriber, {4, 6}, {5})
+subscriber = listmonk.update_subscriber(subscriber, {4, 6}, {5})
+
+# Confirm single-opt-ins via the API (e.g. for when you manage that on your platform)
+listmonk.confirm_optin(subscriber.uuid, the_list.uuid)
 
 # Disable then re-enable a subscriber
 subscriber = listmonk.disable_subscriber(subscriber)
diff --git a/example_client/client.py b/example_client/client.py
index b0b1874..a3f442c 100644
--- a/example_client/client.py
+++ b/example_client/client.py
@@ -26,8 +26,8 @@
 for lst in lists:
     print(f'{lst.name} list: {lst}')
 
-lst = listmonk.list_by_id(6)
-print(f'List by ID: {lst}')
+the_list = listmonk.list_by_id(test_list_id)
+print(f'List by ID: {the_list}')
 
 print()
 subscribers = listmonk.subscribers(list_id=test_list_id)
@@ -68,9 +68,13 @@
 subscriber.attribs['rating'] = 7
 
 # TODO: Choose list IDs from your instance (can be seen in the UI or from the listing above)
-updated_subscriber = listmonk.update_subscriber(subscriber, {4, 6}, {5})
+to_add = {the_list.id}  # Add all the lists here: {1, 7, 11}
+remove_from = set()  # Same as above
+updated_subscriber = listmonk.update_subscriber(subscriber, to_add, remove_from)
 print(f'Updated subscriber: {updated_subscriber}')
 
+print(f'Subscriber confirmed?: {listmonk.confirm_optin(subscriber.uuid, the_list.uuid)}')
+
 updated_subscriber.attribs['subscription_note'] = \
     "They asked to be unsubscribed so we disabled their account, but no block-listing yet."
 
diff --git a/listmonk/__init__.py b/listmonk/__init__.py
index 0734ea6..b151dcd 100644
--- a/listmonk/__init__.py
+++ b/listmonk/__init__.py
@@ -1,5 +1,6 @@
 from listmonk import impl
 from listmonk import models  # noqa: F401, E402
+from listmonk.impl import confirm_optin  # noqa: F401, E402
 from listmonk.impl import create_subscriber, delete_subscriber, update_subscriber  # noqa: F401, E402
 from listmonk.impl import disable_subscriber, enable_subscriber, block_subscriber  # noqa: F401, E402
 from listmonk.impl import is_healthy  # noqa: F401, E402
@@ -22,5 +23,6 @@
     create_subscriber, delete_subscriber, update_subscriber,
     disable_subscriber, enable_subscriber, block_subscriber,
     send_transactional_email,
+    confirm_optin,
     is_healthy,
 ]
diff --git a/listmonk/impl/__init__.py b/listmonk/impl/__init__.py
index 8019bc0..90a4490 100644
--- a/listmonk/impl/__init__.py
+++ b/listmonk/impl/__init__.py
@@ -291,6 +291,47 @@ def delete_subscriber(email: Optional[str] = None, overriding_subscriber_id: Opt
 
 # endregion
 
+
+# region def confirm_optin(subscriber_uuid: str, list_uuid: str) -> bool
+
+def confirm_optin(subscriber_uuid: str, list_uuid: str) -> bool:
+    global core_headers
+    validate_state(url=True, user=True)
+    if not subscriber_uuid:
+        raise ValueError("subscriber_uuid is required")
+    if not list_uuid:
+        raise ValueError("list_uuid is required")
+
+    #
+    # If there is a better endpoint / API for this, please let me know.
+    # We're reduced to basically submitting the form via web scraping.
+    #
+    payload = {
+        'l': list_uuid,
+        'confirm': 'true',
+
+    }
+    url = f"{url_base}{urls.opt_in.format(subscriber_uuid=subscriber_uuid)}"
+    resp = httpx.post(url, data=payload, follow_redirects=True)
+    resp.raise_for_status()
+
+    success_phrases = {
+        # New conformation was created now.
+        'Subscribed successfully.',
+        'Confirmed',
+
+        # They were already confirmed somehow previously.
+        'no subscriptions to confirm',
+        'No subscriptions'
+    }
+
+    text = resp.text or ''
+    return any(p in text for p in success_phrases)
+
+
+# endregion
+
+
 # region def update_subscriber(subscriber: models.Subscriber, add_to_lists: set[int], remove_from_lists: set[int])
 
 def update_subscriber(subscriber: models.Subscriber, add_to_lists: set[int] = None, remove_from_lists: set[int] = None,
diff --git a/listmonk/urls.py b/listmonk/urls.py
index 64c8b18..bf92e1a 100644
--- a/listmonk/urls.py
+++ b/listmonk/urls.py
@@ -3,4 +3,5 @@
 lst = '/api/lists/{list_id}'
 subscriber = '/api/subscribers/{subscriber_id}'
 subscribers = '/api/subscribers'
+opt_in = '/subscription/optin/{subscriber_uuid}'
 send_tx = '/api/tx'