I have received an email from the HubSpot team stating that, as of April 30, 2026, most v1 contact list API endpoints will be removed and will return errors. Some contact API endpoints will also be affected.
I have identified that we are currently making calls to v1 endpoints. These will no longer work after April 30, 2026.
email Content :
The HubSpot team would like to remind you to update the contact lists API before April 30, 2026.
What is changing:
As of April 30, 2026, all v1 contact list API endpoints, with the exception of three, will be removed and will return errors.
Some contact API endpoints will also be affected.
Details about the affected endpoints are available in this changelog article:
https://developers.hubspot.com/changelog/extension-contact-lists-api-v1-sunset-moved-to-april-30-2026?utm_medium=email&utm_content=410822611&utm_source=hs_automation
Action required:
Migrate to the latest version of the lists API (v3) before April 30, 2026.
For detailed instructions on how to update, please refer to this migration guide.
As of April 30, all calls to v1 endpoints will return errors.