We have extended the timeline to migrate from the Contacts Lists API to the V3 Lists API from September 30th, 2025 to April 30th, 2026.
On April 30th, 2026 all endpoints from the Contacts Lists API will be deprecated and return a 404 error response message.
We're sunsetting the Contacts Lists API to focus our development efforts on the improved V3 Lists API, which offers a richer and more comprehensive experience that's closely aligned with the HubSpot Lists app experience.
The documentation for the Lists v3 API now includes helpful tips to help you migrate!
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