Mailchimp Marketing API

Alert history

• Additive

  Add survey replicate endpoint and WhatsApp events; document field changes

  Jul 16, 2026, 3:00 PM

  The API adds a new /lists/{list_id}/surveys/{survey_id}/actions/replicate endpoint for survey operations, expands the WhatsApp event types supported (adding bulk_sent, link_click, subscribe, subscription_phone_updated, unsubscribe, and used_keyword), and moves the thumbnail field in ad outreach responses to be properly nested under the ad object. Additionally, the include_total_contacts parameter and total_contacts response field are documented as deprecated with guidance to use the /audiences endpoint instead. New survey field types (contactInformation and dropdown) are also added.

• Additive

  Add pixel enable/disable endpoints for connected sites

  Jun 5, 2026, 6:00 PM

  Two new POST endpoints have been added to the Mailchimp Marketing API: POST /connected-sites/{connected_site_id}/actions/enable-pixel and POST /connected-sites/{connected_site_id}/actions/disable-pixel to control the Mailchimp tracking pixel for connected sites. These are purely additive and do not affect existing integrations.

• Additive

  Add pixel management and consent timestamp fields

  Jun 4, 2026, 3:00 PM

  Mailchimp Marketing API adds two new optional endpoints for managing tracking pixels (/enable-pixel and /disable-pixel), new read-only is_pixel_enabled field on connected site responses, and new optional captured_at timestamp fields for email and SMS marketing consent objects. These are purely additive changes that enhance consent tracking and pixel management without altering existing behavior.