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description=Release notes for the Loops REST API and webhooks, covering new endpoints, fields, breaking changes, and deprecations across OpenAPI versions.;

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api changelog loops documentation index fetch the complete documentation index at docs llms txt use this file to discover all available pages before exploring further skip to main content loops home page contact us log in loops search navigation api api changelog search k learn get started editing emails workflows events goals contacts transactional email integrations smtp account agent skills for loops security api api introduction api reference examples sdks webhooks api changelog cli overview auth campaigns completion components contact properties contacts email messages events lists themes transactional uploads workflows guides all guides getting started workflows deliverability integrations creating emails recipes email basics on this page july 8 2026 july 2 2026 july 1 2026 june 22 2026 june 19 2026 june 5 2026 may 20 2026 april 24 2026 march 25 2026 february 13 2026 october 17 2025 october 13 2025 september 29 2025 september 11 2025 august 21 2025 may 23 2025 april 29 2025 march 28 2025 february 28 2025 february 5 2025 january 14 2025 december 18 2024 november 5 2024 september 6 2024 august 16 2024 august 15 2024 june 28 2024 june 18 2024 april 18 2024 april 9 2024 march 21 2024 march 13 2024 february 9 2024 january 25 2024 november 6 2023 october 30 2023 october 12 2023 api api changelog copy page release notes for the loops rest api and webhooks covering new endpoints fields breaking changes and deprecations across openapi versions copy page july 8 2026 new endpoints for creating and updating themes and components july 2 2026 new guardian endpoint for validating email message content via the api july 1 2026 new a transactionalname field in the transactional email sent webhook event june 22 2026 new endpoints for viewing workflows and workflow nodes these endpoints are currently in open alpha june 19 2026 new endpoints for campaign groups transactional groups audience segments and email message previews updated campaign endpoints now support audience targeting mailing list segment or filter groups and scheduling email message endpoints now support cc bcc language email format and property fallbacks transactional email endpoints now support groups june 5 2026 new endpoints for creating and editing transactional emails these endpoints are currently in an open alpha may 20 2026 new upload endpoints for uploading images to use in emails april 24 2026 new endpoints for creating and editing campaigns these endpoints are currently in an open alpha march 25 2026 new api endpoints to check and remove suppression for contacts february 13 2026 new a campaignname field in the campaign email sent webhook event october 17 2025 new an email resubscribed webhook event for when contacts resubscribe to your marketing email from an email s unsubscribe link october 13 2025 new an optinstatus field from double opt in in the find contact endpoint and in contact created webhook events september 29 2025 new webhooks are now available to all users september 11 2025 improvement all endpoints now return a success and message field in the error response bodies error and path top level keys are now deprecated but will continue to be supported for some time for backward compatibility august 21 2025 the docs have been updated to reflect that the email parameter is optional in the update contact endpoint if a userid is provided may 23 2025 improvement data variables are now optional in the send transactional email endpoint read more april 29 2025 new an idempotency key header when sending events march 28 2025 new an idempotency key header when sending transactional emails february 28 2025 new an endpoint for listing transactional emails and their data variables february 5 2025 new webhooks are in beta january 14 2025 new new endpoints for creating contact properties and listing contact properties deprecation the list custom fields endpoint is now deprecated in favor of the new list contact properties endpoint december 18 2024 new we added description to mailing list objects in the list mailing lists endpoint november 5 2024 improvement the maximum payload size for the transactional endpoint has been increased from 1mb to 4mb allowing for more or larger attachments september 6 2024 new our new nuxt module is now out august 16 2024 new our new ruby sdk is available august 15 2024 new we added an ispublic attribute to mailing list objects in the list mailing lists endpoint june 28 2024 new there s a new addtoaudience parameter in the send transactional email endpoint that can add contacts to your audience june 18 2024 new support for our new mailing lists feature you can now add contacts to and remove contacts from mailing lists in the create contact update contact and send event endpoints there is also a new endpoint for retrieving your mailing lists april 18 2024 new you can now find contacts by userid april 9 2024 new a new endpoint for testing your integration and or api key api key march 21 2024 new you can now include event properties in requests to the send event endpoint march 13 2024 improvement we removed behavior that returned a 400 bad request response if an unrecognized property was added to contact endpoints february 9 2024 improvement sending in a payload that contains an unrecognized property will now return a 400 bad request response january 25 2024 clarification in the api docs that userid can be used in a send event request november 6 2023 new we added a new endpoint for querying custom contact properties october 30 2023 our official javascript typescript sdk is now available october 12 2023 new we now accept dates as a custom contact property type view the available formats last modified on july 9 2026 was this page helpful yes no webhooks previous loops cli next i x linkedin assistant responses are generated using ai and may contain mistakes contact support