Experience improved consistency and connectivity, clear naming and syntax, and expanded feature parity with our new APIs. Now available!
Learn how to authenticate, how data is stored, and how to make your first API calls.
Klaviyo's new and improved APIs are now available! Start building today!
Explore our previous API documentation. The v1/v2 legacy APIs are scheduled to be end-of-lifed on Jan 1, 2024.
Learn about the differences between our v1/v2 APIs and our new APIs with this comprehensive comparison chart.Migrating from V1/V2 to the new Klaviyo APIs
See how to migrate common use cases from the v1/v2 API to the new Klaviyo APIs.Using the Query Metric Aggregates Endpoint
Learn how to use our new Metric Aggregates endpoint to accomplish unique reporting use cases via API.