Klaviyo is a data-driven email and SMS marketing platform that allows e-commerce brands to deliver targeted messages, track conversions, and scale customer relationships
Tools
Add Profile To List
Add profiles to a Klaviyo list by profile IDs or email addresses. This action subscribes profiles to a marketing list, which is ideal for giving marketing consent. You can add up to 1000 profiles per call using either their Klaviyo profile IDs or email addresses. Rate limits: 10/s burst, 150/m steady. Required scopes: `lists:write` and `profiles:write`. Preconditions: - Either profile_ids or emails must be provided (not both) - Maximum 1000 profiles per call - Email addresses must be valid format - The list must exist and be accessible
Assign Campaign Message Template
Creates a non-reusable version of the template and assigns it to the message.<br><br>*Rate limits*:<br>Burst: `10/s`<br>Steady: `150/m` **Scopes:** `campaigns:write`
Bulk Create Client Events
Use the client-side endpoint with a public API key to track profile activity. It accepts up to 1000 events/request with rates of 10/s burst and 150/m steady. For server-side, use the bulk create event endpoint.
Bulk Create Events
Bulk create events for multiple profiles in a single request. Accepts up to 1,000 events with a 5MB max payload. Each event requires a profile identifier (email, phone_number, or external_id) and a metric name. Events are processed asynchronously; a 202 response indicates acceptance, not completion. Rate limits: 10/s burst, 150/min steady.
Cancel Campaign Send
Cancel or revert a campaign send job. Use 'cancel' to permanently stop a campaign (status becomes CANCELED), or 'revert' to return it to DRAFT for editing. This action modifies a campaign send job that is currently queued or sending. The cancel action is irreversible and sets the status to CANCELED. The revert action returns the campaign to DRAFT status, allowing further modifications. Rate limits: 10/s burst, 150/m steady. Required scope: `campaigns:write`. Preconditions: - Valid API key with campaigns:write scope - Campaign send job ID must exist and be accessible - Campaign must be in a state that allows cancellation (queued or sending)
Create Back In Stock Subscription
Use the server-side endpoint to subscribe to restock alerts, following the Back in Stock API guide. For client-side, use the POST endpoint provided. Rate limits: 350/s burst and 3500/m steady. Required scopes: catalogs:write, profiles:write.