Klaviyo

Klaviyo Campaigns API

campaigns

GitHub OpenAPI
Business capability
Digital Marketing Management BC-400.60

Operations 26

GET /api/campaigns Get Campaigns #
POST /api/campaigns Create Campaign #
GET /api/campaigns/{id} Get Campaign #
PATCH /api/campaigns/{id} Update Campaign #
DELETE /api/campaigns/{id} Delete Campaign #
GET /api/campaign-messages/{id} Get Campaign Message #
PATCH /api/campaign-messages/{id} Update Campaign Message #
GET /api/campaign-send-jobs/{id} Get Campaign Send Job #
PATCH /api/campaign-send-jobs/{id} Cancel Campaign Send #
GET /api/campaign-recipient-estimation-jobs/{id} Get Campaign Recipient Estimation Job #
GET /api/campaign-recipient-estimations/{id} Get Campaign Recipient Estimation #
POST /api/campaign-clone Create Campaign Clone #
POST /api/campaign-message-assign-template Assign Template to Campaign Message #
POST /api/campaign-send-jobs Send Campaign #
POST /api/campaign-recipient-estimation-jobs Refresh Campaign Recipient Estimation #
GET /api/campaign-messages/{id}/campaign Get Campaign for Campaign Message #
GET /api/campaign-messages/{id}/relationships/campaign Get Campaign ID for Campaign Message #
GET /api/campaign-messages/{id}/template Get Template for Campaign Message #
GET /api/campaign-messages/{id}/relationships/template Get Template ID for Campaign Message #
GET /api/campaign-messages/{id}/image Get Image for Campaign Message #
GET /api/campaign-messages/{id}/relationships/image Get Image ID for Campaign Message #
PATCH /api/campaign-messages/{id}/relationships/image Update Image for Campaign Message #
GET /api/campaigns/{id}/tags Get Tags for Campaign #
GET /api/campaigns/{id}/relationships/tags Get Tag IDs for Campaign #
GET /api/campaigns/{id}/campaign-messages Get Messages for Campaign #
GET /api/campaigns/{id}/relationships/campaign-messages Get Message IDs for Campaign #

Documentation

📖
Documentation
https://developers.klaviyo.com/
📖
Authentication
https://developers.klaviyo.com/en/docs/authenticate_
📖
RateLimits
https://developers.klaviyo.com/en/docs/rate_limits_and_error_handling

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/klaviyo/refs/heads/main/openapi/klaviyo-campaigns-api-openapi.yml
⚙
AsyncAPI
https://raw.githubusercontent.com/api-evangelist/klaviyo/refs/heads/main/asyncapi/klaviyo-webhooks-asyncapi.yaml

Other Resources

🔗
Reference
https://developers.klaviyo.com/en/reference/api_overview
🔗
Versioning
https://developers.klaviyo.com/en/docs/api_versioning_and_deprecation_policy
🔗
ChangeLog
https://developers.klaviyo.com/en/docs/changelog_
🔗
SDKs
https://developers.klaviyo.com/en/docs/sdk_overview
🔗
GitHub
https://github.com/klaviyo/openapi
🔗
Overlay
https://raw.githubusercontent.com/api-evangelist/klaviyo/refs/heads/main/overlays/klaviyo-campaigns-api-overlay.yaml

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/klaviyo-campaigns-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

klaviyo-campaigns-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Klaviyo Campaigns API
  version: '2026-04-15'
  description: The Klaviyo REST API. Please visit https://developers.klaviyo.com for more details.
  contact:
    name: Klaviyo Developer Experience Team
    email: developers@klaviyo.com
    url: https://developers.klaviyo.com
  termsOfService: https://www.klaviyo.com/legal/api-terms
  license:
    name: License
    url: https://www.klaviyo.com/legal
servers:
- url: https://a.klaviyo.com
  description: Production
security:
- Klaviyo-API-Key: []
tags:


# --- truncated at 32 KB (139 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/klaviyo/refs/heads/main/openapi/klaviyo-campaigns-api-openapi.yml