KlaviyoAPIintegration&MCPserver

Deliver real-time Marketing faster, close sales deals sooner, and scale without an integration backlog.

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Add Klaviyo and 6 other pre-built Marketing integrations

Real-time data to fuel countless Marketing use cases

Power AI copilots, insights, predictive analysis, and automation with a modern integration infrastructure that scales alongside you.

martech

Analyze Campaigns

Leverage real-time aggregated campaign data from multiple sources into a single dashboard.

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martech

Nurture Leads

Integrate customer data from multiple systems to automate nurturing workflows.

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martech

Personalize Content

Power AI content recommendations with customer data from various marketing systems.

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Unified MCP

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MARTECH List

MARTECH Member

Passthrough

MARTECH List

MARTECH Member

Passthrough

Your customer's data

on Klaviyo

Unified API data-models and methods

MARTECH List

list get remove create update

MARTECH Member

list get create update

Passthrough

get post put patch delete

187 Unified MCP tools

create a list7 parameters

list all lists6 parameters

retrieve a list2 parameters

update a list8 parameters

remove a list2 parameters

create a member5 parameters

list all members7 parameters

retrieve a member2 parameters

update a member6 parameters

get accounts2 parameters

get account4 parameters

get campaigns8 parameters

create campaign2 parameters

get campaign7 parameters

update campaign4 parameters

delete campaign3 parameters

get campaign message7 parameters

update campaign message4 parameters

get campaign send job4 parameters

update campaign send job4 parameters

get campaign recipient estimation job4 parameters

get campaign recipient estimation4 parameters

create campaign clone2 parameters

assign campaign message template2 parameters

create campaign send job2 parameters

create campaign recipient estimation job2 parameters

get campaign message relationships campaign3 parameters

get campaign message campaign4 parameters

get campaign message relationships template3 parameters

get campaign message template4 parameters

get campaign relationships tags3 parameters

get campaign tags4 parameters

get campaign relationships campaign messages3 parameters

get campaign campaign messages7 parameters

get catalog items7 parameters

create catalog item2 parameters

get catalog item6 parameters

update catalog item4 parameters

delete catalog item3 parameters

get catalog variants5 parameters

create catalog variant2 parameters

get catalog variant4 parameters

update catalog variant4 parameters

delete catalog variant3 parameters

get catalog categories5 parameters

create catalog category2 parameters

get catalog category4 parameters

update catalog category4 parameters

delete catalog category3 parameters

get create items jobs4 parameters

spawn create items job2 parameters

get create items job6 parameters

get update items jobs4 parameters

spawn update items job2 parameters

get update items job6 parameters

get delete items jobs4 parameters

spawn delete items job2 parameters

get delete items job4 parameters

get create variants jobs4 parameters

spawn create variants job2 parameters

get create variants job6 parameters

get update variants jobs4 parameters

spawn update variants job2 parameters

get update variants job6 parameters

get delete variants jobs4 parameters

spawn delete variants job2 parameters

get delete variants job4 parameters

get create categories jobs4 parameters

spawn create categories job2 parameters

get create categories job6 parameters

get update categories jobs4 parameters

spawn update categories job2 parameters

get update categories job6 parameters

get delete categories jobs4 parameters

spawn delete categories job2 parameters

get delete categories job4 parameters

create back in stock subscription2 parameters

get catalog category items9 parameters

get catalog item variants7 parameters

get catalog item categories7 parameters

get catalog category relationships items4 parameters

create catalog category relationships items4 parameters

update catalog category relationships items4 parameters

delete catalog category relationships items3 parameters

get catalog item relationships categories4 parameters

create catalog item relationships categories4 parameters

update catalog item relationships categories4 parameters

delete catalog item relationships categories3 parameters

request profile deletion2 parameters

get events8 parameters

create event2 parameters

get event7 parameters

get event metric4 parameters

get event profile5 parameters

get event relationships metric3 parameters

get event relationships profile3 parameters

get flows9 parameters

get flow7 parameters

update flow status4 parameters

get flow action7 parameters

get flow message7 parameters

get flow flow actions8 parameters

get flow relationships flow actions6 parameters

get flow relationships tags3 parameters

get flow tags4 parameters

get flow for flow action4 parameters

get flow action relationships flow3 parameters

get flow action messages7 parameters

get flow action relationships messages7 parameters

get flow action for message4 parameters

get flow message relationships action3 parameters

get flow message relationships template3 parameters

get flow message template4 parameters

get lists6 parameters

create list2 parameters

get list7 parameters

update list4 parameters

delete list3 parameters

get list relationships tags3 parameters

get list tags4 parameters

get list relationships profiles4 parameters

add profile to list4 parameters

remove profile from list3 parameters

get list profiles8 parameters

get metrics4 parameters

get metric4 parameters

query metric aggregates2 parameters

get profiles7 parameters

create profile2 parameters

get profile8 parameters

update profile4 parameters

suppress profiles2 parameters

unsuppress profiles2 parameters

subscribe profiles2 parameters

unsubscribe profiles2 parameters

create or update push token2 parameters

get profile lists4 parameters

get profile relationships lists3 parameters

get profile segments4 parameters

get profile relationships segments3 parameters

get segments6 parameters

get segment7 parameters

update segment4 parameters

get segment relationships tags3 parameters

get segment tags4 parameters

get segment relationships profiles4 parameters

get segment profiles8 parameters

get tags7 parameters

create tag2 parameters

get tag6 parameters

update tag4 parameters

delete tag3 parameters

get tag groups5 parameters

create tag group2 parameters

get tag group4 parameters

update tag group4 parameters

delete tag group3 parameters

get tag relationships flows3 parameters

create tag relationships flows4 parameters

delete tag relationships flows3 parameters

get tag relationships campaigns3 parameters

create tag relationships campaigns4 parameters

delete tag relationships campaigns3 parameters

get tag relationships lists3 parameters

create tag relationships lists4 parameters

delete tag relationships lists3 parameters

get tag relationships segments3 parameters

create tag relationships segments4 parameters

delete tag relationships segments3 parameters

get tag relationships tag group3 parameters

get tag group relationships tags3 parameters

get tag tag group4 parameters

get tag group tags4 parameters

get templates5 parameters

create template2 parameters

get template4 parameters

update template4 parameters

delete template3 parameters

create template render2 parameters

create template clone2 parameters

create client subscription3 parameters

create or update client push token3 parameters

unregister client push token3 parameters

create client event3 parameters

create or update client profile3 parameters

bulk create client events3 parameters

create client back in stock subscription3 parameters

The modern Unified API platform, built differently

Real-time, pass-through

Every request hits the source API live. No caching, no sync jobs, no stale data — just on-demand API reads/writes with native and virtual webhooks for instant updates.

Zero-storage by design

We never store end-customer data. Traffic is stateless and regionalized (US/EU/AU), reducing compliance scope and eliminating data-at-rest risk.

One API, deeply normalized

370+ integrations, 23 categories... Unified objects, endpoints, scopes, and errors—plus raw payload passthrough when you need provider-specific fields.

Custom fields & objects

Go beyond shallow schemas. We support custom fields and read/write on custom objects (e.g., Salesforce) via unified metadata APIs.

AI-ready integrations

Built for AI products: real-time streams for RAG/embeddings and Unified MCP tools that securely grant LLMs controlled integration access.

Predictable pricing, no lock-in

Transparent usage-based pricing that scales with API volume—not customers. Own your credentials and migrate anytime.

Add a Klaviyo integration to your application in hours

1Test drive integrations

Effortlessly test API calls, explore endpoints, and try out the Klaviyo integration using synthetic data in our Sandbox environment.

2Authorize connections

Drop in our Authorization component with a single line of code. Your users can then connect and grant access to their Klaviyo data.

3Start making API calls

Use the Connection ID to interact with Klaviyo via our unified API. We handle maintenance and updates so you can focus on your product.

Seamless Auth, no extra work

Unified.to removes the complexity of authentication and authorization so you can focus on building your product, not managing auth flows. Our pre-built UI and flexible API handle everything in the background—no extra setup required.

See documentation

React

React component React component source code

Trusted by global product companies and developers to power integrations for innovative AI and SaaS applications

5 stars on G2

Integrate with all the major marketing applications

Unified.to makes it possible to integrate once to a unified API to connect with all the applications your customers use, so you can train AI models, build advanced automation, and expand your market.

Start testing for free