Customer.ioAPIintegration&MCPserver

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

Add Customer.io to your app See feature support

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Add Customer.io 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 Member

MARTECH List

Passthrough

MARTECH Member

MARTECH List

Passthrough

Your customer's data

on Customer.io

Unified API data-models and methods

MARTECH Member

list get

MARTECH List

list get

Passthrough

get post put patch delete

119 Unified MCP tools

list all lists3 parameters

retrieve a list2 parameters

list all members4 parameters

retrieve a member2 parameters

trigger a broadcast2 parameters

get broadcast error descriptions6 parameters

send a transactional email

send a transactional push17 parameters

send a transactional sms10 parameters

list campaigns

get a campaign2 parameters

get campaign metrics10 parameters

get campaign link metrics5 parameters

list campaign actions3 parameters

get campaign message metadata9 parameters

get a campaign action4 parameters

update a campaign action4 parameters

get a translation of a campaign message6 parameters

update a translation of a campaign message6 parameters

get campaign action metrics12 parameters

get link metrics for an action7 parameters

get campaign journey metrics5 parameters

list activities7 parameters

list broadcasts

get a broadcast2 parameters

get the status of a broadcast4 parameters

get broadcast metrics5 parameters

get broadcast link metrics5 parameters

list broadcast actions2 parameters

get messages for a broadcast9 parameters

get a broadcast action4 parameters

update a broadcast action4 parameters

get a translation of a broadcast message6 parameters

update a translation of a broadcast message6 parameters

get broadcast action metrics7 parameters

get broadcast action link metrics7 parameters

get broadcast triggers2 parameters

add or update attributes 1 parameter

add or update events 1 parameter

look up an esp-suppressed address2 parameters

get esp-suppressed emails by type4 parameters

un-suppress an esp-suppressed address4 parameters

suppress an email at the esp4 parameters

list exports

get an export2 parameters

download an export2 parameters

export customer data 1 parameter

export information about deliveries

import items in bulk 1 parameter

retrieve a bulk import2 parameters

list ip addresses

list messages10 parameters

get a message2 parameters

get an archived message2 parameters

list newsletters3 parameters

get a newsletter2 parameters

delete a newsletter2 parameters

get newsletter metrics5 parameters

get newsletter link metrics5 parameters

list newsletter variants2 parameters

get newsletter message metadata7 parameters

get a newsletter variant4 parameters

update a newsletter variant24 parameters

get a translation of a newsletter variant4 parameters

update a translation of a newsletter variant24 parameters

list a/b test groups in a newsletter2 parameters

get a translation in a newsletter test group6 parameters

update a translation in a newsletter test group26 parameters

get metrics for a variant7 parameters

get newsletter variant link metrics7 parameters

list object types

find objects4 parameters

get object relationships7 parameters

get object attributes5 parameters

create a reporting webhook7 parameters

list reporting webhooks

get a reporting webhook2 parameters

update a webhook configuration9 parameters

delete a reporting webhook2 parameters

create a manual segment 1 parameter

list segments

get a segment2 parameters

delete a segment2 parameters

get a segment's dependencies2 parameters

get a segment customer count2 parameters

list customers in a segment4 parameters

list sender identities3 parameters

get a sender2 parameters

get sender usage data2 parameters

list snippets

create or update snippets3 parameters

delete a snippet2 parameters

list subscription topics

list transactional messages

get a transactional message2 parameters

list all variants of a transactional message2 parameters

update a transactional message23 parameters

get a translation of a transactional message4 parameters

update a translation of a transactional message23 parameters

get transactional message metrics4 parameters

get transactional message link metrics5 parameters

get transactional message deliveries8 parameters

list workspaces

create a collection

list your collections

lookup a collection2 parameters

delete a collection2 parameters

update a collection2 parameters

lookup collection contents2 parameters

update the contents of a collection2 parameters

get customers by email 1 parameter

search for customers3 parameters

lookup a customer's attributes3 parameters

lookup a customer's relationships4 parameters

list customers, attributes, and devices 1 parameter

lookup a customer's segments3 parameters

lookup messages sent to a customer7 parameters

lookup a customer's activities7 parameters

lookup a customer's subscription preferences5 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

360+ integrations, 22 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 Customer.io integration to your application in hours

1Test drive integrations

Effortlessly test API calls, explore endpoints, and try out the Customer.io 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 Customer.io data.

3Start making API calls

Use the Connection ID to interact with Customer.io 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

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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