Customer.io website screenshot

Customer.io

Customer.io is a customer engagement platform that combines a customer data platform, marketing automation, and messaging delivery to send behavior-triggered email, push, SMS, and in-app messages. Its API surface includes the Track API for sending behavioral data and customer profile updates, the App API for managing workspace resources and sending transactional and broadcast messages, the Pipelines API which is a Segment-spec data ingestion interface, and outbound reporting webhooks that deliver message lifecycle events.

Customer.io publishes 23 APIs on the APIs.io network, including Track API, Activities API, Alias API, and 20 more. Tagged areas include Behavioral Data, Broadcasts, Campaigns, CDP, and Customer Data.

The Customer.io catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 3 Spectral governance rulesets.

Customer.io’s developer surface includes authentication, documentation, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub
50.3/100 developing ▼ -5.3 Agent 36/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessPaidSelf serve
23 APIs
Behavioral DataBroadcastsCampaignsCDPCustomer DataCustomer Data PlatformData IngestionEmailEvent TrackingMarketing AutomationMessagingPush NotificationsSegmentsSMSTransactional Email

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 50.3/100 · developing
Contract Quality 20.5 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 9.5 / 20
Operational Transparency 4.8 / 13
Governance 6.3 / 12
Discoverability 7.4 / 10
Agent readiness — 36/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/customer-io: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 23

Individual APIs this provider publishes, each with its own machine-readable definition.

Customer.io Track API

The Customer.io Track API allows developers to send behavioral data and customer profile information into Customer.io. It provides endpoints for identifying customers, tracking ...

Customer.io Activities API

Retrieve activity logs for your workspace.

Customer.io Alias API

Merge two user identities by creating an alias linking a new identity to an existing one.

Customer.io Batch API

Send multiple API calls in a single request for improved performance.

Customer.io Broadcasts API

Trigger API-triggered broadcasts to send messages to groups of people based on segments or filters.

Customer.io Campaigns API

Retrieve information about campaigns, campaign actions, and campaign metrics in your workspace.

Customer.io Collections API

Manage collections of data used in message personalization.

Customer.io Customers API

Look up customer profiles, search for customers, and retrieve customer attributes and activity data.

Customer.io Devices API

Manage push notification devices associated with customer profiles.

Customer.io Entity API

Track API v2 entity endpoint for creating and managing people and objects using a unified request format.

Customer.io Events API

Track customer events and anonymous events to record behavioral data and trigger messaging workflows.

Customer.io Exports API

Export customer data, deliveries, and other information from your workspace.

Customer.io Group API

Associate people with groups or organizations.

Customer.io Identify API

Identify people and set their profile attributes. The identify call tells Customer.io who the current user is and assigns traits to them.

Customer.io Merge API

Merge two customer profiles into a single profile.

Customer.io Messages API

Retrieve information about individual messages sent to customers.

Customer.io Newsletters API

Retrieve information about newsletters and newsletter variants.

Customer.io Page API

Record page views from web applications.

Customer.io Screen API

Record screen views from mobile applications.

Customer.io Segments API

Create and manage manual segments, and retrieve segment membership information.

Customer.io Sender Identities API

Manage sender identities used for sending messages.

Customer.io Snippets API

Manage reusable content snippets for use in messages.

Customer.io Transactional API

Send transactional messages such as password resets, purchase receipts, and other important notifications triggered by user actions.

Scroll for all 23

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Customer.io App API

OPEN COLLECTION

Customer.io Pipelines API

OPEN COLLECTION

Customer.io Track API

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Customer.io GraphQL Schema

This conceptual GraphQL schema represents the Customer.io messaging and marketing automation platform. Customer.io provides APIs for tracking behavioral data, managing customer ...

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Customer Io Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Customer Io Rate Limits

4 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Customer Io Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Customer.io Reporting Webhooks

Customer.io Reporting Webhooks send real-time message activity events as JSON payloads via HTTP POST to a configured endpoint. These events include message sends, deliveries, op...

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Customer Io Context

0 classes · 11 properties

JSON-LD

Spectral Rules 3

Spectral governance rulesets for linting and validating these APIs.

Customer.io API Rules

8 rules · 1 errors 7 warnings

SPECTRAL

Customer.io API Rules

6 rules · 5 warnings 1 info

SPECTRAL

Customer.io API Rules

6 rules · 3 errors 3 warnings

SPECTRAL

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

Customer.io Customer

8 properties

JSON SCHEMA

Customer.io Event

7 properties

JSON SCHEMA

Customer.io Reporting Webhook Payload

4 properties

JSON SCHEMA

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Customer Io Authentication

http · 2 schemes

SECURITY

Customer Io Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Customer Io Vulnerability Disclosure

disclosure policy published

SECURITY

Customer Io Trust Center

SOC 2, ISO 27001, HIPAA, GDPR

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Customer Io Agentic Access

52 operations · 29 acting

52 operations · 29 acting

AGENTIC

Resources

Documentation 5

Reference material describing how the API behaves

Documentation
Documentation
 AsyncAPI
AsyncAPI
 JSONSchema
JSONSchema
 JSONSchema
JSONSchema
 JSONSchema
JSONSchema

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

JSONLD
JSONLD
 Vocabulary
Vocabulary
 Rules
Rules

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Other 1

Properties that don't map to a standard resource type

Capabilities
Capabilities

Source (apis.yml)

apis.yml Raw ↑ 
aid: customer-io
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/customer-io.png
url: https://raw.githubusercontent.com/api-evangelist/customer-io/refs/heads/main/apis.yml
apis:
- aid: customer-io:track-api
  name: Customer.io Track API
  tags:
  - Behavioral Data
  - Customer Data
  - Event Tracking
  - Marketing Automation
  - Messaging
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://track.customer.io
  humanURL: https://docs.customer.io/integrations/api/track/
  properties:
  - url: https://docs.customer.io/integrations/api/track/
    type: Documentation
  - url: openapi/customer-io-track-api-openapi.yml
    type: OpenAPI
  - url: graphql/customer-io-graphql.md
    type: GraphQL
  description: The Customer.io Track API allows developers to send behavioral data and customer profile information into Customer.io.
    It provides endpoints for identifying customers, tracking events, managing devices for push notifications, and sending
    anonymous events. The API uses basic authentication with a Site ID and API key, and accepts JSON request bodies.
- aid: customer-io:customer-io-activities-api
  name: Customer.io Activities API
  description: Retrieve activity logs for your workspace.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Activities
  properties:
  - type: OpenAPI
    url: openapi/customer-io-activities-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-alias-api
  name: Customer.io Alias API
  description: Merge two user identities by creating an alias linking a new identity to an existing one.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Alias
  properties:
  - type: OpenAPI
    url: openapi/customer-io-alias-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-batch-api
  name: Customer.io Batch API
  description: Send multiple API calls in a single request for improved performance.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Batch
  properties:
  - type: OpenAPI
    url: openapi/customer-io-batch-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-broadcasts-api
  name: Customer.io Broadcasts API
  description: Trigger API-triggered broadcasts to send messages to groups of people based on segments or filters.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Broadcasts
  properties:
  - type: OpenAPI
    url: openapi/customer-io-broadcasts-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-campaigns-api
  name: Customer.io Campaigns API
  description: Retrieve information about campaigns, campaign actions, and campaign metrics in your workspace.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Campaigns
  properties:
  - type: OpenAPI
    url: openapi/customer-io-campaigns-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-collections-api
  name: Customer.io Collections API
  description: Manage collections of data used in message personalization.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Collections
  properties:
  - type: OpenAPI
    url: openapi/customer-io-collections-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-customers-api
  name: Customer.io Customers API
  description: Look up customer profiles, search for customers, and retrieve customer attributes and activity data.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/customer-io-customers-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-devices-api
  name: Customer.io Devices API
  description: Manage push notification devices associated with customer profiles.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Devices
  properties:
  - type: OpenAPI
    url: openapi/customer-io-devices-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-entity-api
  name: Customer.io Entity API
  description: Track API v2 entity endpoint for creating and managing people and objects using a unified request format.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Entity
  properties:
  - type: OpenAPI
    url: openapi/customer-io-entity-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-events-api
  name: Customer.io Events API
  description: Track customer events and anonymous events to record behavioral data and trigger messaging workflows.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/customer-io-events-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-exports-api
  name: Customer.io Exports API
  description: Export customer data, deliveries, and other information from your workspace.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Exports
  properties:
  - type: OpenAPI
    url: openapi/customer-io-exports-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-group-api
  name: Customer.io Group API
  description: Associate people with groups or organizations.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Group
  properties:
  - type: OpenAPI
    url: openapi/customer-io-group-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-identify-api
  name: Customer.io Identify API
  description: Identify people and set their profile attributes. The identify call tells Customer.io who the current user
    is and assigns traits to them.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Identify
  properties:
  - type: OpenAPI
    url: openapi/customer-io-identify-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-merge-api
  name: Customer.io Merge API
  description: Merge two customer profiles into a single profile.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Merge
  properties:
  - type: OpenAPI
    url: openapi/customer-io-merge-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-messages-api
  name: Customer.io Messages API
  description: Retrieve information about individual messages sent to customers.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/customer-io-messages-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-newsletters-api
  name: Customer.io Newsletters API
  description: Retrieve information about newsletters and newsletter variants.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Newsletters
  properties:
  - type: OpenAPI
    url: openapi/customer-io-newsletters-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-page-api
  name: Customer.io Page API
  description: Record page views from web applications.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Page
  properties:
  - type: OpenAPI
    url: openapi/customer-io-page-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-screen-api
  name: Customer.io Screen API
  description: Record screen views from mobile applications.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Screen
  properties:
  - type: OpenAPI
    url: openapi/customer-io-screen-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-segments-api
  name: Customer.io Segments API
  description: Create and manage manual segments, and retrieve segment membership information.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Segments
  properties:
  - type: OpenAPI
    url: openapi/customer-io-segments-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-sender-identities-api
  name: Customer.io Sender Identities API
  description: Manage sender identities used for sending messages.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Sender Identities
  properties:
  - type: OpenAPI
    url: openapi/customer-io-sender-identities-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-snippets-api
  name: Customer.io Snippets API
  description: Manage reusable content snippets for use in messages.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Snippets
  properties:
  - type: OpenAPI
    url: openapi/customer-io-snippets-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
- aid: customer-io:customer-io-transactional-api
  name: Customer.io Transactional API
  description: Send transactional messages such as password resets, purchase receipts, and other important notifications triggered
    by user actions.
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io
  tags:
  - Transactional
  properties:
  - type: OpenAPI
    url: openapi/customer-io-transactional-api-openapi.yml
  - type: Documentation
    url: https://docs.customer.io/integrations/api/app/
  - type: Documentation
    url: https://docs.customer.io/integrations/data-in/connections/http-api/
common:
- type: AgenticAccess
  url: agentic-access/customer-io-agentic-access.yml
- type: TrustCenter
  url: security/customer-io-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/customer-io-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/customer-io-domain-security.yml
- type: Authentication
  url: authentication/customer-io-authentication.yml
- type: GitHubOrganization
  url: https://github.com/customerio
- type: LinkedIn
  url: https://www.linkedin.com/company/customer-io
- type: Website
  url: https://customer.io
- type: Documentation
  url: https://docs.customer.io
- type: AsyncAPI
  url: asyncapi/customer-io-reporting-webhooks-asyncapi.yml
- type: JSONSchema
  url: json-schema/customer-io-customer-schema.json
- type: JSONSchema
  url: json-schema/customer-io-event-schema.json
- type: JSONSchema
  url: json-schema/customer-io-webhook-payload-schema.json
- type: JSONLD
  url: json-ld/customer-io-context.jsonld
- type: Vocabulary
  url: vocabulary/customer-io-vocabulary.yml
- type: Rules
  url: rules/customer-io-rules.yml
- type: Capabilities
  url: capabilities/customer-io-capabilities.yml
- type: Integrations
  url: https://customer.io/integrations
- type: LlmsText
  url: https://docs.customer.io/llms.txt
integrations:
- name: See all integrations See all integrations
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
specificationVersion: '0.20'
created: '2024-01-01'
modified: '2026-05-19'
name: Customer.io
tags:
- Behavioral Data
- Broadcasts
- Campaigns
- CDP
- Customer Data
- Customer Data Platform
- Data Ingestion
- Email
- Event Tracking
- Marketing Automation
- Messaging
- Push Notifications
- Segments
- SMS
- Transactional Email
description: Customer.io is a customer engagement platform that combines a customer data platform, marketing automation, and
  messaging delivery to send behavior-triggered email, push, SMS, and in-app messages. Its API surface includes the Track
  API for sending behavioral data and customer profile updates, the App API for managing workspace resources and sending transactional
  and broadcast messages, the Pipelines API which is a Segment-spec data ingestion interface, and outbound reporting webhooks
  that deliver message lifecycle events.