Customer.io

aid: customerio
url: https://raw.githubusercontent.com/api-evangelist/customerio/refs/heads/main/apis.yml
name: Customer.io
kind: company
description: Customer.io is a customer messaging and marketing automation platform.
  Its APIs let teams pipe behavioral data in, manage people and their attributes,
  trigger campaigns and broadcasts, send transactional email, push, SMS, and in-app
  messages, and stream delivery activity back out via reporting webhooks. The surface
  spans the Track API (basic site-id + api-key auth), the App / Transactional API
  (Bearer), and the Pipelines / Data Pipelines CDP API.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Customer Messaging
- Marketing Automation
- Email
- CDP
- Transactional
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: customerio:track-api
  name: Customer.io Track API
  tags:
  - Track
  - People
  - Events
  - Devices
  - Segments
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customer.io/integrations/api/track/
  baseURL: https://track.customer.io/api/v1
  properties:
  - url: https://docs.customer.io/integrations/api/track/
    type: Documentation
  - url: https://docs.customer.io/integrations/api/track/
    type: APIReference
  - url: openapi/customerio-openapi.yml
    type: OpenAPI
  - url: collections/customerio.postman_collection.json
    type: PostmanCollection
  description: Behavioral tracking API for adding and updating people, sending
    customer and anonymous events, registering device tokens, and managing manual
    segment membership. Authenticated with HTTP Basic using site_id and api_key.
    Includes v2 entity and batch endpoints.
- aid: customerio:app-transactional-api
  name: Customer.io App / Transactional API
  tags:
  - Transactional
  - Broadcasts
  - Customers
  - Campaigns
  - Exports
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customer.io/integrations/api/app/
  baseURL: https://api.customer.io
  properties:
  - url: https://docs.customer.io/integrations/api/app/
    type: Documentation
  - url: https://docs.customer.io/integrations/api/app/
    type: APIReference
  - url: openapi/customerio-openapi.yml
    type: OpenAPI
  - url: collections/customerio.postman_collection.json
    type: PostmanCollection
  description: App API for sending transactional email, push, SMS, and in-app
    messages, triggering API-driven broadcasts, searching people, reading
    segments, campaigns and their metrics, listing messages, running exports,
    and managing collections. Authenticated with an App API key as a Bearer
    token.
- aid: customerio:pipelines-cdp-api
  name: Customer.io Pipelines / Data Pipelines CDP API
  tags:
  - CDP
  - Pipelines
  - Identify
  - Track
  - Batch
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customer.io/integrations/api/cdp/
  baseURL: https://cdp.customer.io/v1
  properties:
  - url: https://docs.customer.io/integrations/api/cdp/
    type: Documentation
  - url: https://docs.customer.io/integrations/api/cdp/
    type: APIReference
  - url: openapi/customerio-openapi.yml
    type: OpenAPI
  - url: collections/customerio.postman_collection.json
    type: PostmanCollection
  description: Segment-compatible customer data pipeline API with identify,
    track, page, screen, group, alias, and batch calls. Routes first-party
    behavioral and identity data into Customer.io and onward to destinations.
    Authenticated with a source write key as a Bearer token.
- aid: customerio:reporting-api
  name: Customer.io Reporting API
  tags:
  - Reporting
  - Metrics
  - Analytics
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customer.io/integrations/api/app/
  baseURL: https://api.customer.io
  properties:
  - url: https://docs.customer.io/integrations/api/app/
    type: Documentation
  - url: https://docs.customer.io/integrations/api/app/
    type: APIReference
  - url: openapi/customerio-openapi.yml
    type: OpenAPI
  description: App API endpoints that return message activity and metrics -
    per-campaign metrics, customer message history, and sent message listings -
    for analyzing messaging performance. Authenticated with an App API key as a
    Bearer token.
- aid: customerio:reporting-webhooks
  name: Customer.io Reporting Webhooks
  tags:
  - Webhooks
  - Events
  - Reporting
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.customer.io/integrations/api/webhooks/
  baseURL: https://docs.customer.io/integrations/api/webhooks/
  properties:
  - url: https://docs.customer.io/integrations/api/webhooks/
    type: Documentation
  - url: https://docs.customer.io/integrations/data-out/connections/webhooks/
    type: APIReference
  description: Outbound reporting webhooks that POST real-time message activity
    events (email/sms/push/in-app delivered, opened, clicked, bounced, converted,
    unsubscribed, and more) as JSON to a customer-supplied HTTPS endpoint.
common:
- 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: Plans
  url: plans/customerio-plans-pricing.yml
- type: RateLimits
  url: rate-limits/customerio-rate-limits.yml
- type: FinOps
  url: finops/customerio-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com