Courier website screenshot

Courier

Courier is a multi-channel notification API offering routing across email, SMS, push, chat, and in-app, with templates, preferences, and a no-code studio.

Courier publishes 22 APIs on the APIs.io network, including Inbox Real-Time API, Audiences API, Audit Events API, and 19 more. Tagged areas include Notifications, Email, SMS, Push, and API.

The Courier catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Courier’s developer surface includes authentication, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
40.1/100 thin ▼ -5.4 Agent 46/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessSelf serve
22 APIs
NotificationsEmailSMSPushAPI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 40.1/100 · thin
Contract Quality 17.4 / 25
Developer Ergonomics 2.6 / 20
Commercial Clarity 7.4 / 20
Operational Transparency 3.4 / 13
Governance 5.7 / 12
Discoverability 6.5 / 10
Agent readiness — 46/100 · 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 8 / 8
Request/Response Examples 7 / 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/courier: 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 22

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

Courier Inbox Real-Time API

WebSocket service that delivers Inbox messages and message-state events (read, unread, opened, archived, clicked, mark-all-read, archive-all, archive-read) to authenticated user...

Courier Audiences API

The Audiences API from Courier — 3 operation(s) for audiences.

Courier Audit Events API

The Audit Events API from Courier — 2 operation(s) for audit events.

Courier Authentication API

The Authentication API from Courier — 1 operation(s) for authentication.

Courier Automations API

The Automations API from Courier — 3 operation(s) for automations.

Courier Brands API

The Brands API from Courier — 2 operation(s) for brands.

Courier Bulk API

The Bulk API from Courier — 4 operation(s) for bulk.

Courier Courier Create API

The Courier Create API from Courier — 4 operation(s) for courier create.

Courier Device Tokens API

The Device Tokens API from Courier — 2 operation(s) for device tokens.

Courier Inbound API

The Inbound API from Courier — 1 operation(s) for inbound.

Courier Journeys API

The Journeys API from Courier — 2 operation(s) for journeys.

Courier Lists API

The Lists API from Courier — 5 operation(s) for lists.

Courier Notification Templates API

The Notification Templates API from Courier — 8 operation(s) for notification templates.

Courier Providers API

The Providers API from Courier — 3 operation(s) for providers.

Courier Routing Strategies API

The Routing Strategies API from Courier — 3 operation(s) for routing strategies.

Courier Send API

The Send API from Courier — 1 operation(s) for send.

Courier Sent Messages API

The Sent Messages API from Courier — 6 operation(s) for sent messages.

Courier Tenants API

The Tenants API from Courier — 4 operation(s) for tenants.

Courier Translations API

The Translations API from Courier — 1 operation(s) for translations.

Courier User Preferences API

The User Preferences API from Courier — 2 operation(s) for user preferences.

Courier User Profiles API

The User Profiles API from Courier — 2 operation(s) for user profiles.

Courier User Tenants API

The User Tenants API from Courier — 2 operation(s) for user tenants.

Scroll for all 22

Open Collections 1

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

Courier

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Courier GraphQL API

Courier provides a native GraphQL API in addition to its REST API. The GraphQL endpoint is available at `https://api.courier.com/graphql` and supports querying and mutating noti...

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Courier Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Courier Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Courier Finops

FINOPS

Event Specifications 1

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

Courier Inbox Real-Time API

AsyncAPI definition for Courier's Inbox WebSocket service used by the Courier client SDKs (JS, React, React Native, iOS, Android, Flutter, Web Components) to receive real-time, ...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Courier API Rules

9 rules · 1 errors 7 warnings 1 info

SPECTRAL

Security Posture 3

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

Courier Authentication

http · 1 scheme

SECURITY

Courier Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Courier Trust Center

SOC 2, PCI DSS, HIPAA, GDPR

SECURITY

Agentic Access 1

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

Courier Agentic Access

103 operations · 60 acting

103 operations · 60 acting

AGENTIC

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: courier
url: https://raw.githubusercontent.com/api-evangelist/courier/refs/heads/main/apis.yml
name: Courier
kind: company
description: Courier is a multi-channel notification API offering routing across email, SMS, push, chat, and in-app, with
  templates, preferences, and a no-code studio.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: 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/courier.png
tags:
- Notifications
- Email
- SMS
- Push
- API
created: '2026-05-08'
modified: '2026-05-29'
specificationVersion: '0.19'
apis:
- name: Courier Inbox Real-Time API
  description: WebSocket service that delivers Inbox messages and message-state events (read, unread, opened, archived, clicked,
    mark-all-read, archive-all, archive-read) to authenticated users in real time.
  humanURL: https://www.courier.com/docs/platform/inbox/inbox-overview
  baseURL: wss://realtime.courier.io
  tags:
  - Inbox
  - WebSocket
  - Real-Time
  - Events
  properties:
  - type: Documentation
    url: https://www.courier.com/docs/platform/inbox/inbox-overview
  - type: Documentation
    url: https://www.courier.com/docs/sdk-libraries/courier-js-web
  - type: AsyncAPI
    url: asyncapi/courier-asyncapi.yml
- aid: courier:courier-audiences-api
  name: Courier Audiences API
  description: The Audiences API from Courier — 3 operation(s) for audiences.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Audiences
  properties:
  - type: OpenAPI
    url: openapi/courier-audiences-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-audit-events-api
  name: Courier Audit Events API
  description: The Audit Events API from Courier — 2 operation(s) for audit events.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Audit Events
  properties:
  - type: OpenAPI
    url: openapi/courier-audit-events-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-authentication-api
  name: Courier Authentication API
  description: The Authentication API from Courier — 1 operation(s) for authentication.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/courier-authentication-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-automations-api
  name: Courier Automations API
  description: The Automations API from Courier — 3 operation(s) for automations.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Automations
  properties:
  - type: OpenAPI
    url: openapi/courier-automations-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-brands-api
  name: Courier Brands API
  description: The Brands API from Courier — 2 operation(s) for brands.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Brands
  properties:
  - type: OpenAPI
    url: openapi/courier-brands-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-bulk-api
  name: Courier Bulk API
  description: The Bulk API from Courier — 4 operation(s) for bulk.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Bulk
  properties:
  - type: OpenAPI
    url: openapi/courier-bulk-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-courier-create-api
  name: Courier Courier Create API
  description: The Courier Create API from Courier — 4 operation(s) for courier create.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Courier Create
  properties:
  - type: OpenAPI
    url: openapi/courier-courier-create-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-device-tokens-api
  name: Courier Device Tokens API
  description: The Device Tokens API from Courier — 2 operation(s) for device tokens.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Device Tokens
  properties:
  - type: OpenAPI
    url: openapi/courier-device-tokens-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-inbound-api
  name: Courier Inbound API
  description: The Inbound API from Courier — 1 operation(s) for inbound.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Inbound
  properties:
  - type: OpenAPI
    url: openapi/courier-inbound-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-journeys-api
  name: Courier Journeys API
  description: The Journeys API from Courier — 2 operation(s) for journeys.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Journeys
  properties:
  - type: OpenAPI
    url: openapi/courier-journeys-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-lists-api
  name: Courier Lists API
  description: The Lists API from Courier — 5 operation(s) for lists.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Lists
  properties:
  - type: OpenAPI
    url: openapi/courier-lists-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-notification-templates-api
  name: Courier Notification Templates API
  description: The Notification Templates API from Courier — 8 operation(s) for notification templates.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Notification Templates
  properties:
  - type: OpenAPI
    url: openapi/courier-notification-templates-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-providers-api
  name: Courier Providers API
  description: The Providers API from Courier — 3 operation(s) for providers.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Providers
  properties:
  - type: OpenAPI
    url: openapi/courier-providers-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-routing-strategies-api
  name: Courier Routing Strategies API
  description: The Routing Strategies API from Courier — 3 operation(s) for routing strategies.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Routing Strategies
  properties:
  - type: OpenAPI
    url: openapi/courier-routing-strategies-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-send-api
  name: Courier Send API
  description: The Send API from Courier — 1 operation(s) for send.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Send
  properties:
  - type: OpenAPI
    url: openapi/courier-send-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-sent-messages-api
  name: Courier Sent Messages API
  description: The Sent Messages API from Courier — 6 operation(s) for sent messages.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Sent Messages
  properties:
  - type: OpenAPI
    url: openapi/courier-sent-messages-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-tenants-api
  name: Courier Tenants API
  description: The Tenants API from Courier — 4 operation(s) for tenants.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Tenants
  properties:
  - type: OpenAPI
    url: openapi/courier-tenants-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-translations-api
  name: Courier Translations API
  description: The Translations API from Courier — 1 operation(s) for translations.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - Translations
  properties:
  - type: OpenAPI
    url: openapi/courier-translations-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-user-preferences-api
  name: Courier User Preferences API
  description: The User Preferences API from Courier — 2 operation(s) for user preferences.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - User Preferences
  properties:
  - type: OpenAPI
    url: openapi/courier-user-preferences-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-user-profiles-api
  name: Courier User Profiles API
  description: The User Profiles API from Courier — 2 operation(s) for user profiles.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - User Profiles
  properties:
  - type: OpenAPI
    url: openapi/courier-user-profiles-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
- aid: courier:courier-user-tenants-api
  name: Courier User Tenants API
  description: The User Tenants API from Courier — 2 operation(s) for user tenants.
  humanURL: https://www.courier.com/docs/reference
  baseURL: https://api.courier.com
  tags:
  - User Tenants
  properties:
  - type: OpenAPI
    url: openapi/courier-user-tenants-api-openapi.yml
  - type: Documentation
    url: https://www.courier.com/docs/reference
  - type: GraphQL
    url: graphql/courier-graphql.md
common:
- type: AgenticAccess
  url: agentic-access/courier-agentic-access.yml
- type: TrustCenter
  url: security/courier-trust-center.yml
- type: DomainSecurity
  url: security/courier-domain-security.yml
- type: Authentication
  url: authentication/courier-authentication.yml
- type: GitHubOrganization
  url: https://github.com/trycourier
- type: LinkedIn
  url: https://www.linkedin.com/company/trycourier
- type: Website
  url: https://www.courier.com/
- type: Plans
  url: plans/courier-plans-pricing.yml
- type: RateLimits
  url: rate-limits/courier-rate-limits.yml
- type: FinOps
  url: finops/courier-finops.yml
- url: https://www.courier.com/blog/feed
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com