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 Notification, Email, SMS, and Push.

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 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.4/100 thin ▬ flat Agent 31/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
1 APIs
NotificationEmailSMSPush

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 35.4/100 · thin
Contract Quality 12.8 / 19
Developer Ergonomics 3.6 / 15
Access Clarity 3.2 / 15
Operational Transparency 0.8 / 10
Contract Governance 1.2 / 9
Discoverability 3.8 / 8
Regulatory Posture 3.5 / 15
Create-or-Update Ergonomics 3.3 / 10
Agent readiness — 31/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 6 / 6
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
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Telecommunications regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. 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. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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 23

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

API Collection

OPEN COLLECTION

Courier Audiences API

OPEN COLLECTION

Courier Audiences Audit Events API

OPEN COLLECTION

Courier Audiences Authentication API

OPEN COLLECTION

Courier Audiences Automations API

OPEN COLLECTION

Courier Audiences Brands API

OPEN COLLECTION

Courier Audiences Bulk API

OPEN COLLECTION

Courier Audiences Courier Create API

OPEN COLLECTION

Courier Audiences Device Tokens API

OPEN COLLECTION

Courier Audiences Inbound API

OPEN COLLECTION

Courier Audiences Journeys API

OPEN COLLECTION

Courier Audiences Lists API

OPEN COLLECTION

Courier Audiences Notification Templates API

OPEN COLLECTION

Courier Audiences Providers API

OPEN COLLECTION

Courier Audiences Routing Strategies API

OPEN COLLECTION

Courier Audiences Send API

OPEN COLLECTION

Courier Audiences Sent Messages API

OPEN COLLECTION

Courier Audiences Tenants API

OPEN COLLECTION

Courier Audiences Translations API

OPEN COLLECTION

Courier Audiences User Preferences API

OPEN COLLECTION

Courier Audiences User Profiles API

OPEN COLLECTION

Courier Audiences User Tenants API

OPEN COLLECTION

Courier

OPEN COLLECTION

Scroll for all 23

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

Other 1

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap

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.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/courier.png
tags:
- Notification
- Email
- SMS
- Push
tags_raw:
- Notifications
- Email
- SMS
- Push
- API
created: '2026-05-08'
modified: '2026-05-29'
specificationVersion: '0.23'
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
  - Event
  tags_raw:
  - 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:
  - List
  tags_raw:
  - 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: CapabilityMap
  url: capabilities/courier-capability-edges.yml
  name: Courier Business Capability Map
- 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

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