Knock

Knock is a notification infrastructure platform with workflows, channels (email, SMS, push, in-app), preferences, and digests. Stripe-style API for sending and orchestrating multi-channel notifications.

Knock publishes 16 APIs on the APIs.io network, including Audiences API, Bulk operations API, Channel data API, and 13 more. Tagged areas include Notification, Email, SMS, Push, and Workflows.

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

Knock’s developer surface includes authentication and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

30.9/100 thin ▬ flat Agent 25/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Notification Email SMS Push Workflows

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 30.9/100 · thin

Contract Quality 11.7 / 19

Developer Ergonomics 3.2 / 15

Access Clarity 2.0 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.0 / 9

Discoverability 5.7 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 1.1 / 10

Agent readiness — 25/100 · agent aware

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 0 / 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/knock: 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 16

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

Knock Audiences API

An Audience is a segment of users.

Knock Bulk operations API

A bulk operation is a set of changes applied across zero or more records triggered via a call to the Knock API and performed asynchronously.

Knock Channel data API

Channel data is data that is specific to a recipient and a channel, like push tokens, or one or more Slack connections.

Knock Feeds API

The Feeds API from Knock — 2 operation(s) for feeds.

Knock Guides API

The Guides API from Knock — 8 operation(s) for guides.

Knock Integrations API

The Integrations API from Knock — 2 operation(s) for integrations.

Knock Messages API

A message sent to a single recipient on a channel.

Knock Objects API

An object represents a resource in your system that you want to map into Knock.

Knock Providers API

A provider represents a third-party service that Knock integrates with and is configured via a channel.

Knock Schedules API

A schedule is a per-recipient, timezone-aware configuration for when to invoke a workflow.

Knock Subscriptions API

A subscription represents a connection between a recipient and an object, used to represent a list.

Knock Tenants API

A tenant represents a top-level entity from your system, like a company, organization, account, or workspace.

Knock Users API

A user is an individual from your system, represented in Knock. They are most commonly a recipient of a notification.

Knock Workflow recipient runs API

A workflow run represents an individual execution of a workflow for a specific recipient.

Knock Workflow Triggers API

Operations for triggering and canceling workflow executions.

Knock Workflows API

A workflow is a structured set of steps that is triggered to produce notifications sent over channels.

Scroll for all 16

Open Collections 21

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

API Collection

OPEN COLLECTION

Knock Audiences API

OPEN COLLECTION

Knock Audiences Bulk operations API

OPEN COLLECTION

Knock Audiences Channel data API

OPEN COLLECTION

Knock Audiences Feeds API

OPEN COLLECTION

Knock Audiences Guides API

OPEN COLLECTION

Knock Audiences Integrations API

OPEN COLLECTION

Knock Audiences Messages API

OPEN COLLECTION

Knock Audiences Microsoft Teams API

OPEN COLLECTION

Knock Audiences Objects API

OPEN COLLECTION

Knock Audiences Preferences API

OPEN COLLECTION

Knock Audiences Providers API

OPEN COLLECTION

Knock Audiences Schedules API

OPEN COLLECTION

Knock Audiences Slack API

OPEN COLLECTION

Knock Audiences Subscriptions API

OPEN COLLECTION

Knock Audiences Tenants API

OPEN COLLECTION

Knock Audiences Users API

OPEN COLLECTION

Knock Audiences Workflow recipient runs API

OPEN COLLECTION

Knock Audiences Workflow Triggers API

OPEN COLLECTION

Knock Audiences Workflows API

OPEN COLLECTION

Knock API

OPEN COLLECTION

Scroll for all 21

Pricing Plans 1

Published pricing tiers and plan structures.

Knock Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Knock Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Knock Finops

FINOPS

Event Specifications 1

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

Knock Real-Time In-App Feed (Phoenix Channels)

AsyncAPI specification for Knock's real-time in-app notification feed transport. Knock exposes a Phoenix Channels WebSocket that pushes feed updates to subscribed clients. The c...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Knock API Rules

8 rules · 1 errors 7 warnings

SPECTRAL

Security Posture 2

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

Knock Authentication

http · 1 scheme

SECURITY

Knock Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Knock Agentic Access

116 operations · 78 acting · 3 human-in-the-loop

116 operations · 78 acting

AGENTIC

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

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 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: knock
url: https://raw.githubusercontent.com/api-evangelist/knock/refs/heads/main/apis.yml
name: Knock
kind: company
description: Knock is a notification infrastructure platform with workflows, channels (email, SMS, push, in-app), preferences,
  and digests. Stripe-style API for sending and orchestrating multi-channel notifications.
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/knock.png
tags:
- Notification
- Email
- SMS
- Push
- Workflows
tags_raw:
- Notifications
- Email
- SMS
- Push
- Workflows
created: '2026-05-08'
modified: '2026-05-29'
specificationVersion: '0.23'
apis:
- aid: knock:knock-audiences-api
  name: Knock Audiences API
  description: An Audience is a segment of users.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Audiences
  properties:
  - type: OpenAPI
    url: openapi/knock-audiences-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-bulk-operations-api
  name: Knock Bulk operations API
  description: A bulk operation is a set of changes applied across zero or more records triggered via a call to the Knock
    API and performed asynchronously.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Bulk Operations
  tags_raw:
  - Bulk operations
  properties:
  - type: OpenAPI
    url: openapi/knock-bulk-operations-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-channel-data-api
  name: Knock Channel data API
  description: Channel data is data that is specific to a recipient and a channel, like push tokens, or one or more Slack
    connections.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Channel data
  properties:
  - type: OpenAPI
    url: openapi/knock-channel-data-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-feeds-api
  name: Knock Feeds API
  description: The Feeds API from Knock — 2 operation(s) for feeds.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Feeds
  properties:
  - type: OpenAPI
    url: openapi/knock-feeds-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-guides-api
  name: Knock Guides API
  description: The Guides API from Knock — 8 operation(s) for guides.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Guides
  properties:
  - type: OpenAPI
    url: openapi/knock-guides-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-integrations-api
  name: Knock Integrations API
  description: The Integrations API from Knock — 2 operation(s) for integrations.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Integration
  tags_raw:
  - Integrations
  properties:
  - type: OpenAPI
    url: openapi/knock-integrations-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-messages-api
  name: Knock Messages API
  description: A message sent to a single recipient on a channel.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/knock-messages-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-objects-api
  name: Knock Objects API
  description: An object represents a resource in your system that you want to map into Knock.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Objects
  properties:
  - type: OpenAPI
    url: openapi/knock-objects-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-providers-api
  name: Knock Providers API
  description: A provider represents a third-party service that Knock integrates with and is configured via a channel.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Providers
  properties:
  - type: OpenAPI
    url: openapi/knock-providers-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-schedules-api
  name: Knock Schedules API
  description: A schedule is a per-recipient, timezone-aware configuration for when to invoke a workflow.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Schedules
  properties:
  - type: OpenAPI
    url: openapi/knock-schedules-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-subscriptions-api
  name: Knock Subscriptions API
  description: A subscription represents a connection between a recipient and an object, used to represent a list.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/knock-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-tenants-api
  name: Knock Tenants API
  description: A tenant represents a top-level entity from your system, like a company, organization, account, or workspace.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Tenants
  properties:
  - type: OpenAPI
    url: openapi/knock-tenants-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-users-api
  name: Knock Users API
  description: A user is an individual from your system, represented in Knock. They are most commonly a recipient of a notification.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/knock-users-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-workflow-recipient-runs-api
  name: Knock Workflow recipient runs API
  description: A workflow run represents an individual execution of a workflow for a specific recipient.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Workflow recipient runs
  properties:
  - type: OpenAPI
    url: openapi/knock-workflow-recipient-runs-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-workflow-triggers-api
  name: Knock Workflow Triggers API
  description: Operations for triggering and canceling workflow executions.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - WorkflowTriggers
  tags_raw:
  - Workflow Triggers
  properties:
  - type: OpenAPI
    url: openapi/knock-workflow-triggers-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
- aid: knock:knock-workflows-api
  name: Knock Workflows API
  description: A workflow is a structured set of steps that is triggered to produce notifications sent over channels.
  humanURL: https://docs.knock.app/reference
  baseURL: https://api.knock.app/v1
  tags:
  - Workflows
  properties:
  - type: OpenAPI
    url: openapi/knock-workflows-api-openapi.yml
  - type: Documentation
    url: https://docs.knock.app/reference
  - type: AsyncAPI
    url: asyncapi/knock-asyncapi.yml
common:
- type: AgenticAccess
  url: agentic-access/knock-agentic-access.yml
- type: DomainSecurity
  url: security/knock-domain-security.yml
- type: Authentication
  url: authentication/knock-authentication.yml
- type: GitHubOrganization
  url: https://github.com/knocklabs
- type: LinkedIn
  url: https://www.linkedin.com/company/knockcrm
- type: Website
  url: https://knock.app/
- type: Plans
  url: plans/knock-plans-pricing.yml
- type: RateLimits
  url: rate-limits/knock-rate-limits.yml
- type: FinOps
  url: finops/knock-finops.yml
- type: LlmsText
  url: https://docs.knock.app/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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