Microsoft Defender website screenshot

Microsoft Defender

Collection of Microsoft Defender security APIs for threat protection, endpoint security, and security operations.

Microsoft Defender publishes 3 APIs on the APIs.io network: Alerts API, Machines API, and Vulnerabilities API.

The Microsoft Defender catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Microsoft Defender’s developer surface includes authentication, developer portal, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
52.2/100 developing ▬ flat Agent 37/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
9 APIs

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 52.2/100 · developing
Contract Quality 18.7 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 12.1 / 20
Operational Transparency 6.8 / 13
Governance 7.0 / 12
Discoverability 3.7 / 10
Agent readiness — 37/100 · 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 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 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/microsoft-defender: 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 9

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

Microsoft Defender for Cloud Apps API

Cloud Access Security Broker (CASB) API for discovering, investigating, and governing cloud apps.

Microsoft Defender Threat Intelligence API

Access threat intelligence data, indicators of compromise (IOCs), and threat analytics.

Microsoft Defender for Office 365 API

API for email and collaboration protection including anti-phishing, anti-malware, and safe attachments.

Microsoft Defender XDR API

Unified extended detection and response API for automating workflows based on shared incident and advanced hunting tables across Microsoft security products.

Microsoft Defender for Cloud REST API

REST API for unified security management and advanced threat protection across hybrid cloud workloads in Azure, other clouds, and on-premises.

Microsoft Defender for Identity API

API for identity-based attack detection and investigation across on-premises Active Directory and hybrid environments, with sensor management via Microsoft Graph.

Microsoft Defender Alerts API

Manage security alerts generated by Microsoft Defender for Endpoint. Alerts represent detected threats, suspicious activities, and security events on endpoints.

Microsoft Defender Machines API

Manage devices (machines) that have communicated with Microsoft Defender for Endpoint. Retrieve device information, health status, risk scores, and exposure levels.

Microsoft Defender Vulnerabilities API

Retrieve vulnerability information from Microsoft Defender Vulnerability Management. Access CVE data, severity scores, exploit information, and exposure metrics.

Scroll for all 9

Open Collections 1

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

Microsoft Defender for Endpoint API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Microsoft Defender Plans Pricing

17 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Microsoft Defender Rate Limits

6 limits

RATE LIMITS

FinOps 1

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

Microsoft Defender Finops

FINOPS

Semantic Vocabularies 1

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

Microsoft Defender Context

0 classes · 5 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Microsoft Defender API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 9

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

Microsoft Defender for Endpoint Alert

29 properties

JSON SCHEMA

AlertComment

3 properties

JSON SCHEMA

AlertEvidence

25 properties

JSON SCHEMA

AlertUpdate

5 properties

JSON SCHEMA

IpAddress

4 properties

JSON SCHEMA

Machine

21 properties

JSON SCHEMA

MachineReference

4 properties

JSON SCHEMA

RelatedUser

2 properties

JSON SCHEMA

Vulnerability

17 properties

JSON SCHEMA

Scroll for all 9

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Microsoft Defender Structure

0 properties

JSON STRUCTURE

Security Posture 3

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

Microsoft Defender Authentication

oauth2 · 1 scheme

SECURITY

Microsoft Defender Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Microsoft Defender Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Microsoft Defender Scopes

1 scope · clientCredentials/authorizationCode

1 scopes

SCOPES

Agentic Access 1

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

Microsoft Defender Agentic Access

10 operations · 1 acting

10 operations · 1 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal
Portal

Documentation 1

Reference material describing how the API behaves

Documentation Hub
Documentation Hub

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 7

Authentication, authorization, and security posture

VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 Authentication
Authentication
 OAuthScopes
OAuthScopes
 Security Blog
Security Blog
 Authentication Overview
Authentication Overview
 Security Pricing Overview
Security Pricing Overview

Scroll for all 7

Operate 2

Status, limits, changes, and where to get help

StatusPage
StatusPage
 Developer Changelog
Developer Changelog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Other 1

Properties that don't map to a standard resource type

Microsoft Graph Explorer
Microsoft Graph Explorer

Source (apis.yml)

apis.yml Raw ↑ 
name: Microsoft Defender
description: Collection of Microsoft Defender security APIs for threat protection, endpoint security, and security operations.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://www.microsoft.com/favicon.ico
created: '2024-01-15'
modified: '2026-05-19'
specificationVersion: '0.18'
url: https://raw.githubusercontent.com/api-evangelist/microsoft-defender/refs/heads/main/apis.yml
apis:
- name: Microsoft Defender for Cloud Apps API
  description: Cloud Access Security Broker (CASB) API for discovering, investigating, and governing cloud apps.
  image: https://www.microsoft.com/favicon.ico
  humanUrl: https://learn.microsoft.com/en-us/defender-cloud-apps/
  baseUrl: https://portal.cloudappsecurity.com/api
  tags:
  - CASB
  - Cloud Security
  - Data Protection
  - Shadow IT
  properties:
  - type: Documentation
    url: https://learn.microsoft.com/en-us/defender-cloud-apps/api-introduction
  - type: Authentication
    url: https://learn.microsoft.com/en-us/defender-cloud-apps/api-authentication
  - type: Activities API
    url: https://learn.microsoft.com/en-us/defender-cloud-apps/api-activities
  - type: Alerts API
    url: https://learn.microsoft.com/en-us/defender-cloud-apps/api-alerts
  - type: Entities API
    url: https://learn.microsoft.com/en-us/defender-cloud-apps/api-entities
  - type: Cloud Discovery API
    url: https://learn.microsoft.com/en-us/defender-cloud-apps/api-discovery
- name: Microsoft Defender Threat Intelligence API
  description: Access threat intelligence data, indicators of compromise (IOCs), and threat analytics.
  image: https://www.microsoft.com/favicon.ico
  humanUrl: https://learn.microsoft.com/en-us/defender/threat-intelligence/
  baseUrl: https://graph.microsoft.com/v1.0/security/threatIntelligence
  tags:
  - IOC
  - Security Intelligence
  - Threat Analytics
  - Threat Intelligence
  properties:
  - type: Documentation
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-threatintelligence-overview
  - type: APIReference
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview
  - type: Authentication
    url: https://learn.microsoft.com/en-us/graph/auth/
- name: Microsoft Defender for Office 365 API
  description: API for email and collaboration protection including anti-phishing, anti-malware, and safe attachments.
  image: https://www.microsoft.com/favicon.ico
  humanUrl: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/
  baseUrl: https://graph.microsoft.com/v1.0/security
  tags:
  - Collaboration Security
  - Email Security
  - Phishing Protection
  - Safe Attachments
  properties:
  - type: Documentation
    url: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/defender-for-office-365
  - type: Threat Protection
    url: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/threat-explorer
  - type: Safe Links
    url: https://learn.microsoft.com/en-us/defender-office-365/safe-links-about
  - type: Safe Attachments
    url: https://learn.microsoft.com/en-us/defender-office-365/safe-attachments-about
  - type: Service Description
    url: https://learn.microsoft.com/en-us/office365/servicedescriptions/office-365-advanced-threat-protection-service-description
- name: Microsoft Defender XDR API
  description: Unified extended detection and response API for automating workflows based on shared incident and advanced
    hunting tables across Microsoft security products.
  image: https://www.microsoft.com/favicon.ico
  humanUrl: https://learn.microsoft.com/en-us/defender-xdr/api-overview
  baseUrl: https://api.security.microsoft.com/api
  tags:
  - Advanced Hunting
  - Event Streaming
  - Incidents
  - Threat Protection
  - XDR
  properties:
  - type: Documentation
    url: https://learn.microsoft.com/en-us/defender-xdr/api-overview
  - type: APIReference
    url: https://learn.microsoft.com/en-us/defender-xdr/api-supported
  - type: Authentication
    url: https://learn.microsoft.com/en-us/defender-xdr/api-access
  - type: Incidents API
    url: https://learn.microsoft.com/en-us/defender-xdr/api-incident
  - type: Advanced Hunting API
    url: https://learn.microsoft.com/en-us/defender-xdr/api-advanced-hunting
  - type: Streaming API
    url: https://learn.microsoft.com/en-us/defender-xdr/streaming-api
  - type: Supported Event Types
    url: https://learn.microsoft.com/en-us/defender-xdr/supported-event-types
  - type: ErrorCodes
    url: https://learn.microsoft.com/en-us/defender-xdr/api-error-codes
- name: Microsoft Defender for Cloud REST API
  description: REST API for unified security management and advanced threat protection across hybrid cloud workloads in Azure,
    other clouds, and on-premises.
  image: https://www.microsoft.com/favicon.ico
  humanUrl: https://learn.microsoft.com/en-us/azure/defender-for-cloud/defender-for-cloud-introduction
  baseUrl: https://management.azure.com
  tags:
  - Azure Security
  - Cloud Security
  - CSPM
  - Security Posture
  - Workload Protection
  properties:
  - type: Documentation
    url: https://learn.microsoft.com/en-us/rest/api/defenderforcloud/
  - type: GettingStarted
    url: https://learn.microsoft.com/en-us/azure/defender-for-cloud/get-started
  - type: Pricing
    url: https://azure.microsoft.com/en-us/pricing/details/defender-for-cloud/
  - type: ReleaseNotes
    url: https://learn.microsoft.com/en-us/azure/defender-for-cloud/release-notes
- name: Microsoft Defender for Identity API
  description: API for identity-based attack detection and investigation across on-premises Active Directory and hybrid environments,
    with sensor management via Microsoft Graph.
  image: https://www.microsoft.com/favicon.ico
  humanUrl: https://learn.microsoft.com/en-us/defender-for-identity/
  baseUrl: https://graph.microsoft.com/v1.0/security/identities
  tags:
  - Active Directory
  - Identity Security
  - Identity Threat Detection
  - Sensor Management
  properties:
  - type: Documentation
    url: https://learn.microsoft.com/en-us/defender-for-identity/
  - type: Overview
    url: https://learn.microsoft.com/en-us/defender-for-identity/what-is
  - type: Architecture
    url: https://learn.microsoft.com/en-us/defender-for-identity/architecture
  - type: Graph Security API
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview
- aid: microsoft-defender:microsoft-defender-alerts-api
  name: Microsoft Defender Alerts API
  description: Manage security alerts generated by Microsoft Defender for Endpoint. Alerts represent detected threats, suspicious
    activities, and security events on endpoints.
  tags:
  - Alerts
  properties:
  - type: OpenAPI
    url: openapi/microsoft-defender-alerts-api-openapi.yml
  - type: Documentation
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/apis-intro
  - type: JSONSchema
    url: json-schema/microsoft-defender-alert-schema.json
  - type: JSONLD
    url: json-ld/microsoft-defender-context.jsonld
  - type: Authentication
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/exposed-apis-create-app-webapp
  - type: Pricing
    url: https://www.microsoft.com/en-us/security/business/endpoint-security/microsoft-defender-endpoint-pricing
  - type: APIReference
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/exposed-apis-list
  - type: ReleaseNotes
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/api-release-notes
  - type: Management APIs
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/management-apis
  - type: Alerts API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-alerts
  - type: Vulnerabilities API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-all-vulnerabilities
  - type: Security Recommendations API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-security-recommendations
  - type: Documentation
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview
  - type: SDKs
    url: https://learn.microsoft.com/en-us/graph/sdks/sdks-overview
  - type: Code Samples
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview#common-use-cases
- aid: microsoft-defender:microsoft-defender-machines-api
  name: Microsoft Defender Machines API
  description: Manage devices (machines) that have communicated with Microsoft Defender for Endpoint. Retrieve device information,
    health status, risk scores, and exposure levels.
  tags:
  - Machines
  properties:
  - type: OpenAPI
    url: openapi/microsoft-defender-machines-api-openapi.yml
  - type: Documentation
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/apis-intro
  - type: JSONSchema
    url: json-schema/microsoft-defender-alert-schema.json
  - type: JSONLD
    url: json-ld/microsoft-defender-context.jsonld
  - type: Authentication
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/exposed-apis-create-app-webapp
  - type: Pricing
    url: https://www.microsoft.com/en-us/security/business/endpoint-security/microsoft-defender-endpoint-pricing
  - type: APIReference
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/exposed-apis-list
  - type: ReleaseNotes
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/api-release-notes
  - type: Management APIs
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/management-apis
  - type: Alerts API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-alerts
  - type: Vulnerabilities API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-all-vulnerabilities
  - type: Security Recommendations API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-security-recommendations
  - type: Documentation
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview
  - type: SDKs
    url: https://learn.microsoft.com/en-us/graph/sdks/sdks-overview
  - type: Code Samples
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview#common-use-cases
- aid: microsoft-defender:microsoft-defender-vulnerabilities-api
  name: Microsoft Defender Vulnerabilities API
  description: Retrieve vulnerability information from Microsoft Defender Vulnerability Management. Access CVE data, severity
    scores, exploit information, and exposure metrics.
  tags:
  - Vulnerabilities
  properties:
  - type: OpenAPI
    url: openapi/microsoft-defender-vulnerabilities-api-openapi.yml
  - type: Documentation
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/apis-intro
  - type: JSONSchema
    url: json-schema/microsoft-defender-alert-schema.json
  - type: JSONLD
    url: json-ld/microsoft-defender-context.jsonld
  - type: Authentication
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/exposed-apis-create-app-webapp
  - type: Pricing
    url: https://www.microsoft.com/en-us/security/business/endpoint-security/microsoft-defender-endpoint-pricing
  - type: APIReference
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/exposed-apis-list
  - type: ReleaseNotes
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/api-release-notes
  - type: Management APIs
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/management-apis
  - type: Alerts API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-alerts
  - type: Vulnerabilities API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-all-vulnerabilities
  - type: Security Recommendations API
    url: https://learn.microsoft.com/en-us/defender-endpoint/api/get-security-recommendations
  - type: Documentation
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview
  - type: SDKs
    url: https://learn.microsoft.com/en-us/graph/sdks/sdks-overview
  - type: Code Samples
    url: https://learn.microsoft.com/en-us/graph/api/resources/security-api-overview#common-use-cases
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
common:
- type: AgenticAccess
  url: agentic-access/microsoft-defender-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/microsoft-defender-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/microsoft-defender-domain-security.yml
- type: Authentication
  url: authentication/microsoft-defender-authentication.yml
- type: OAuthScopes
  url: scopes/microsoft-defender-scopes.yml
- type: GitHubOrganization
  url: https://github.com/MicrosoftDocs
- type: Portal
  url: https://security.microsoft.com
- type: Documentation Hub
  url: https://learn.microsoft.com/en-us/microsoft-365/security/
- type: StatusPage
  url: https://status.azure.com/
- type: TermsOfService
  url: https://www.microsoft.com/en-us/legal/terms-of-use
- type: PrivacyPolicy
  url: https://privacy.microsoft.com/en-us/privacystatement
- type: Developer Changelog
  url: https://developer.microsoft.com/en-us/changelog
- type: Security Blog
  url: https://www.microsoft.com/en-us/security/blog/
- type: Microsoft Graph Explorer
  url: https://developer.microsoft.com/en-us/graph/graph-explorer
- type: Authentication Overview
  url: https://learn.microsoft.com/en-us/graph/auth/
- type: Security Pricing Overview
  url: https://www.microsoft.com/en-us/security/pricing-overview