Microsoft Yammer

APIs for Yammer (now Viva Engage) enterprise social networking platform providing access to messages, groups, users, and networks.

Microsoft Yammer publishes 10 API contracts indexed on the APIs.io network, including Files API, Groups API, Messages API, and 7 more. Tagged areas include Enterprise Social, Microsoft, Social Network, Viva Engage, and Yammer.

The Microsoft Yammer catalog on APIs.io includes 1 Spectral governance ruleset.

Microsoft Yammer’s developer surface includes changelog, engineering blog, getting-started guide, documentation, API reference, authentication, developer portal, and 36 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

56.8/100 strong ▬ flat Agent 26/100 agent aware Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Enterprise SocialMicrosoft Social NetworkViva EngageYammer

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 56.8/100 · strong

Contract Quality 8.4 / 19

Developer Ergonomics 8.6 / 15

Access Clarity 8.3 / 15

Operational Transparency 6.7 / 10

Contract Governance 2.0 / 9

Discoverability 5.8 / 8

Regulatory Posture 6.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 44.9 — up to +13.8 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →
Access Clarity scores 55.3 — up to +8.9 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/microsoft-yammer/apis.yml: open an issue on github.com/api-evangelist/microsoft-yammer to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 10

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

Yammer REST API

The Yammer REST API (now Viva Engage) provides access to enterprise social networking features including messages, groups, users, and networks. Developers can post messages, man...

Microsoft Yammer Files API

The Files API from Microsoft Yammer — 1 operation(s) for files.

Microsoft Yammer Groups API

The Groups API from Microsoft Yammer — 2 operation(s) for groups.

Microsoft Yammer Messages API

The Messages API from Microsoft Yammer — 12 operation(s) for messages.

Microsoft Yammer Networks API

The Networks API from Microsoft Yammer — 1 operation(s) for networks.

Microsoft Yammer Search API

The Search API from Microsoft Yammer — 1 operation(s) for search.

Microsoft Yammer Subscriptions API

The Subscriptions API from Microsoft Yammer — 2 operation(s) for subscriptions.

Microsoft Yammer Threads API

The Threads API from Microsoft Yammer — 1 operation(s) for threads.

Microsoft Yammer Topics API

The Topics API from Microsoft Yammer — 1 operation(s) for topics.

Microsoft Yammer Users API

The Users API from Microsoft Yammer — 5 operation(s) for users.

Scroll for all 10

Open Collections 10

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

Viva Engage (Yammer) Legacy REST Files API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Groups API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Messages API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Networks API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Search API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Subscriptions API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Threads API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Topics API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST Files Users API

OPEN COLLECTION

Viva Engage (Yammer) Legacy REST API

OPEN COLLECTION

Scroll for all 10

Microsoft Yammer API pricing

Not yet checked against Microsoft Yammer's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Autocomplete: 10 requests in 10 seconds
Messages: 10 requests in 30 seconds
Notifications: 10 requests in 30 seconds

All 4 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Microsoft Yammer Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Microsoft Yammer Rate Limits

4 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Microsoft Yammer

11 quoted statements, read from Microsoft Yammer's own page on 2026-11-10.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Microsoft Yammer

22 quoted statements, read from Microsoft Yammer's own page on 2026-11-10.

PRIVACY

Deprecation Policy 1

Notice periods, support windows and the headers it sends, quoted from its own page.

Microsoft Yammer

1 quoted statement, read from Microsoft Yammer's own page on 2026-11-10.

DEPRECATION

Compliance 1

Attestations the provider states (SOC 2, ISO 27001 and others), quoted from its own trust page. APIs.io verifies none of them.

Microsoft Yammer

2 quoted statements, read from Microsoft Yammer's own page on 2026-11-10.

COMPLIANCE

Eligibility 1

Who may sign up and where, quoted from its own terms.

Microsoft Yammer

3 quoted statements, read from Microsoft Yammer's own page on 2026-11-10.

ELIGIBILITY

AI Preferences 1

Its stance on AI training, inference and agents, quoted from its own pages.

Microsoft Yammer

2 quoted statements, read from Microsoft Yammer's own page on 2026-11-10.

AI PREFS

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Microsoft Yammer

2 quoted statements, read from Microsoft Yammer's own page on 2026-11-10.

LICENSE

FinOps 1

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

Microsoft Yammer Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Microsoft Yammer API Rules

52 rules · 50 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 4

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

Microsoft Yammer Authentication

oauth2 · 1 scheme

SECURITY

Microsoft Yammer Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Microsoft Yammer Vulnerability Disclosure

security.txt · contact published

SECURITY

Microsoft Yammer Trust Center

GDPR

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Microsoft Yammer Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Agentic Access (API Evangelist recommendations) 1

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

Microsoft Yammer Agentic Access

33 operations · 12 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Portal

Portal

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

AIPreferences

AIPreferences

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

AgenticAccess

AgenticAccess

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

Conventions

Lifecycle

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 9

Authentication, authorization, and security posture

Compliance

SecurityTxt

Security

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

OAuthScopes

Authentication

Scroll for all 9

Operate 5

Status, limits, changes, and where to get help

ChangeLog

Deprecation

RateLimits

Support

DeprecationSchedule

DeprecationSchedule

Commercial 6

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

UsageTerms

DataLicense

Company 3

The organization behind the API

Blog

Blog

Website

Website

LinkedIn

Other 6

Properties that don't map to a standard resource type

Leadership

Hosts

Vendors

DataProcessing

Attestations

Eligibility

Source (apis.yml)

aid: microsoft-yammer
name: Microsoft Yammer
description: APIs for Yammer (now Viva Engage) enterprise social networking platform providing access to messages, groups,
  users, and networks.
type: Index
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/microsoft-yammer.png
tags:
- Enterprise Social
- Microsoft
- Social Network
- Viva Engage
- Yammer
tags_raw:
- Enterprise Social
- Microsoft
- Social Networking
- Viva Engage
- Yammer
created: '2024-01-01'
modified: '2026-04-28'
specificationVersion: '0.23'
url: https://engage.cloud.microsoft/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
common:
- type: Leadership
  url: https://news.microsoft.com/leadership
- type: ChangeLog
  url: https://developer.microsoft.com/en-us/changelog
- type: Blog
  url: https://techcommunity.microsoft.com/category/azure/blog/analyticsonazure
- type: Spectral
  url: rules/microsoft-yammer-rules.yml
- type: Vocabulary
  url: vocabulary/microsoft-yammer-vocabulary.yml
- type: Conventions
  url: conventions/microsoft-yammer-conventions.yml
- type: Compliance
  url: https://www.microsoft.com/en-us/trust-center
- type: Deprecation
  url: https://learn.microsoft.com/en-us/rest/api/yammer/getting-started
- type: Lifecycle
  url: lifecycle/microsoft-yammer-lifecycle.yml
- type: Conformance
  url: conformance/microsoft-yammer-conformance.yml
- type: LLMsTxt
  url: llms/microsoft-yammer-llms.txt
- type: SecurityTxt
  url: well-known/microsoft-yammer-security.txt
- type: WellKnown
  url: well-known/microsoft-yammer-well-known.yml
- type: Hosts
  url: hosts/microsoft-yammer-hosts.yml
- type: Vendors
  url: vendors/microsoft-yammer-vendors.yml
- type: Security
  url: https://www.microsoft.com/security
- type: GettingStarted
  url: https://learn.microsoft.com/en-us/rest/api/yammer/getting-started
- type: Documentation
  url: https://learn.microsoft.com/en-us/rest/api/yammer/
- type: APIReference
  url: https://learn.microsoft.com/en-us/rest/api/yammer/yammer-core-apis
- type: TrustCenter
  url: security/microsoft-yammer-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/microsoft-yammer-vulnerability-disclosure.yml
- type: Plans
  url: plans/microsoft-yammer-plans-pricing.yml
- type: RateLimits
  url: rate-limits/microsoft-yammer-rate-limits.yml
- type: FinOps
  url: finops/microsoft-yammer-finops.yml
- type: Website
  url: https://www.microsoft.com/
- type: AgenticAccess
  url: agentic-access/microsoft-yammer-agentic-access.yml
- type: DomainSecurity
  url: security/microsoft-yammer-domain-security.yml
- type: Authentication
  url: authentication/microsoft-yammer-authentication.yml
- type: OAuthScopes
  url: scopes/microsoft-yammer-scopes.yml
- type: GitHubOrganization
  url: https://github.com/yammer
- type: LinkedIn
  url: https://www.linkedin.com/company/yammer-inc
- type: Portal
  url: https://engage.cloud.microsoft/
- type: Authentication
  url: https://learn.microsoft.com/en-us/rest/api/yammer/oauth-2
- type: TermsOfService
  url: https://www.microsoft.com/en-us/legal/terms-of-use
- type: PrivacyPolicy
  url: https://privacy.microsoft.com/en-us/privacystatement
- type: Support
  url: https://support.microsoft.com/
- type: UsageTerms
  url: terms/microsoft-yammer-terms-of-service.yml
- type: DataProcessing
  url: privacy/microsoft-yammer-privacy-policy.yml
- type: DeprecationSchedule
  url: deprecation/microsoft-yammer-deprecation-policy.yml
- type: Attestations
  url: compliance/microsoft-yammer-compliance.yml
- type: Eligibility
  url: eligibility/microsoft-yammer-eligibility.yml
- type: AIPreferences
  url: ai-preferences/microsoft-yammer-ai-preferences.yml
- type: DataLicense
  url: data-license/microsoft-yammer-data-license.yml
apis:
- aid: microsoft-yammer:rest-api
  name: Yammer REST API
  tags:
  - Enterprise Social
  - Social Network
  - Viva Engage
  tags_raw:
  - Enterprise Social
  - Social Networking
  - Viva Engage
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://www.yammer.com/api/v1/
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  properties:
  - url: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
    type: Documentation
  description: The Yammer REST API (now Viva Engage) provides access to enterprise social networking features including messages,
    groups, users, and networks. Developers can post messages, manage group memberships, search content, and integrate Yammer's
    social collaboration features into custom applications.
- aid: microsoft-yammer:microsoft-yammer-files-api
  name: Microsoft Yammer Files API
  description: The Files API from Microsoft Yammer — 1 operation(s) for files.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - File
  tags_raw:
  - Files
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-files-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-groups-api
  name: Microsoft Yammer Groups API
  description: The Groups API from Microsoft Yammer — 2 operation(s) for groups.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - Group
  tags_raw:
  - Groups
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-groups-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-messages-api
  name: Microsoft Yammer Messages API
  description: The Messages API from Microsoft Yammer — 12 operation(s) for messages.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-messages-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-networks-api
  name: Microsoft Yammer Networks API
  description: The Networks API from Microsoft Yammer — 1 operation(s) for networks.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - Networks
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-networks-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-search-api
  name: Microsoft Yammer Search API
  description: The Search API from Microsoft Yammer — 1 operation(s) for search.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-search-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-subscriptions-api
  name: Microsoft Yammer Subscriptions API
  description: The Subscriptions API from Microsoft Yammer — 2 operation(s) for subscriptions.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-subscriptions-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-threads-api
  name: Microsoft Yammer Threads API
  description: The Threads API from Microsoft Yammer — 1 operation(s) for threads.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - Threads
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-threads-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-topics-api
  name: Microsoft Yammer Topics API
  description: The Topics API from Microsoft Yammer — 1 operation(s) for topics.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - Topic
  tags_raw:
  - Topics
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-topics-api-openapi.yml
- aid: microsoft-yammer:microsoft-yammer-users-api
  name: Microsoft Yammer Users API
  description: The Users API from Microsoft Yammer — 5 operation(s) for users.
  humanURL: https://learn.microsoft.com/en-us/rest/api/yammer/rest-api-rate-limits
  baseURL: https://www.yammer.com/api/v1/
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/microsoft-yammer-users-api-openapi.yml
x-parent: microsoft-365
x-relationship: product
x-enrichment:
  date: '2026-11-12'
  status: enriched
  artifacts_added: 1
  pass: local-v6

Microsoft Yammer API — frequently asked questions

Does Microsoft Yammer have an API?

Yes. APIs.io lists 10 APIs from Microsoft Yammer, including Yammer REST API, Microsoft Yammer Files API and Microsoft Yammer Groups API, and 7 more.

Is there an OpenAPI specification for the Microsoft Yammer API?

Yes. APIs.io indexes 9 OpenAPI specifications for Microsoft Yammer, each linked for download from this page.

How do I authenticate with the Microsoft Yammer API?

Microsoft Yammer documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Microsoft Yammer Authentication.

How much does the Microsoft Yammer API cost?

APIs.io lists 3 pricing plans for Microsoft Yammer, with each plan's price, limits and inclusions under Pricing on this page.

Is the Microsoft Yammer API ready for AI agents?

Microsoft Yammer has a Kin Score of 56.8 out of 100 (strong) and an Agent Readiness score of 26.4 (agent-aware), scored by API Evangelist on 2026-11-13.

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