Marsh & McLennan

Marsh & McLennan Companies is a global professional services firm offering clients advice and solutions in risk, strategy, and people through Marsh, Guy Carpenter, Mercer, and Oliver Wyman. The firm does not currently publish a public developer portal or self-service APIs; data exchange with clients is conducted through engagement-specific integrations.

Marsh & McLennan is profiled on the APIs.io network. Tagged areas include Fortune 500, Insurance, Risk Management, Consulting, and Professional Services.

🌐 Visit website 📡 Source on GitHub

2.6/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

0 APIs

Fortune 500 Insurance Risk Management Consulting Professional Services

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 2.6/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 1.4 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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

Regulatory Posture applies to this provider. Its tags matched the Insurance 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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/. This rating is computed from github.com/api-evangelist/marsh-and-mclennan: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

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

Marsh And Mclennan Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Press 5

Recent news and press coverage referencing this provider.

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: marsh-and-mclennan
name: Marsh & McLennan
description: Marsh & McLennan Companies is a global professional services firm offering clients advice and solutions in risk,
  strategy, and people through Marsh, Guy Carpenter, Mercer, and Oliver Wyman. The firm does not currently publish a public
  developer portal or self-service APIs; data exchange with clients is conducted through engagement-specific integrations.
kind: company
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/marsh-and-mclennan.png
url: https://raw.githubusercontent.com/api-evangelist/marsh-and-mclennan/refs/heads/main/apis.yml
tags:
- Fortune 500
- Insurance
- Risk Management
- Consulting
- Professional Services
created: '2026-03-21'
modified: '2026-04-28'
specificationVersion: '0.23'
apis: []
common:
- type: DomainSecurity
  url: security/marsh-and-mclennan-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/MarshMcLennan
- type: Website
  url: https://www.mmc.com
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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