Duo

Duo provides cloud-based multi-factor authentication and identity security solutions, helping organizations protect access to applications and data. Their platform offers MFA, single sign‑on, device trust, passwordless login, and security intelligence, serving enterprises, SMBs, government, and MSPs worldwide. Duo’s services include a robust admin console, detailed reporting, and integrations with thousands of applications, enabling secure, seamless user experiences across on‑premises and cloud environments.

Duo is listed with 1 API on the APIs.io network. Tagged areas include Security, Multi-Factor Authentication, Identity Management, Cloud Services, and Enterprise.

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

Duo’s developer surface includes changelog, signup flow, documentation, API reference, getting-started guide, support, engineering blog, and 29 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

54.3/100 strong Agent 12/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API

Security Multi-Factor AuthenticationIdentity ManagementCloud Services Enterprise

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 54.3/100 · strong

Contract Quality 3.5 / 21

Developer Ergonomics 8.9 / 17

Access Clarity 15.7 / 17

Operational Transparency 8.4 / 11

Contract Governance 2.2 / 10

Discoverability 4.9 / 9

Regulatory Posture 5.3 / 15

Agent readiness — 12/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 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 4 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 16.3 — up to +20.9 composite points
Developer Ergonomics scores 52.4 — up to +9.5 composite points
Contract Governance scores 22.0 — up to +9.4 composite points

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.

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/duo/apis.yml: open an issue on github.com/api-evangelist/duo 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 →

APIs 1

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

Duo API

Duo provides cloud-based multi-factor authentication and identity security solutions.

Pricing Plans 1

Published pricing tiers and plan structures.

Duo Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Duo Rate Limits

2 limits

RATE LIMITS

Semantic Vocabularies 1

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

Duo Context

7 classes · 18 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Duo API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

Security Posture 3

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

Duo Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Duo Vulnerability Disclosure

security.txt · contact published

SECURITY

Duo Trust Center

SOC 2, ISO 27001, PCI DSS

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

SignUp

SignUp

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Lifecycle

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 7

Authentication, authorization, and security posture

Compliance

Security

SecurityTxt

SecurityTxt

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Scroll for all 7

Operate 5

Status, limits, changes, and where to get help

RateLimits

ChangeLog

Deprecation

StatusPage

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: duo
name: Duo
image: https://duo.com/assets/img/seo-images/social-share-home.jpg
description: Duo provides cloud-based multi-factor authentication and identity security solutions, helping organizations protect
  access to applications and data. Their platform offers MFA, single sign‑on, device trust, passwordless login, and security
  intelligence, serving enterprises, SMBs, government, and MSPs worldwide. Duo’s services include a robust admin console,
  detailed reporting, and integrations with thousands of applications, enabling secure, seamless user experiences across on‑premises
  and cloud environments.
url: https://raw.githubusercontent.com/api-evangelist/duo/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-25 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-24'
modified: '2026-10-24'
tags:
- Security
- Multi-Factor Authentication
- Identity Management
- Cloud Services
- Enterprise
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/duo-rate-limits.yml
- type: Plans
  url: plans/duo-plans-pricing.yml
- type: Spectral
  url: rules/duo-rules.yml
- type: JSONLD
  url: json-ld/duo-context.jsonld
- type: Vocabulary
  url: vocabulary/duo-vocabulary.yml
- type: DataModel
  url: data-model/duo-data-model.yml
- type: ChangeLog
  url: changelog/duo-changelog.yml
- type: Compliance
  url: https://duo.com/support/security-and-reliability
- type: Security
  url: https://duo.com/about/security-and-reliability/security-response
- type: Deprecation
  url: lifecycle/duo-lifecycle.yml
- type: Lifecycle
  url: lifecycle/duo-lifecycle.yml
- type: Conformance
  url: conformance/duo-conformance.yml
- type: LLMsTxt
  url: llms/duo-llms.txt
- type: SecurityTxt
  url: well-known/duo-status-security.txt
- type: SecurityTxt
  url: well-known/duo-security.txt
- type: WellKnown
  url: well-known/duo-well-known.yml
- type: Hosts
  url: hosts/duo-hosts.yml
- type: Vendors
  url: vendors/duo-vendors.yml
- type: SDKs
  url: packages/duo-packages.yml
- type: Packages
  url: packages/duo-packages.yml
- type: StatusPage
  url: https://status.duo.com/
- type: SignUp
  url: https://signup.duo.com/
- type: DeveloperPortal
  url: https://ecosystem.duo.com/onboarding/developer
- type: TrustCenter
  url: security/duo-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/duo-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/duo-domain-security.yml
- type: Website
  url: https://duo.com
- type: Documentation
  url: https://duo.com/docs
- type: APIReference
  url: https://duo.com/docs/authapi
- type: GettingStarted
  url: https://duo.com/docs/getting-started
- type: Support
  url: https://help.duo.com
- type: Blog
  url: https://duo.com/blog
- type: GitHubOrganization
  url: https://github.com/duosecurity
- type: Pricing
  url: https://duo.com/pricing
- type: TermsOfService
  url: https://duo.com/terms
- type: PrivacyPolicy
  url: https://duo.com/privacy
apis:
- name: Duo API
  description: Duo provides cloud-based multi-factor authentication and identity security solutions.
  humanURL: https://duo.com/docs
  baseURL: null
  aid: duo:duo-api
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Docs site https://docs.duo.com returns no machine-readable spec and appears to be JavaScript-rendered.
  evidence:
  - url: https://docs.duo.com
    status: null
  checked: '2026-10-25'
x-enrichment:
  date: '2026-10-25'
  status: enriched
  artifacts_added: 19
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Duo API — frequently asked questions

Does Duo have an API?

Yes. APIs.io lists 1 API from Duo, including Duo API.

How much does the Duo API cost?

APIs.io lists 4 pricing plans for Duo, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Duo API ready for AI agents?

Duo has a Kin Score of 54.3 out of 100 (strong) and an Agent Readiness score of 11.9 (agent-aware), scored by API Evangelist on 2026-10-31.

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get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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