Yubico

Yubico is the security company behind the YubiKey hardware authentication device and the inventor of the Yubico One-Time Password (OTP). Its public developer surface centers on YubiCloud, a hosted REST service that verifies Yubico OTPs via a signed HTTPS request to api.yubico.com, alongside a broad set of first-party SDKs and libraries for WebAuthn/FIDO2, PIV smart cards, OATH, OTP, and the YubiHSM 2 across Python, .NET, Java, Android, iOS, and C, plus the ykman command-line tool. Yubico co-authored the FIDO U2F standard, ships FIPS 140-3 validated keys, and holds a SOC 2 Type 2 attestation for its enterprise services.

Yubico publishes 1 API on the APIs.io network: Validation API. Tagged areas include Company, Enterprise, Authentication, Security, and Identity.

Yubico’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, signup flow, pricing, and 26 more developer resources.

🌐 Visit website 📡 Source on GitHub

56.4/100 strong ▬ flat Agent 26/100 agent aware Front door AI 3/6 light saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

1 APIs

Company Enterprise Authentication Security Identity Hardware Security FIDO2 WebAuthnOne-Time Password

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 56.4/100 · strong

Contract Quality 10.5 / 21

Developer Ergonomics 12.4 / 17

Access Clarity 10.3 / 17

Operational Transparency 4.1 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 5.3 / 15

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 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 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/. 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/yubico: 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 1

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

Yubico Validation API

Yubico OTP validation operations.

Open Collections 2

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

API Collection

OPEN COLLECTION

Yubico YubiCloud OTP Validation API

OPEN COLLECTION

Security Posture 4

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

Yubico Authentication

apiKey/hmac-signature · 2 schemes

SECURITY

Yubico Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Yubico Vulnerability Disclosure

security.txt · contact published

SECURITY

Yubico Trust Center

SOC 2 Type 2, FIPS 140-3, FIDO2, FIDO U2F, NIST SP 800-63-3 AAL3

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

AgentSkill

LLMsTxt

WellKnown

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 7

Authentication, authorization, and security posture

SecurityTxt

Authentication

Compliance

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

TrustCenter

TrustCenter

Scroll for all 7

Operate 3

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Deprecation

Deprecation

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: yubico
name: Yubico
description: Yubico is the security company behind the YubiKey hardware authentication device and the inventor of the Yubico
  One-Time Password (OTP). Its public developer surface centers on YubiCloud, a hosted REST service that verifies Yubico OTPs
  via a signed HTTPS request to api.yubico.com, alongside a broad set of first-party SDKs and libraries for WebAuthn/FIDO2,
  PIV smart cards, OATH, OTP, and the YubiHSM 2 across Python, .NET, Java, Android, iOS, and C, plus the ykman command-line
  tool. Yubico co-authored the FIDO U2F standard, ships FIPS 140-3 validated keys, and holds a SOC 2 Type 2 attestation for
  its enterprise services.
url: https://raw.githubusercontent.com/api-evangelist/yubico/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
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:
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
image: https://www.yubico.com/wp-content/uploads/2021/02/Yubico-Logo.png
tags:
- Company
- Enterprise
- Authentication
- Security
- Identity
- Hardware Security
- FIDO2
- WebAuthn
- One-Time Password
apis:
- aid: yubico:yubico-validation-api
  name: Yubico Validation API
  description: Yubico OTP validation operations.
  humanURL: https://developers.yubico.com/Software_Projects/YubiCloud_REST_API.html
  baseURL: https://api.yubico.com/wsapi/2.0
  tags:
  - Validation
  properties:
  - type: OpenAPI
    url: openapi/yubico-validation-api-openapi.yml
  - type: Documentation
    url: https://developers.yubico.com/OTP/
  - type: APIReference
    url: https://developers.yubico.com/Software_Projects/YubiCloud_REST_API.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/yubico-yubicloud-overlay.yaml
- type: Website
  url: https://yubico.com
- type: DeveloperPortal
  url: https://developers.yubico.com/
- type: Documentation
  url: https://developers.yubico.com/OTP/
- type: APIReference
  url: https://developers.yubico.com/Software_Projects/YubiCloud_REST_API.html
- type: GettingStarted
  url: https://developers.yubico.com/OTP/OTP_Walk-Through.html
- type: GitHubOrganization
  url: https://github.com/Yubico
- type: Support
  url: https://support.yubico.com/
- type: Blog
  url: https://www.yubico.com/blog/
- type: SignUp
  url: https://upgrade.yubico.com/getapikey/
- type: Pricing
  url: https://www.yubico.com/store/
- type: TermsOfService
  url: https://www.yubico.com/support/terms-conditions/
- type: PrivacyPolicy
  url: https://www.yubico.com/support/terms-conditions/privacy-notice/
- type: StatusPage
  url: https://status.yubico.com/
- type: Deprecation
  url: https://support.yubico.com/hc/en-us/articles/360016614820
- type: Packages
  url: packages/yubico-packages.yml
- type: SDKs
  url: packages/yubico-packages.yml
- type: CLI
  url: cli/yubico-cli.yml
- type: X-MCPServerCandidate
  url: mcp/yubico-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/yubico-llms.txt
- type: WellKnown
  url: well-known/yubico-well-known.yml
- type: SecurityTxt
  url: well-known/yubico-security.txt
- type: Authentication
  url: authentication/yubico-authentication.yml
- type: Conventions
  url: conventions/yubico-conventions.yml
- type: ErrorCatalog
  url: errors/yubico-error-codes.yml
- type: Lifecycle
  url: lifecycle/yubico-lifecycle.yml
- type: Conformance
  url: conformance/yubico-conformance.yml
- type: Compliance
  url: https://www.yubico.com/solutions/cybersecurity-compliance/
- type: DomainSecurity
  url: security/yubico-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/yubico-vulnerability-disclosure.yml
- type: Security
  url: https://www.yubico.com/support/issue-rating-system/
- type: TrustCenter
  url: security/yubico-trust-center.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 18
  pass: local-v1

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