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 contract indexed on the APIs.io network: Validation API. Tagged areas include Company, Enterprise, Authentication, Security, and Identity.

The Yubico catalog on APIs.io includes 1 Spectral governance ruleset.

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

🌐 Visit website 📡 Profile data on GitHub

58.3/100 strong ▬ flat Agent 26/100 agent aware Front door AI 3/6 light Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 Agent Skills

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

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Cybersecurity Management

BC-620

Validation

GET /verify

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 58.3/100 · strong

Contract Quality 10.5 / 21

Developer Ergonomics 12.6 / 17

Access Clarity 10.3 / 17

Operational Transparency 4.1 / 11

Contract Governance 3.2 / 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

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 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/.

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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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

5 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 49.6 — up to +12.6 composite points
Operational Transparency scores 36.8 — up to +8.2 composite points
Contract Governance scores 31.8 — up to +8.2 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/yubico/apis.yml: open an issue on github.com/api-evangelist/yubico 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Identity and Auth	standard	45.7	-	-
Mobile SDK Publishers (Play SDK Index, CocoaPods, ADA certification)	standard	45.7	-	-
OpenID Certified Implementations (OIDC, FAPI, OpenID4VC)	standard	45.7	-	-
NIST CMVP FIPS 140 Validated Cryptographic Modules (FIPS 140-1 / 140-2 / 140-3)	standard	45.7	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

WebAuthn

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 1

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

Yubico Validation API

Yubico OTP validation operations.

Open Collections 1

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

Yubico YubiCloud OTP Validation API

OPEN COLLECTION

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

Verify a Yubico OTP with YubiCloud

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Yubico API Rules

61 rules · 59 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Yubico Yubicloud Overlay

2 actions · update · yubico-yubicloud-openapi.yml

DERIVED

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 5

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

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 3

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

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: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
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: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/yubico/overview
- url: https://www.yubico.com/feed/
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/yubico-capability-edges.yml
  name: Yubico Business Capability Map
- 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

Yubico API — frequently asked questions

Does Yubico have an API?

Yes. APIs.io lists 1 API from Yubico, including Yubico Validation API.

Is there an OpenAPI specification for the Yubico API?

Yes. APIs.io indexes 1 OpenAPI specification for Yubico, each linked for download from this page.

How do I authenticate with the Yubico API?

Yubico uses bearer-token authentication (apiKey/hmac-signature · 2 schemes). The details are profiled on APIs.io as Yubico Authentication.

Is the Yubico API ready for AI agents?

Yubico has a Kin Score of 58.3 out of 100 (strong) and an Agent Readiness score of 25.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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