Google Cloud KMS

Google Cloud Key Management Service (KMS) allows you to create, import, and manage cryptographic keys and perform cryptographic operations in a central cloud service. It supports encryption, decryption, signing, and verification using symmetric and asymmetric keys for securing data and workloads.

Google Cloud KMS publishes 3 API contracts indexed on the APIs.io network: Crypto Keys API, Crypto Operations API, and Key Rings API. Tagged areas include Cryptography, Encryption, Google Cloud, Key Management, and KMS.

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

Google Cloud KMS’s developer surface includes authentication, developer portal, getting-started guide, documentation, pricing, support, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

53.2/100 developing ▬ flat Agent 25/100 agent aware saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaidSelf serve

1 published contract

Cryptography Encryption Google Cloud Key Management KMS Security

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

Crypto KeysCrypto OperationsKey Rings

POST /projects/{projectId}/locations/{location}/keyRings/{keyRingId}/cryptoKeys/{cryptoKeyId}:encrypt POST /projects/{projectId}/locations/{location}/keyRings

Kin Score

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

Composite quality — 53.2/100 · developing

Contract Quality 10.2 / 19

Developer Ergonomics 7.3 / 15

Access Clarity 10.7 / 15

Operational Transparency 3.6 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 6.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 25/100 · 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
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

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 54.2 — up to +11.5 composite points
Contract Governance scores 9.8 — up to +10.8 composite points
Developer Ergonomics scores 48.8 — up to +10.2 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/google-cloud-kms/apis.yml: open an issue on github.com/api-evangelist/google-cloud-kms 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
PKI and Encryption (certificate authorities, key management)	undeclared	-	-	-

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.

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 3

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

Google Cloud KMS Crypto Keys API

The Crypto Keys API from Google Cloud KMS — 2 operation(s) for crypto keys.

Google Cloud KMS Crypto Operations API

The Crypto Operations API from Google Cloud KMS — 2 operation(s) for crypto operations.

Google Cloud KMS Key Rings API

The Key Rings API from Google Cloud KMS — 2 operation(s) for key rings.

Postman Collections 3

Ready-to-run Postman collections for exercising this provider's APIs.

Google Cloud KMS Crypto Keys API

POSTMAN

Google Cloud KMS Crypto Keys Crypto Operations API

POSTMAN

Google Cloud KMS Crypto Keys Key Rings API

POSTMAN

Open Collections 4

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

Google Cloud KMS Crypto Keys API

OPEN COLLECTION

Google Cloud KMS Crypto Keys Crypto Operations API

OPEN COLLECTION

Google Cloud KMS Crypto Keys Key Rings API

OPEN COLLECTION

Google Cloud KMS API

OPEN COLLECTION

Google Cloud KMS API pricing

Prices published by Google Cloud KMS, read 2026-10-28 from cloud.google.com/kms/pricing. A free plan or tier is listed.

Plan	Price
Active key versions — SOFTWARE protection level	$0.000082192/ 1 hour per active key version per hour
Active key versions — HSM protection level	$0.001369863/ 1 hour per active key version per hour
Active key versions — EXTERNAL or EXTERNAL_VPC	$0.004109589/ 1 hour per active key version per hour
Active asymmetric RSA 3072/4096 or EC key versions (HSM, 0–2,000/month)	$0.003424658/ 1 hour, per 1 month/ account per key version per hour
Key operations: Cryptographic	$0.03/ 10,000 count per 10,000 cryptographic operations Includes: 10,000 operations monthly free (Autokey)
Key operations: Cryptographic (EXTERNAL)	$0.15/ 10,000 count per 10,000 operations
Destroyed key versions / Key operations: Admin	Free
Single-tenant Cloud HSM instance	$4.794520548/ 1 hour per instance per hour Includes: Each instance supports 15,000 key versions at no additional cost

All 9 plans, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Google Cloud KMS's documentation. All 5 limits →

Billed by: active key version per hour · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Google Cloud Kms Plans Pricing

9 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Google Cloud Kms Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Google Cloud KMS

SLA

FinOps 1

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

Google Cloud Kms Finops

FINOPS

Semantic Vocabularies 1

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

context Context

3 classes · 0 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Google Cloud KMS — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

CryptoKey

10 properties

JSON SCHEMA

Security Posture 3

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

Google Cloud Kms Authentication

oauth2 · 1 scheme

SECURITY

Google Cloud Kms Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Google Cloud Kms Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Google Cloud Kms Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Agentic Access 1

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

Google Cloud Kms Agentic Access

9 operations · 5 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLDContext

JSONLDContext

Build 2

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

Authentication

OAuthScopes

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Support

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: google-cloud-kms
name: Google Cloud KMS
description: Google Cloud Key Management Service (KMS) allows you to create, import, and manage cryptographic keys and perform
  cryptographic operations in a central cloud service. It supports encryption, decryption, signing, and verification using
  symmetric and asymmetric keys for securing data and workloads.
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: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Paid · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/google-cloud-kms.png
url: https://raw.githubusercontent.com/api-evangelist/google-cloud-kms/refs/heads/main/apis.yml
created: '2026-03-13'
modified: '2026-05-19'
specificationVersion: '0.23'
type: Index
tags:
- Cryptography
- Encryption
- Google Cloud
- Key Management
- KMS
- Security
apis:
- aid: google-cloud-kms:google-cloud-kms-crypto-keys-api
  name: Google Cloud KMS Crypto Keys API
  description: The Crypto Keys API from Google Cloud KMS — 2 operation(s) for crypto keys.
  humanURL: https://cloud.google.com/kms
  baseURL: https://cloudkms.googleapis.com
  tags:
  - Crypto Keys
  properties:
  - type: OpenAPI
    url: openapi/google-cloud-kms-crypto-keys-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/kms/docs/reference/rest
  - type: Authentication
    url: https://cloud.google.com/kms/docs/iam
  - type: GettingStarted
    url: https://cloud.google.com/kms/docs/quickstart
  - type: JSONSchema
    url: json-schema/crypto-key.json
  - type: JSONLDContext
    url: json-ld/context.jsonld
- aid: google-cloud-kms:google-cloud-kms-crypto-operations-api
  name: Google Cloud KMS Crypto Operations API
  description: The Crypto Operations API from Google Cloud KMS — 2 operation(s) for crypto operations.
  humanURL: https://cloud.google.com/kms
  baseURL: https://cloudkms.googleapis.com
  tags:
  - Crypto Operations
  properties:
  - type: OpenAPI
    url: openapi/google-cloud-kms-crypto-operations-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/kms/docs/reference/rest
  - type: Authentication
    url: https://cloud.google.com/kms/docs/iam
  - type: GettingStarted
    url: https://cloud.google.com/kms/docs/quickstart
  - type: JSONSchema
    url: json-schema/crypto-key.json
  - type: JSONLDContext
    url: json-ld/context.jsonld
- aid: google-cloud-kms:google-cloud-kms-key-rings-api
  name: Google Cloud KMS Key Rings API
  description: The Key Rings API from Google Cloud KMS — 2 operation(s) for key rings.
  humanURL: https://cloud.google.com/kms
  baseURL: https://cloudkms.googleapis.com
  tags:
  - Key Rings
  properties:
  - type: OpenAPI
    url: openapi/google-cloud-kms-key-rings-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/kms/docs/reference/rest
  - type: Authentication
    url: https://cloud.google.com/kms/docs/iam
  - type: GettingStarted
    url: https://cloud.google.com/kms/docs/quickstart
  - type: JSONSchema
    url: json-schema/crypto-key.json
  - type: JSONLDContext
    url: json-ld/context.jsonld
common:
- type: Plans
  url: plans/google-cloud-kms-plans-pricing.yml
- type: RateLimits
  url: rate-limits/google-cloud-kms-rate-limits.yml
- type: FinOps
  url: finops/google-cloud-kms-finops.yml
- type: CapabilityMap
  url: capabilities/google-cloud-kms-capability-edges.yml
  name: Google Cloud KMS Business Capability Map
- type: Website
  url: https://www.google.com/
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/google-cloud-kms/overview
- type: AgenticAccess
  url: agentic-access/google-cloud-kms-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/google-cloud-kms-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/google-cloud-kms-domain-security.yml
- type: Authentication
  url: authentication/google-cloud-kms-authentication.yml
- type: OAuthScopes
  url: scopes/google-cloud-kms-scopes.yml
- type: GitHubOrganization
  url: https://github.com/googleapis
- type: Portal
  url: https://cloud.google.com/kms
- type: GettingStarted
  url: https://cloud.google.com/kms/docs/quickstart
- type: Documentation
  url: https://cloud.google.com/kms/docs
- type: Authentication
  url: https://cloud.google.com/kms/docs/iam
- type: Pricing
  url: https://cloud.google.com/kms/pricing
- type: TermsOfService
  url: https://cloud.google.com/terms
- type: PrivacyPolicy
  url: https://policies.google.com/privacy
- type: StatusPage
  url: https://status.cloud.google.com/
- type: Support
  url: https://cloud.google.com/kms/docs/support
- type: JSONLDContext
  url: json-ld/context.jsonld
- type: Integrations
  url: https://cloud.google.com/marketplace
integrations:
- name: Become a Partner
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: google-cloud-platform
x-relationship: product

Google Cloud KMS API — frequently asked questions

Does Google Cloud KMS have an API?

Yes. APIs.io lists 3 APIs from Google Cloud KMS, including Google Cloud KMS Crypto Keys API, Google Cloud KMS Crypto Operations API and Google Cloud KMS Key Rings API.

Is there an OpenAPI specification for the Google Cloud KMS API?

Yes. APIs.io indexes 3 OpenAPI specifications for Google Cloud KMS, each linked for download from this page.

How do I authenticate with the Google Cloud KMS API?

Google Cloud KMS documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Google Cloud Kms Authentication.

How much does the Google Cloud KMS API cost?

Google Cloud KMS publishes its prices; its Active key versions — SOFTWARE protection level plan is $0.000082192/ 1 hour per active key version per hour as of 2026-10-28. APIs.io lists 9 pricing plans for Google Cloud KMS, with each plan's price, limits and inclusions under Pricing on this page.

Is the Google Cloud KMS API ready for AI agents?

Google Cloud KMS has a Kin Score of 53.2 out of 100 (developing) and an Agent Readiness score of 24.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
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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