Google Knowledge Graph Search

The Google Knowledge Graph Search API allows developers to search for entities (people, places, things) in the Google Knowledge Graph and retrieve structured data about them in JSON-LD format conforming to schema.org standards. Results include names, descriptions, images, and detailed descriptions with relevance scoring.

Google Knowledge Graph Search publishes 1 API contract indexed on the APIs.io network: Entities:search API. Tagged areas include Entities, Google, Knowledge Graph, Linked Data, and Schema.org.

The Google Knowledge Graph Search catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Google Knowledge Graph Search’s developer surface includes authentication, developer portal, getting-started guide, documentation, support, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

43.6/100 developing ▬ flat Agent 21/100 agent aware saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Entities Google Knowledge Graph Linked Data Schema.org Semantic Search

Kin Score

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

Composite quality — 43.6/100 · developing

Contract Quality 12.0 / 21

Developer Ergonomics 7.5 / 17

Access Clarity 4.9 / 17

Operational Transparency 3.8 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.6 / 15

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 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 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
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
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)

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 28.9 — up to +14.2 composite points
Developer Ergonomics scores 44.0 — up to +11.2 composite points
Contract Quality scores 56.3 — up to +10.9 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-knowledge-graph/apis.yml: open an issue on github.com/api-evangelist/google-knowledge-graph 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 →

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.

Schema.org

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.

Google Knowledge Graph Search Entities:search API

The Entities:search API from Google Knowledge Graph Search — 1 operation(s) for entities:search.

Postman Collections 1

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

Google Knowledge Graph Search Entities:search API

POSTMAN

Open Collections 2

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

Google Knowledge Graph Search Entities:search API

OPEN COLLECTION

Google Knowledge Graph Search API

OPEN COLLECTION

Google Knowledge Graph Search API pricing

Not yet checked against Google Knowledge Graph Search's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, 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 Knowledge Graph Search's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Google Knowledge Graph Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Google Knowledge Graph 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 Knowledge Graph Search

SLA

FinOps 1

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

Google Knowledge Graph Finops

FINOPS

Semantic Vocabularies 1

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

context Context

14 classes · 0 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Google Knowledge Graph Search — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

Google Knowledge Graph Search API Rules

16 rules · 10 errors 5 warnings 1 info

SPECTRAL

JSON Schema 1

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

Google Knowledge Graph Entity

7 properties

JSON SCHEMA

Security Posture 3

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

Google Knowledge Graph Authentication

apiKey · 1 scheme

SECURITY

Google Knowledge Graph Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Google Knowledge Graph Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Google Knowledge Graph Agentic Access

1 operation

1 operations · 0 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

JSONLD

JSONLD

Build 1

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: google-knowledge-graph
name: Google Knowledge Graph Search
description: The Google Knowledge Graph Search API allows developers to search for entities (people, places, things) in the
  Google Knowledge Graph and retrieve structured data about them in JSON-LD format conforming to schema.org standards. Results
  include names, descriptions, images, and detailed descriptions with relevance scoring.
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · 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-knowledge-graph.png
url: https://raw.githubusercontent.com/api-evangelist/google-knowledge-graph/refs/heads/main/apis.yml
created: '2026-03-13'
modified: '2026-05-19'
specificationVersion: '0.23'
type: Index
tags:
- Entities
- Google
- Knowledge Graph
- Linked Data
- Schema.org
- Semantic Search
apis:
- aid: google-knowledge-graph:google-knowledge-graph-entities-search-api
  name: Google Knowledge Graph Search Entities:search API
  description: The Entities:search API from Google Knowledge Graph Search — 1 operation(s) for entities:search.
  humanURL: https://developers.google.com/knowledge-graph
  baseURL: https://kgsearch.googleapis.com/v1
  tags:
  - Entities:search
  properties:
  - type: OpenAPI
    url: openapi/google-knowledge-graph-entities-search-api-openapi.yml
  - type: Documentation
    url: https://developers.google.com/knowledge-graph/reference/rest/v1
  - type: Authentication
    url: https://developers.google.com/knowledge-graph/how-tos/authorizing
  - type: GettingStarted
    url: https://developers.google.com/knowledge-graph/how-tos/search-widget
  - type: JSONSchema
    url: json-schema/Entity.json
  - type: SpectralRules
    url: rules/google-knowledge-graph-spectral-rules.yml
common:
- type: Plans
  url: plans/google-knowledge-graph-plans-pricing.yml
- type: RateLimits
  url: rate-limits/google-knowledge-graph-rate-limits.yml
- type: FinOps
  url: finops/google-knowledge-graph-finops.yml
- type: Website
  url: https://www.google.com/
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/google-knowledge-graph-search/overview
- type: AgenticAccess
  url: agentic-access/google-knowledge-graph-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/google-knowledge-graph-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/google-knowledge-graph-domain-security.yml
- type: Authentication
  url: authentication/google-knowledge-graph-authentication.yml
- type: Portal
  url: https://developers.google.com/knowledge-graph
- type: GettingStarted
  url: https://developers.google.com/knowledge-graph/how-tos/search-widget
- type: Documentation
  url: https://developers.google.com/knowledge-graph
- type: Authentication
  url: https://developers.google.com/knowledge-graph/how-tos/authorizing
- type: TermsOfService
  url: https://developers.google.com/terms
- type: PrivacyPolicy
  url: https://policies.google.com/privacy
- type: StatusPage
  url: https://status.cloud.google.com/
- type: Support
  url: https://developers.google.com/knowledge-graph/support
- type: JSONLD
  url: json-ld/context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: google
x-relationship: product

Google Knowledge Graph Search API — frequently asked questions

Does Google Knowledge Graph Search have an API?

Yes. APIs.io lists 1 API from Google Knowledge Graph Search, including Google Knowledge Graph Search Entities:search API.

Is there an OpenAPI specification for the Google Knowledge Graph Search API?

Yes. APIs.io indexes 1 OpenAPI specification for Google Knowledge Graph Search, each linked for download from this page.

How do I authenticate with the Google Knowledge Graph Search API?

Google Knowledge Graph Search uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Google Knowledge Graph Authentication.

How much does the Google Knowledge Graph Search API cost?

APIs.io lists 3 pricing plans for Google Knowledge Graph Search, with each plan's price, limits and inclusions under Pricing on this page.

Is the Google Knowledge Graph Search API ready for AI agents?

Google Knowledge Graph Search has a Kin Score of 43.6 out of 100 (developing) and an Agent Readiness score of 20.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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