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 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 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.2/100 developing ▬ flat Agent 23/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Entities Google Knowledge Graph Linked Data Schema.org Semantic Search

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 43.2/100 · developing

Contract Quality 15.5 / 25

Developer Ergonomics 8.8 / 20

Access Clarity 7.4 / 20

Operational Transparency 3.1 / 13

Contract Governance 1.6 / 12

Discoverability 6.9 / 10

Agent readiness — 23/100 · 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

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.

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/google-knowledge-graph: 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.

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 3

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

API Collection

OPEN COLLECTION

Google Knowledge Graph Search Entities:search API

OPEN COLLECTION

Google Knowledge Graph Search API

OPEN COLLECTION

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

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 API 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 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

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
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  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: 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

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