Google Cloud Pub/Sub

Google Cloud Pub/Sub is a fully managed, real-time messaging service that allows you to send and receive messages between independent applications. It provides reliable, many-to-many, asynchronous messaging that decouples senders and receivers.

Google Cloud Pub/Sub publishes 3 API contracts indexed on the APIs.io network: Schemas API, Subscriptions API, and Topics API. Tagged areas include Event-Driven, Google Cloud, Messaging, and Pub/Sub.

The Google Cloud Pub/Sub catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 2 Spectral governance rulesets.

Google Cloud Pub/Sub’s developer surface includes authentication, getting-started guide, pricing, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.7/100 thin ▬ flat Agent 26/100 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

Event-Driven Google Cloud Messaging Pub/Sub

Kin Score

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

Composite quality — 38.7/100 · thin

Contract Quality 12.3 / 19

Developer Ergonomics 5.0 / 15

Access Clarity 2.8 / 15

Operational Transparency 2.1 / 10

Contract Governance 1.2 / 9

Discoverability 4.3 / 8

Regulatory Posture 4.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · 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 6 / 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

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 33.3 — up to +13.3 composite points
Contract Governance scores 13.6 — up to +10.4 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-pubsub/apis.yml: open an issue on github.com/api-evangelist/google-cloud-pubsub 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
Streaming (Apache Kafka protocol)	covered	19.4 (thin)	-	-

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 3

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.

Pub/Sub

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

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 Pub/Sub Schemas API

Operations for managing Pub/Sub schemas

Google Cloud Pub/Sub Subscriptions API

Operations for managing Pub/Sub subscriptions

Google Cloud Pub/Sub Topics API

Operations for managing Pub/Sub topics

Open Collections 4

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

Google Cloud Pub/Sub Schemas API

OPEN COLLECTION

Google Cloud Pub/Sub Schemas Subscriptions API

OPEN COLLECTION

Google Cloud Pub/Sub Schemas Topics API

OPEN COLLECTION

Google Cloud Pub/Sub API

OPEN COLLECTION

Google Cloud Pub/Sub API pricing

Not yet checked against Google Cloud Pub/Sub'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 Cloud Pub/Sub's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Google Cloud Pubsub Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Google Cloud Pubsub 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 Pub/Sub

SLA

FinOps 1

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

Google Cloud Pubsub Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Google Cloud Pub/Sub Messaging Surface

Google Cloud Pub/Sub is a fully managed, real-time messaging service for sending and receiving messages between independent applications. This AsyncAPI document describes Pub/Su...

ASYNCAPI

Semantic Vocabularies 1

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

Google Cloud Pubsub Context

15 classes · 1 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Google Cloud Pub/Sub — asyncapi rules

8 rules · 1 errors 6 warnings 1 info

SPECTRAL

Google Cloud Pub/Sub — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 1

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

Google Cloud Pub/Sub Topic

7 properties

JSON SCHEMA

Security Posture 3

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

Google Cloud Pubsub Authentication

oauth2 · 1 scheme

SECURITY

Google Cloud Pubsub Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Google Cloud Pubsub Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Google Cloud Pubsub Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Agentic Access 1

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

Google Cloud Pubsub Agentic Access

13 operations · 8 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

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

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Pricing

Pricing

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

name: Google Cloud Pub/Sub
description: Google Cloud Pub/Sub is a fully managed, real-time messaging service that allows you to send and receive messages
  between independent applications. It provides reliable, many-to-many, asynchronous messaging that decouples senders and
  receivers.
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-cloud-pubsub.png
url: https://raw.githubusercontent.com/api-evangelist/google-cloud-pubsub/refs/heads/main/apis.yml
created: '2026-03-13'
modified: '2026-05-30'
specificationVersion: '0.23'
tags:
- Event-Driven
- Google Cloud
- Messaging
- Pub/Sub
tags_raw:
- Event-Driven
- Google Cloud
- Messaging
- Pub/Sub
apis:
- aid: google-cloud-pubsub:google-cloud-pubsub-schemas-api
  name: Google Cloud Pub/Sub Schemas API
  description: Operations for managing Pub/Sub schemas
  humanURL: https://cloud.google.com/pubsub/docs
  baseURL: https://pubsub.googleapis.com
  tags:
  - Schema
  tags_raw:
  - Schemas
  properties:
  - type: OpenAPI
    url: openapi/google-cloud-pubsub-schemas-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/pubsub/docs/reference/rest
  - type: AsyncAPI
    url: asyncapi/google-cloud-pubsub-asyncapi.yml
  - type: JSONSchema
    url: json-schema/google-cloud-pubsub-topic-schema.json
- aid: google-cloud-pubsub:google-cloud-pubsub-subscriptions-api
  name: Google Cloud Pub/Sub Subscriptions API
  description: Operations for managing Pub/Sub subscriptions
  humanURL: https://cloud.google.com/pubsub/docs
  baseURL: https://pubsub.googleapis.com
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/google-cloud-pubsub-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/pubsub/docs/reference/rest
  - type: AsyncAPI
    url: asyncapi/google-cloud-pubsub-asyncapi.yml
  - type: JSONSchema
    url: json-schema/google-cloud-pubsub-topic-schema.json
- aid: google-cloud-pubsub:google-cloud-pubsub-topics-api
  name: Google Cloud Pub/Sub Topics API
  description: Operations for managing Pub/Sub topics
  humanURL: https://cloud.google.com/pubsub/docs
  baseURL: https://pubsub.googleapis.com
  tags:
  - Topic
  tags_raw:
  - Topics
  properties:
  - type: OpenAPI
    url: openapi/google-cloud-pubsub-topics-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/pubsub/docs/reference/rest
  - type: AsyncAPI
    url: asyncapi/google-cloud-pubsub-asyncapi.yml
  - type: JSONSchema
    url: json-schema/google-cloud-pubsub-topic-schema.json
common:
- type: Plans
  url: plans/google-cloud-pubsub-plans-pricing.yml
- type: RateLimits
  url: rate-limits/google-cloud-pubsub-rate-limits.yml
- type: FinOps
  url: finops/google-cloud-pubsub-finops.yml
- type: Website
  url: https://www.google.com/
- type: AgenticAccess
  url: agentic-access/google-cloud-pubsub-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/google-cloud-pubsub-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/google-cloud-pubsub-domain-security.yml
- type: Authentication
  url: authentication/google-cloud-pubsub-authentication.yml
- type: OAuthScopes
  url: scopes/google-cloud-pubsub-scopes.yml
- type: GitHubOrganization
  url: https://github.com/GoogleCloudPlatform
- type: GettingStarted
  url: https://cloud.google.com/pubsub/docs/quickstarts
- type: Pricing
  url: https://cloud.google.com/pubsub/pricing
- type: JSONLD
  url: json-ld/google-cloud-pubsub-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 Pub/Sub API — frequently asked questions

Does Google Cloud Pub/Sub have an API?

Yes. APIs.io lists 3 APIs from Google Cloud Pub/Sub, including Google Cloud Pub/Sub Schemas API, Google Cloud Pub/Sub Subscriptions API and Google Cloud Pub/Sub Topics API.

Is there an OpenAPI specification for the Google Cloud Pub/Sub API?

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

How do I authenticate with the Google Cloud Pub/Sub API?

Google Cloud Pub/Sub documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Google Cloud Pubsub Authentication.

How much does the Google Cloud Pub/Sub API cost?

APIs.io lists 3 pricing plans for Google Cloud Pub/Sub, with each plan's price, limits and inclusions under Pricing on this page.

Is the Google Cloud Pub/Sub API ready for AI agents?

Google Cloud Pub/Sub has a Kin Score of 38.7 out of 100 (thin) and an Agent Readiness score of 25.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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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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