Google reCAPTCHA

Google reCAPTCHA is a security service that protects websites and applications from spam and abuse by verifying that interactions are from real humans rather than bots, offering Enterprise and standard APIs for site verification and risk assessment.

Google reCAPTCHA publishes 3 API contracts indexed on the APIs.io network, including Assessments API, Keys API, and 1 more. Tagged areas include Abuse Prevention, Bot Detection, CAPTCHA, Fraud Prevention, and Google Cloud.

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

Google reCAPTCHA’s developer surface includes authentication, getting-started guide, pricing, developer console, support, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

48.1/100 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

Abuse Prevention Bot Detection CAPTCHA Fraud Prevention Google Cloud 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

Assessments

POST /projects/{projectId}/assessments

Kin Score

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

Composite quality — 48.1/100 · developing

Contract Quality 10.7 / 19

Developer Ergonomics 7.0 / 15

Access Clarity 7.5 / 15

Operational Transparency 3.6 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 4.9 / 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 Governance scores 9.8 — up to +10.8 composite points
Developer Ergonomics scores 46.4 — up to +10.7 composite points
Contract Quality scores 57.3 — up to +10.7 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-recaptcha/apis.yml: open an issue on github.com/api-evangelist/google-recaptcha 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.

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.

reCAPTCHA Site Verify API

The reCAPTCHA Site Verify API is the standard verification endpoint for reCAPTCHA v2 and v3 tokens. After a user completes a reCAPTCHA challenge on the frontend, the backend sen...

Google reCAPTCHA Assessments API

Create and annotate risk assessments

Google reCAPTCHA Keys API

Manage reCAPTCHA site keys

Postman Collections 2

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

Google reCAPTCHA reCAPTCHA Enterprise Assessments API

POSTMAN

Google reCAPTCHA reCAPTCHA Enterprise Assessments Keys API

POSTMAN

Open Collections 3

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

Google reCAPTCHA reCAPTCHA Enterprise Assessments API

OPEN COLLECTION

Google reCAPTCHA reCAPTCHA Enterprise Assessments Keys API

OPEN COLLECTION

Google reCAPTCHA reCAPTCHA Enterprise API

OPEN COLLECTION

Google reCAPTCHA API pricing

Prices published by Google reCAPTCHA, read 2026-10-28 from cloud.google.com/security/products/recaptcha#pricing. A free plan or tier is listed.

Plan	Price
reCAPTCHA Essentials	Free up to 10,000 assessments Includes: 10,000 assessments per organization
reCAPTCHA Premium	10,001 - 100,000 assessments: $8.00 flat fee Includes: 1 - 10,000 assessments: Free
reCAPTCHA Enterprise	Fixed monthly volume commitment at $1 per 1,000 assessments.

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 reCAPTCHA's documentation. All 5 limits →

Billed by: assessments · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Google Recaptcha Plans Pricing

3 plans

PLANS

Google Recaptcha Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Google Recaptcha 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 reCAPTCHA

SLA

FinOps 1

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

Google Recaptcha Finops

FINOPS

Semantic Vocabularies 1

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

Google Recaptcha Context

0 classes · 3 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Google reCAPTCHA — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 1

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

reCAPTCHA Enterprise Assessment

4 properties

JSON SCHEMA

Security Posture 3

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

Google Recaptcha Authentication

oauth2 · 1 scheme

SECURITY

Google Recaptcha Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Google Recaptcha Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Google Recaptcha Scopes

1 scope · authorizationCode

1 scopes

SCOPES

Agentic Access 1

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

Google Recaptcha Agentic Access

6 operations · 4 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Console

Console

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 3

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

GitHubOrganization

SDKs

SDKs

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

Support

Support

StatusPage

StatusPage

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

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: google-recaptcha
name: Google reCAPTCHA
description: Google reCAPTCHA is a security service that protects websites and applications from spam and abuse by verifying
  that interactions are from real humans rather than bots, offering Enterprise and standard APIs for site verification and
  risk assessment.
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-recaptcha.png
url: https://raw.githubusercontent.com/api-evangelist/google-recaptcha/refs/heads/main/apis.yml
created: '2026-03-13'
modified: '2026-05-19'
specificationVersion: '0.23'
type: Index
tags:
- Abuse Prevention
- Bot Detection
- CAPTCHA
- Fraud Prevention
- Google Cloud
- Security
apis:
- name: reCAPTCHA Site Verify API
  description: The reCAPTCHA Site Verify API is the standard verification endpoint for reCAPTCHA v2 and v3 tokens. After a
    user completes a reCAPTCHA challenge on the frontend, the backend sends the response token to this API to verify the interaction.
    The API returns whether the verification succeeded, a score (for v3), the action name, and the hostname.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.google.com/recaptcha/docs/verify
  baseURL: https://www.google.com/recaptcha/api
  tags:
  - reCAPTCHA V3
  - Token Validation
  - Verification
  properties:
  - type: Documentation
    url: https://developers.google.com/recaptcha/docs/verify
- aid: google-recaptcha:google-recaptcha-assessments-api
  name: Google reCAPTCHA Assessments API
  description: Create and annotate risk assessments
  humanURL: https://cloud.google.com/recaptcha-enterprise/docs
  baseURL: https://recaptchaenterprise.googleapis.com
  tags:
  - Assessment
  tags_raw:
  - Assessments
  properties:
  - type: OpenAPI
    url: openapi/google-recaptcha-assessments-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/recaptcha-enterprise/docs/reference/rest
  - type: JSONSchema
    url: json-schema/google-recaptcha-assessment-schema.json
- aid: google-recaptcha:google-recaptcha-keys-api
  name: Google reCAPTCHA Keys API
  description: Manage reCAPTCHA site keys
  humanURL: https://cloud.google.com/recaptcha-enterprise/docs
  baseURL: https://recaptchaenterprise.googleapis.com
  tags:
  - Keys
  properties:
  - type: OpenAPI
    url: openapi/google-recaptcha-keys-api-openapi.yml
  - type: Documentation
    url: https://cloud.google.com/recaptcha-enterprise/docs/reference/rest
  - type: JSONSchema
    url: json-schema/google-recaptcha-assessment-schema.json
common:
- type: Plans
  url: plans/google-recaptcha-plans-pricing.yml
- type: RateLimits
  url: rate-limits/google-recaptcha-rate-limits.yml
- type: FinOps
  url: finops/google-recaptcha-finops.yml
- type: CapabilityMap
  url: capabilities/google-recaptcha-capability-edges.yml
  name: Google reCAPTCHA Business Capability Map
- type: Website
  url: https://www.google.com/
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/google-recaptcha/overview
- type: AgenticAccess
  url: agentic-access/google-recaptcha-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/google-recaptcha-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/google-recaptcha-domain-security.yml
- type: Authentication
  url: authentication/google-recaptcha-authentication.yml
- type: OAuthScopes
  url: scopes/google-recaptcha-scopes.yml
- type: GitHubOrganization
  url: https://github.com/google
- type: GettingStarted
  url: https://cloud.google.com/recaptcha-enterprise/docs/getting-started
- type: Pricing
  url: https://cloud.google.com/recaptcha-enterprise/pricing
- type: Authentication
  url: https://cloud.google.com/recaptcha-enterprise/docs/authentication
- type: Console
  url: https://console.cloud.google.com/security/recaptcha
- type: SDKs
  url: https://cloud.google.com/recaptcha-enterprise/docs/libraries
- type: Support
  url: https://cloud.google.com/recaptcha-enterprise/docs/support
- type: StatusPage
  url: https://status.cloud.google.com
- type: JSONLD
  url: json-ld/google-recaptcha-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
x-relationship: product

Google reCAPTCHA API — frequently asked questions

Does Google reCAPTCHA have an API?

Yes. APIs.io lists 3 APIs from Google reCAPTCHA, including reCAPTCHA Site Verify API, Google reCAPTCHA Assessments API and Google reCAPTCHA Keys API.

Is there an OpenAPI specification for the Google reCAPTCHA API?

Yes. APIs.io indexes 2 OpenAPI specifications for Google reCAPTCHA, each linked for download from this page.

How do I authenticate with the Google reCAPTCHA API?

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

How much does the Google reCAPTCHA API cost?

Google reCAPTCHA publishes its prices; its reCAPTCHA Essentials plan is Free up to 10,000 assessments as of 2026-10-28. APIs.io lists 3 pricing plans for Google reCAPTCHA, with each plan's price, limits and inclusions under Pricing on this page.

Is the Google reCAPTCHA API ready for AI agents?

Google reCAPTCHA has a Kin Score of 48.1 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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