G2

G2 is the world's largest B2B software marketplace, built on more than three million verified peer reviews and used by over 100 million software buyers a year. The G2 API provides programmatic access to G2's product catalog, category taxonomy, vendor records, reviews, badges, Grid reports, buyer intent signals and competitive intelligence. The v2 REST surface is a JSON:API contract of 62 operations served from data.g2.com, alongside a separate Data Solutions API for enriched flat-structure review data and a first-party remote MCP server at mcp.g2.com that exposes 21 tools to AI agents over OAuth 2.0. Authentication is by Developer Portal account token or OAuth 2.0 authorization code with PKCE, and most data surfaces are gated by subscription entitlement.

G2 publishes 2 APIs on the APIs.io network, including Data Solutions API, and 1 more. Tagged areas include B2B, Software Discovery, Software Reviews, Buyer Intent, and Market Intelligence.

The G2 catalog on APIs.io includes 1 event-driven AsyncAPI specification.

G2’s developer surface includes authentication, documentation, developer portal, signup flow, pricing, legal docs, support, and 38 more developer resources.

🌐 Visit website 📡 Source on GitHub

65.6/100 strong ▬ flat Agent 54/100 agent native saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessFreemium

3 APIs 1 MCP Servers 5 Features 4 Use Cases

B2B Software Discovery Software Reviews Buyer Intent Market Intelligence Product Catalog Competitive Intelligence ReviewsData SolutionsMCP

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 65.6/100 · strong

Contract Quality 14.2 / 23

Developer Ergonomics 10.2 / 18

Access Clarity 18.0 / 18

Operational Transparency 5.5 / 12

Contract Governance 2.0 / 11

Discoverability 7.3 / 9

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 54/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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

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.

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/g2: 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 3

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

G2 API

The G2 API provides programmatic access to G2's product, category, and review data. It enables developers to retrieve software product listings, user reviews, category taxonomie...

G2 Data Solutions API

The G2 Data Solutions API returns enriched G2 review data with flat attribute structures, intended for investors, private equity and analytics teams that need product momentum, ...

G2 MCP Server

G2's first-party remote Model Context Protocol server. It exposes 21 tools covering buyer intent signals, competitive intelligence, the product and category catalog, vendor reco...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

G2 MCP Server

G2's first-party remote MCP server. Exposes G2 buyer intent data, competitive intelligence, the product/category catalog and review analytics to MCP clients over OAuth 2.0. Read...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

G2 Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

G2 Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

G2 Finops

FINOPS

Features 5

Notable capabilities this provider offers.

Product Data Access

Retrieve detailed product listings including descriptions, ratings, and competitive positioning.

Review Syndication

Syndicate authenticated user reviews to your own platforms and partner sites.

Category Taxonomy

Access G2's comprehensive software category taxonomy for classification and discovery.

Competitive Intelligence

Compare products side-by-side using G2's crowd-sourced review data.

Buyer Intent Data

Access buyer intent signals showing which companies are researching products in your category.

Event Specifications 1

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

G2 Webhooks

ASYNCAPI

Security Posture 4

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

G2 Authentication

http/oauth2/openIdConnect · 3 schemes

SECURITY

G2 Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

G2 Vulnerability Disclosure

Hackerone

SECURITY

G2 Trust Center

SOC 2 Type 2, SOC 3, CSA STAR

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

G2 Scopes

18 scopes

SCOPES

Use Cases 4

What developers build with this provider.

Review Aggregation

Pull and display G2 reviews on your own website or product pages.

Market Research

Analyze software categories and competitive landscapes using G2's product data.

Sales Intelligence

Leverage buyer intent data to identify prospects actively researching solutions.

Product Comparison

Build comparison tools using G2's product ratings and review data.

Integrations 5

Pre-built integrations with other platforms and tools.

Salesforce

Sync G2 buyer intent data and reviews directly into Salesforce CRM.

HubSpot

Integrate G2 data with HubSpot for marketing and sales workflows.

Slack

Receive notifications about new reviews and buyer intent signals in Slack.

Leverage G2 data for LinkedIn advertising and account targeting.

Marketo

Push G2 buyer intent signals into Marketo for demand generation campaigns.

Resources

Get Started 6

Portal, sign-up, and the first successful call

Portal

Portal

SignUp

SignUp

Login

Sandbox

Sandbox

GettingStarted

GettingStarted

DeveloperPortal

DeveloperPortal

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

OpenAPI

OpenAPI

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

WellKnown

MCPServer

LLMsTxt

AgentSkill

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

Idempotency

Components

DataModel

Webhooks

Scroll for all 8

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

ToolCrosswalk

ToolCrosswalk

Packages

Packages

Access & Security 6

Authentication, authorization, and security posture

OAuthScopes

Authentication

TrustCenter

DomainSecurity

Compliance

VulnerabilityDisclosure

VulnerabilityDisclosure

Operate 4

Status, limits, changes, and where to get help

Support

Contact

ChangeLog

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Legal

Plans

Company 4

The organization behind the API

Website

Website

Blog

Blog

Partners

Partners

LinkedIn

Other 2

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: g2
name: G2
description: G2 is the world's largest B2B software marketplace, built on more than three million verified peer reviews and
  used by over 100 million software buyers a year. The G2 API provides programmatic access to G2's product catalog, category
  taxonomy, vendor records, reviews, badges, Grid reports, buyer intent signals and competitive intelligence. The v2 REST
  surface is a JSON:API contract of 62 operations served from data.g2.com, alongside a separate Data Solutions API for enriched
  flat-structure review data and a first-party remote MCP server at mcp.g2.com that exposes 21 tools to AI agents over OAuth
  2.0. Authentication is by Developer Portal account token or OAuth 2.0 authorization code with PKCE, and most data surfaces
  are gated by subscription entitlement.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/g2.png
access: 3rd-Party
url: https://raw.githubusercontent.com/api-evangelist/g2/refs/heads/main/apis.yml
created: '2026-03-24'
modified: '2026-08-29'
specificationVersion: '0.23'
tags:
- B2B
- Software Discovery
- Software Reviews
- Buyer Intent
- Market Intelligence
- Product Catalog
- Competitive Intelligence
- Reviews
- Data Solutions
- MCP
apis:
- aid: g2:g2-api
  name: G2 API
  description: The G2 API provides programmatic access to G2's product, category, and review data. It enables developers to
    retrieve software product listings, user reviews, category taxonomies, and competitive intelligence data from the world's
    largest B2B software marketplace. The API supports endpoints for products, categories, reviews, and syndication, and uses
    token-based authentication.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://data.g2.com
  humanURL: https://documentation.g2.com/docs/g2-api
  tags:
  - Categories
  - Product
  - Reviews
  - Software Discovery
  tags_raw:
  - Categories
  - Products
  - Reviews
  - Software Discovery
  properties:
  - type: Documentation
    url: https://documentation.g2.com/docs/g2-api
  - type: Portal
    url: https://documentation.g2.com/docs/developer-portal
  - type: GettingStarted
    url: https://documentation.g2.com/docs/g2-api-information
  - type: Integrations
    url: https://documentation.g2.com/docs/integrations
  - type: OpenAPI
    url: openapi/g2-api-v2-openapi.yaml
  - type: Overlay
    url: overlays/g2-api-v2-overlay.yaml
  - type: APIReference
    url: https://data.g2.com/api/v2/docs/index.html
- aid: g2:g2-data-solutions-api
  name: G2 Data Solutions API
  description: The G2 Data Solutions API returns enriched G2 review data with flat attribute structures, intended for investors,
    private equity and analytics teams that need product momentum, comparison and customer-satisfaction signal in a denormalised
    shape rather than as a JSON:API relationship graph. It is published as a separate OpenAPI document from the main G2 v2
    API and is gated behind the G2 Data Solutions add-on.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://data.g2.com
  humanURL: https://data.g2.com/api/v2/docs/index.html
  tags:
  - Data Solutions
  - Reviews
  - Market Intelligence
  - Software Reviews
  properties:
  - type: OpenAPI
    url: openapi/g2-data-solutions-openapi.yaml
  - type: Overlay
    url: overlays/g2-data-solutions-overlay.yaml
  - type: APIReference
    url: https://data.g2.com/api/v2/docs/index.html
  - type: Documentation
    url: https://documentation.g2.com/docs/g2-api
- aid: g2:g2-mcp-server
  name: G2 MCP Server
  description: G2's first-party remote Model Context Protocol server. It exposes 21 tools covering buyer intent signals, competitive
    intelligence, the product and category catalog, vendor records, review analytics and research-board curation to any MCP-compatible
    client over OAuth 2.0 with PKCE. It is a hosted endpoint, not a locally installed package, and it calls the underlying
    G2 v2 API so it inherits the same 100 requests-per-second limit and the same subscription entitlements.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://mcp.g2.com/mcp
  humanURL: https://documentation.g2.com/docs/g2-mcp-server
  tags:
  - MCP
  - Agents
  - Buyer Intent
  - Software Discovery
  properties:
  - type: MCPServer
    url: mcp/g2-mcp.yml
  - type: ToolCrosswalk
    url: mcp/g2-tool-crosswalk.yml
  - type: Documentation
    url: https://documentation.g2.com/docs/g2-mcp-server
common:
- type: Website
  url: https://www.g2.com/
- type: OAuthScopes
  url: scopes/g2-scopes.yml
- type: Authentication
  url: authentication/g2-authentication.yml
- type: TrustCenter
  url: security/g2-trust-center.yml
- type: DomainSecurity
  url: security/g2-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/g2crowd
- type: Documentation
  url: https://documentation.g2.com/docs/g2-api
- type: Portal
  url: https://documentation.g2.com/docs/developer-portal
- type: SignUp
  url: https://www.g2.com/users/sign_up
- type: Login
  url: https://www.g2.com/users/sign_in
- type: Pricing
  url: https://sell.g2.com/plans
- type: TermsOfService
  url: https://legal.g2.com/terms-of-use
- type: PrivacyPolicy
  url: https://legal.g2.com/privacy-policy
- type: Legal
  url: https://legal.g2.com/
- type: Support
  url: https://support.g2.com/s/
- type: Contact
  url: https://company.g2.com/contact
- type: Blog
  url: https://learn.g2.com/
- type: Partners
  url: https://partnerhub.g2.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/g2dotcom
- type: X
  url: https://x.com/G2dotcom
- type: Features
  data:
  - name: Product Data Access
    description: Retrieve detailed product listings including descriptions, ratings, and competitive positioning.
  - name: Review Syndication
    description: Syndicate authenticated user reviews to your own platforms and partner sites.
  - name: Category Taxonomy
    description: Access G2's comprehensive software category taxonomy for classification and discovery.
  - name: Competitive Intelligence
    description: Compare products side-by-side using G2's crowd-sourced review data.
  - name: Buyer Intent Data
    description: Access buyer intent signals showing which companies are researching products in your category.
- type: UseCases
  data:
  - name: Review Aggregation
    description: Pull and display G2 reviews on your own website or product pages.
  - name: Market Research
    description: Analyze software categories and competitive landscapes using G2's product data.
  - name: Sales Intelligence
    description: Leverage buyer intent data to identify prospects actively researching solutions.
  - name: Product Comparison
    description: Build comparison tools using G2's product ratings and review data.
- type: Integrations
  data:
  - name: Salesforce
    description: Sync G2 buyer intent data and reviews directly into Salesforce CRM.
  - name: HubSpot
    description: Integrate G2 data with HubSpot for marketing and sales workflows.
  - name: Slack
    description: Receive notifications about new reviews and buyer intent signals in Slack.
  - name: LinkedIn
    description: Leverage G2 data for LinkedIn advertising and account targeting.
  - name: Marketo
    description: Push G2 buyer intent signals into Marketo for demand generation campaigns.
- type: OpenAPI
  url: openapi/g2-api-v2-openapi.yaml
- type: Overlay
  url: overlays/g2-api-v2-overlay.yaml
- type: WellKnown
  url: well-known/g2-well-known.yml
- type: MCPServer
  url: mcp/g2-mcp.yml
- type: ToolCrosswalk
  url: mcp/g2-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/g2-llms.txt
- type: Conformance
  url: conformance/g2-conformance.yml
- type: Compliance
  url: conformance/g2-conformance.yml
- type: ErrorCatalog
  url: errors/g2-problem-types.yml
- type: Lifecycle
  url: lifecycle/g2-lifecycle.yml
- type: Sandbox
  url: sandbox/g2-sandbox.yml
- type: Conventions
  url: conventions/g2-conventions.yml
- type: Idempotency
  url: conventions/g2-conventions.yml
- type: ChangeLog
  url: changelog/g2-changelog.yml
- type: Components
  url: components/g2-components.yml
- type: DataModel
  url: data-model/g2-data-model.yml
- type: Webhooks
  url: asyncapi/g2-webhooks.yml
- type: Packages
  url: packages/g2-packages.yml
- type: AgentSkill
  url: skills/_index.yml
- type: RateLimits
  url: rate-limits/g2-rate-limits.yml
- type: Plans
  url: plans/g2-plans-pricing.yml
- type: VulnerabilityDisclosure
  url: security/g2-vulnerability-disclosure.yml
- type: GettingStarted
  url: https://documentation.g2.com/docs/g2-api-information
- type: DeveloperPortal
  url: https://my.g2.com/developers
- type: APIReference
  url: https://data.g2.com/api/v2/docs/index.html
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-29'
  status: enriched
  artifacts_added: 30
  pass: local-v1

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