Horizon3.ai

Horizon3.ai is a cybersecurity company whose NodeZero platform delivers autonomous penetration testing and continuous security posture management. NodeZero safely attacks your internal, external, cloud, and hybrid environments the way a real adversary would, proving exploitable attack paths, prioritizing the fixes that matter, and verifying that remediations actually work. Horizon3.ai exposes a publicly documented GraphQL API (the NodeZero API) plus an h3-cli command-line tool and a hosted Model Context Protocol (MCP) server, letting teams schedule pentests, retrieve findings, weaknesses, attack paths, credentials, and host inventory, and wire results into CI/CD, ticketing (Jira, ServiceNow), and agentic workflows. NodeZero Federal is FedRAMP High authorized for public-sector use.

Horizon3.ai publishes 1 API on the APIs.io network. Tagged areas include Company, Security, Cybersecurity, Penetration Testing, and Autonomous Pentesting.

The Horizon3.ai catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Horizon3.ai’s developer surface includes documentation, API reference, getting-started guide, engineering blog, pricing, signup flow, CLI, and 28 more developer resources.

🌐 Visit website 📡 Source on GitHub
43.1/100 thin Agent 43/100 agent aware Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanySecurityCybersecurityPenetration TestingAutonomous PentestingAttack Surface ManagementExposure ManagementVulnerability ManagementGraphQLOffensive Security

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 43.1/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 13.9 / 20
Commercial Clarity 12.1 / 20
Operational Transparency 7.9 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 43/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/horizon3ai: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

NodeZero GraphQL API

The NodeZero API is a publicly accessible GraphQL API that exposes a subset of the Horizon3.ai Portal: schedule and control autonomous pentest operations, and read pentests, ops...

MCP Servers

horizon3ai-mcp.yml

MCP SERVER

Event Specifications

Horizon3Ai Webhooks

ASYNCAPI

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 GraphQL
GraphQL

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 WellKnown
WellKnown
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Lifecycle
Lifecycle
 Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 DataModel
DataModel
 Webhooks
Webhooks

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 CLI
CLI
 Packages
Packages

Access & Security 7

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 Compliance
Compliance
 Security
Security
 Authentication
Authentication
 OAuthScopes
OAuthScopes
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity

Scroll for all 7

Operate 3

Status, limits, changes, and where to get help

Roadmap
Roadmap
 StatusPage
StatusPage
 ChangeLog
ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: horizon3ai
name: Horizon3.ai
description: Horizon3.ai is a cybersecurity company whose NodeZero platform delivers autonomous penetration testing and continuous
  security posture management. NodeZero safely attacks your internal, external, cloud, and hybrid environments the way a real
  adversary would, proving exploitable attack paths, prioritizing the fixes that matter, and verifying that remediations actually
  work. Horizon3.ai exposes a publicly documented GraphQL API (the NodeZero API) plus an h3-cli command-line tool and a hosted
  Model Context Protocol (MCP) server, letting teams schedule pentests, retrieve findings, weaknesses, attack paths, credentials,
  and host inventory, and wire results into CI/CD, ticketing (Jira, ServiceNow), and agentic workflows. NodeZero Federal is
  FedRAMP High authorized for public-sector use.
image: https://www.horizon3.ai/wp-content/uploads/2023/08/1200x627-NodeZero-UI_Sankey.jpg
url: https://raw.githubusercontent.com/api-evangelist/horizon3ai/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- craft-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Security
- Cybersecurity
- Penetration Testing
- Autonomous Pentesting
- Attack Surface Management
- Exposure Management
- Vulnerability Management
- GraphQL
- Offensive Security
apis:
- name: NodeZero GraphQL API
  description: 'The NodeZero API is a publicly accessible GraphQL API that exposes a subset of the Horizon3.ai Portal: schedule
    and control autonomous pentest operations, and read pentests, ops, weaknesses, attack paths, credentials, hosts, asset
    groups, schedules, and downloadable reports. Authentication is via an API key exchanged for a short-lived JWT bearer token.'
  humanURL: https://docs.horizon3.ai/api/
  baseURL: https://api.gateway.horizon3ai.com/v1/graphql
  tags:
  - GraphQL
  - Penetration Testing
  - Security
  properties:
  - type: GraphQL
    url: https://api.gateway.horizon3ai.com/v1/graphql
  - type: APIReference
    url: https://docs.horizon3.ai/api/graphql/
  - type: GettingStarted
    url: https://docs.horizon3.ai/api/getting_started/
  - type: Authentication
    url: https://docs.horizon3.ai/api/getting_started/authenticate/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://horizon3.ai
- type: DeveloperPortal
  url: https://portal.horizon3ai.com
- type: Documentation
  url: https://docs.horizon3.ai/
- type: APIReference
  url: https://docs.horizon3.ai/api/graphql/
- type: GettingStarted
  url: https://docs.horizon3.ai/api/getting_started/
- type: GraphQL
  url: https://api.gateway.horizon3ai.com/v1/graphql
- type: Blog
  url: https://horizon3.ai/intelligence/blogs/
- type: GitHubOrganization
  url: https://github.com/horizon3ai
- type: Roadmap
  url: https://horizon3.ai/roadmap/
- type: StatusPage
  url: https://status.horizon3.ai
- type: Pricing
  url: https://horizon3.ai/use-case/packaging/
- type: SignUp
  url: https://portal.horizon3ai.com
- type: Login
  url: https://portal.horizon3ai.com
- type: TermsOfService
  url: https://horizon3.ai/terms-of-service/
- type: PrivacyPolicy
  url: https://horizon3.ai/privacy-policy/
- type: TrustCenter
  url: https://trust.horizon3.ai/
- type: Compliance
  url: https://horizon3.ai/compliance/
- type: Security
  url: https://horizon3.ai/vulnerability-disclosure-policy/
- type: MCPServer
  url: mcp/horizon3ai-mcp.yml
- type: CLI
  url: cli/horizon3ai-cli.yml
- type: Packages
  url: packages/horizon3ai-packages.yml
- type: Authentication
  url: authentication/horizon3ai-authentication.yml
- type: OAuthScopes
  url: scopes/horizon3ai-scopes.yml
- type: WellKnown
  url: well-known/horizon3ai-well-known.yml
- type: ChangeLog
  url: changelog/horizon3ai-changelog.yml
- type: Lifecycle
  url: lifecycle/horizon3ai-lifecycle.yml
- type: Conventions
  url: conventions/horizon3ai-conventions.yml
- type: ErrorCatalog
  url: errors/horizon3ai-problem-types.yml
- type: Conformance
  url: conformance/horizon3ai-conformance.yml
- type: DataModel
  url: data-model/horizon3ai-data-model.yml
- type: Webhooks
  url: asyncapi/horizon3ai-webhooks.yml
- type: VulnerabilityDisclosure
  url: security/horizon3ai-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/horizon3ai-domain-security.yml
- type: LLMsTxt
  url: llms/horizon3ai-llms.txt
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence