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 is listed with 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 engineering blog, documentation, API reference, getting-started guide, pricing, signup flow, CLI, and 30 more developer resources.

🌐 Visit website 📡 Source on GitHub

49.7/100 developing ▬ flat Agent 48/100 agent ready Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

AccessSelf serve

1 API 1 MCP Servers

Company Security Cybersecurity Penetration TestingAutonomous PentestingAttack Surface Management Exposure Management Vulnerability Management GraphQL Offensive Security

Kin Score

Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0

Composite quality — 49.7/100 · developing

Contract Quality 8.3 / 21

Developer Ergonomics 8.4 / 17

Access Clarity 8.1 / 17

Operational Transparency 5.5 / 11

Contract Governance 1.9 / 10

Discoverability 6.4 / 9

Regulatory Posture 6.8 / 15

Agent readiness — 48/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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 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 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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/horizon3ai: 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 →

Standards implemented 1

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.

GraphQL

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

APIs 1

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

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 1

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

Horizon3.ai MCP Server

Horizon3.ai-hosted Model Context Protocol server exposing NodeZero data and actions to MCP-compliant agents. Backs onto the same NodeZero platform as the GraphQL API. Secured wi...

MCP SERVER

Event Specifications 1

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

Horizon3Ai Webhooks

ASYNCAPI

Security Posture 4

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

Horizon3Ai Authentication

apiKey/http-bearer/oauth2 · 3 schemes

SECURITY

Horizon3Ai Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Horizon3Ai Vulnerability Disclosure

contact published

SECURITY

Horizon3Ai Trust Center

FedRAMP High, SOC 2, CMMC 2.0, NIST SP 800-53 Rev. 5

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Horizon3Ai Scopes

2 scopes · authorizationCode

2 scopes

SCOPES

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

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

WellKnown

LLMsTxt

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

ErrorCatalog

Conformance

DataModel

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

Compliance

Security

Authentication

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 4

The organization behind the API

Blog

BlogRSS

Website

Blog

Source (apis.yml)

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.
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: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
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: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
x-docs-platform: mkdocs
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
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:
- url: https://horizon3.ai/resource-center/
  type: Blog
- url: https://horizon3.ai/feed/
  type: BlogRSS
- 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

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