Nebula Security

Nebula Security is an AI-native cybersecurity company backed by Y Combinator (S26) and founded by world-class hackers — members of a top CTF team, DEF CON winners, Black Hat speakers, and cybersecurity PhDs. Its product, Vega, is an AI security agent that audits codebases for vulnerabilities on the Vega backend, alongside human-led product security auditing. Vega runs from the terminal via the Vega CLI (`vega`), which is distributed as an installable Agent Skill and an npm/global binary, authenticates with an API key or OAuth login, and exposes a project → repository → scan → finding drill-down. The team publishes vulnerability research (e.g. an nginx RCE, CVE-2026-42530) and positions "Audited by Nebula Security" as a product credibility marker.

Nebula Security is profiled on the APIs.io network. Tagged areas include Company, Security, Cybersecurity, Vulnerability Management, and Application Security.

Nebula Security’s developer surface includes engineering blog, documentation, API reference, getting-started guide, support, CLI, authentication, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.9/100 emerging ▬ flat Agent 9/100 agent aware Front door AI 4/6 moderate Heartbeat 95/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs 1 Agent Skills

Company Security Cybersecurity Vulnerability Management Application Security Code Scanning Artificial Intelligence Developer Tools CLI

Kin Score

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

Composite quality — 22.9/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 10.5 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 4.7 / 9

Regulatory Posture 2.7 / 15

Agent readiness — 9/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 0 / 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 0 / 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 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 21.1 — up to +15.8 composite points
Operational Transparency scores 2.6 — up to +12.7 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/nebula-security/apis.yml: open an issue on github.com/api-evangelist/nebula-security 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
Agent Skills (SKILL.md packages)	undeclared	-	-	1

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 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.

Agent Skills

measured — observed by APIs.io (published)

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

vega-cli

AGENT SKILL

Security Posture 2

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

Nebula Security Authentication

apiKey/oauth2 · 2 schemes

SECURITY

Nebula Security Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

ErrorCatalog

ErrorCatalog

DataModel

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

CLI

CLI

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 5

The organization behind the API

Website

About

Blog

Twitter

LinkedIn

Source (apis.yml)

aid: nebula-security
name: Nebula Security
description: Nebula Security is an AI-native cybersecurity company backed by Y Combinator (S26) and founded by world-class
  hackers — members of a top CTF team, DEF CON winners, Black Hat speakers, and cybersecurity PhDs. Its product, Vega, is
  an AI security agent that audits codebases for vulnerabilities on the Vega backend, alongside human-led product security
  auditing. Vega runs from the terminal via the Vega CLI (`vega`), which is distributed as an installable Agent Skill and
  an npm/global binary, authenticates with an API key or OAuth login, and exposes a project → repository → scan → finding
  drill-down. The team publishes vulnerability research (e.g. an nginx RCE, CVE-2026-42530) and positions "Audited by Nebula
  Security" as a product credibility marker.
url: https://raw.githubusercontent.com/api-evangelist/nebula-security/refs/heads/main/apis.yml
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: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://nebusec.ai/nebusec-social.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Security
- Cybersecurity
- Vulnerability Management
- Application Security
- Code Scanning
- Artificial Intelligence
- Developer Tools
- CLI
apis: []
common:
- type: DomainSecurity
  url: security/nebula-security-domain-security.yml
- type: Website
  url: https://nebusec.ai
- type: About
  url: https://nebusec.ai/about
- type: Blog
  url: https://nebusec.ai/research
- type: Documentation
  url: https://github.com/NebuSec/vega-skill/blob/main/README.md
- type: APIReference
  url: https://github.com/NebuSec/vega-skill/blob/main/skills/vega-cli/SKILL.md
- type: GettingStarted
  url: https://github.com/NebuSec/vega-skill#getting-started
- type: GitHubOrganization
  url: https://github.com/NebuSec
- type: Support
  url: mailto:info@nebusec.ai
- type: TermsOfService
  url: https://nebusec.ai/terms/
- type: PrivacyPolicy
  url: https://nebusec.ai/privacy/
- type: Twitter
  url: https://x.com/nebusecurity
- type: LinkedIn
  url: https://www.linkedin.com/company/125323912/
- type: AgentSkill
  name: Vega CLI Agent Skill
  url: skills/nebula-security-vega-cli.md
- type: CLI
  url: cli/nebula-security-cli.yml
- type: Packages
  url: packages/nebula-security-packages.yml
- type: Authentication
  url: authentication/nebula-security-authentication.yml
- type: Conventions
  url: conventions/nebula-security-conventions.yml
- type: ErrorCatalog
  url: errors/nebula-security-error-codes.yml
- type: DataModel
  url: data-model/nebula-security-data-model.yml
- type: WellKnown
  url: well-known/nebula-security-well-known.yml
- type: LLMsTxt
  url: llms/nebula-security-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 11
  pass: local-v1

Nebula Security API — frequently asked questions

How do I authenticate with the Nebula Security API?

Nebula Security uses bearer-token authentication (apiKey/oauth2 · 2 schemes). The details are profiled on APIs.io as Nebula Security Authentication.

Is the Nebula Security API ready for AI agents?

Nebula Security has a Kin Score of 22.9 out of 100 (emerging) and an Agent Readiness score of 9.0 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

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MCP server

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Tools for providers

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find_providersBrowse and filter every provider in the catalog.
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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