Capsule8

Capsule8 was a New York-based cybersecurity company (founded 2016) that built high-performance runtime visibility, detection, and response for Linux production servers and containers across on-premises and cloud workloads. Its open-source sensor exposed a gRPC (v0) telemetry API for subscribing to security events. Sophos acquired Capsule8 in July 2021 and absorbed the technology into its Adaptive Cybersecurity Ecosystem (Intercept X server protection, XDR, and Managed Threat Response). The capsule8.com domain now redirects to Sophos, the flagship open-source sensor/API repository has been removed, and no independent Capsule8 developer API, portal, or documentation remains live. This profile was surfaced as a Bessemer Venture Partners portfolio company and is retained as an acquired-company record.

Capsule8 is profiled on the APIs.io network. Tagged areas include Company, Cybersecurity, Linux Security, Runtime Security, and Container Security.

🌐 Visit website 📡 Source on GitHub

5.3/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company CybersecurityLinux SecurityRuntime Security Container SecurityCloud Workload ProtectionAcquired

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 5.3/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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.

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Resources

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: capsule8
name: Capsule8
description: Capsule8 was a New York-based cybersecurity company (founded 2016) that built high-performance runtime visibility,
  detection, and response for Linux production servers and containers across on-premises and cloud workloads. Its open-source
  sensor exposed a gRPC (v0) telemetry API for subscribing to security events. Sophos acquired Capsule8 in July 2021 and absorbed
  the technology into its Adaptive Cybersecurity Ecosystem (Intercept X server protection, XDR, and Managed Threat Response).
  The capsule8.com domain now redirects to Sophos, the flagship open-source sensor/API repository has been removed, and no
  independent Capsule8 developer API, portal, or documentation remains live. This profile was surfaced as a Bessemer Venture
  Partners portfolio company and is retained as an acquired-company record.
url: https://raw.githubusercontent.com/api-evangelist/capsule8/refs/heads/main/apis.yml
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - url: https://capsule8.com/
    status: 301
    note: declared website redirects to https://www.sophos.com/en-us/public-cloud — a different registrable domain (capsule8.com
      -> sophos.com), possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/u/22600059?v=4
x-type: company
x-source: vc-portfolio
x-backed-by:
- bessemer-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
x-status: acquired
x-acquired-by: sophos
x-acquired-date: '2021-07-07'
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Cybersecurity
- Linux Security
- Runtime Security
- Container Security
- Cloud Workload Protection
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://capsule8.com/
- type: GitHubOrganization
  url: https://github.com/capsule8
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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