Halcyon

Halcyon (Halcyon Tech, Inc.) is a cybersecurity company that builds a purpose-built, adaptive anti-ransomware and cyber-resilience platform. Its lightweight endpoint agent combines automated detection and disruption across the full ransomware attack lifecycle — pre-execution, encryption, and data exfiltration — with encryption-key recovery, a managed 24/7 Ransomware Operations Center (ROC), and a ransomware recovery warranty. Halcyon exposes a REST API for device/asset data and a universal API that streams alerts into SIEM, SOAR, and XDR platforms such as Splunk, Microsoft Sentinel, Google SecOps, Sumo Logic, and Exabeam, alongside backup integrations with Veeam, Cohesity, Acronis, and Commvault. Backed by Bain Capital Ventures and Obvious Ventures.

Halcyon publishes 1 API on the APIs.io network. Tagged areas include Company, Ai Infrastructure, Cybersecurity, Ransomware, and Endpoint Security.

Halcyon’s developer surface includes documentation, engineering blog, support, signup flow, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
23.0/100 emerging Agent 0/100 human only Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 0 Features
CompanyAi InfrastructureCybersecurityRansomwareEndpoint SecurityThreat DetectionSIEMAPI

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 23.0/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 3.0 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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
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/halcyon: 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

Halcyon API

Halcyon's REST API for device/asset data plus a universal API for streaming ransomware alerts into SIEM, SOAR, and XDR platforms. The API and its documentation are customer-auth...

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp
SignUp

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 Compliance
Compliance
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy
 TermsOfService
TermsOfService

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: halcyon
name: Halcyon
description: Halcyon (Halcyon Tech, Inc.) is a cybersecurity company that builds a purpose-built, adaptive anti-ransomware
  and cyber-resilience platform. Its lightweight endpoint agent combines automated detection and disruption across the full
  ransomware attack lifecycle — pre-execution, encryption, and data exfiltration — with encryption-key recovery, a managed
  24/7 Ransomware Operations Center (ROC), and a ransomware recovery warranty. Halcyon exposes a REST API for device/asset
  data and a universal API that streams alerts into SIEM, SOAR, and XDR platforms such as Splunk, Microsoft Sentinel, Google
  SecOps, Sumo Logic, and Exabeam, alongside backup integrations with Veeam, Cohesity, Acronis, and Commvault. Backed by Bain
  Capital Ventures and Obvious Ventures.
url: https://raw.githubusercontent.com/api-evangelist/halcyon/refs/heads/main/apis.yml
image: https://cdn.prod.website-files.com/6568a1bce0ae49e6bedec385/68d553829246f2a4e5ced212_Halcyon_OpenGraph_Homepage.jpg
x-type: company
x-source: vc-portfolio
x-backed-by:
- bain-capital-ventures
- obvious-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Ai Infrastructure
- Cybersecurity
- Ransomware
- Endpoint Security
- Threat Detection
- SIEM
- API
apis:
- name: Halcyon API
  description: Halcyon's REST API for device/asset data plus a universal API for streaming ransomware alerts into SIEM, SOAR,
    and XDR platforms. The API and its documentation are customer-authenticated (access-gated); no public OpenAPI is published.
  humanURL: https://www.halcyon.ai/platform/deployments-integrations
  baseURL: https://api.halcyon.ai
  properties:
  - type: Documentation
    url: https://docs.halcyon.ai/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.halcyon.ai/
- type: Documentation
  url: https://docs.halcyon.ai/
- type: Blog
  url: https://www.halcyon.ai/blog
- type: Support
  url: https://supportal.halcyon.ai/
- type: SignUp
  url: https://www.halcyon.ai/get-a-demo
- type: PrivacyPolicy
  url: https://www.halcyon.ai/policies/privacy-policy
- type: TermsOfService
  url: https://www.halcyon.ai/policies/terms-of-service
- type: GitHubOrganization
  url: https://github.com/halcyon-ai
- type: TrustCenter
  url: security/halcyon-trust-center.yml
- type: Compliance
  url: https://trust.halcyon.ai/
- type: DomainSecurity
  url: security/halcyon-domain-security.yml
- type: LLMsTxt
  url: llms/halcyon-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence