aid: epsilon3
name: Epsilon3
description: 'Epsilon3 is a US-based operations software provider whose platform turns
  static procedures into live, executable, auditable workflows for high-reliability
  teams in space, defense, aerospace manufacturing, and energy. The product spans procedure
  authoring and execution (runs), work orders, parts and inventory, purchase and sale
  orders, tooling and maintenance, shipments, project schedules, issues, test and requirements
  management, skills, and telemetry/commanding. Its developer surface is a per-workspace
  API-key REST API at api.epsilon3.io/v1 documented across roughly twenty API families
  and 200-plus endpoints, a SocketIO and webhook realtime interface for commanding,
  external data, notifications and telemetry streaming, and a hosted read-only Model
  Context Protocol server at mcp.epsilon3.io fronted by OAuth 2.1 with dynamic client
  registration and fifteen published scopes. Customers include NASA, Blue Origin, Redwire,
  Axiom Space and AeroVironment; deployment options span multi-tenant cloud, UK and EU
  regions, on-premises, and FedRAMP High on AWS GovCloud.'
image: https://static1.squarespace.com/static/602ec1c9965913605a250907/t/666747f4afb0bc6004370ebf/1785952863858/Epsilon3+Logo+2130x1200.jpg?format=1500w
url: https://raw.githubusercontent.com/api-evangelist/epsilon3/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-12'
modified: '2026-08-12'
tags:
- Company
- Operations
- Aerospace
- Space
- Defense
- Manufacturing
- Procedures
- Workflow
- Inventory
- Telemetry
- Test Management
- Project Management
- MCP
apis:
- name: Epsilon3 REST API
  description: 'REST API for the Epsilon3 operations platform, organized into roughly
    twenty API families: Builds (work orders, parts, inventory, purchase and sale orders,
    vendors, tooling, shipments), Chat, Commanding, Custom Fields, Dictionaries, Events,
    External Data, Files, Issues, Procedures, Project Schedule, Roles, Runs (v1 and
    v2), Search, Settings, Skills, Snippets, Swimlanes, Telemetry, Test Management,
    and Users. Resource-oriented URLs, JSON request and response bodies, standard HTTP
    verbs and status codes, authenticated with a per-workspace API key supplied as the
    username component of HTTP Basic auth.'
  humanURL: https://docs.epsilon3.io/
  baseURL: https://api.epsilon3.io/v1
  tags:
  - Operations
  - Procedures
  - Inventory
  - Work Orders
  - Test Management
  properties:
  - type: Documentation
    url: https://docs.epsilon3.io/
  - type: APIReference
    url: https://docs.epsilon3.io/#introduction
  - type: GettingStarted
    url: https://support.epsilon3.io/en/articles/8779712-generate-api-key
  - type: Authentication
    url: authentication/epsilon3-authentication.yml
  - type: RateLimits
    url: rate-limits/epsilon3-rate-limits.yml
  - type: Conventions
    url: conventions/epsilon3-conventions.yml
  - type: ErrorCatalog
    url: errors/epsilon3-problem-types.yml
- name: Epsilon3 Realtime API
  description: 'SocketIO and webhook realtime interface for integrating third-party
    systems with running Epsilon3 procedures. Four namespaces are published: commanding
    (/v1/commands/realtime), external data (/v1/external-data/items), notifications
    (/v1/notifications/realtime) and telemetry (/v1/telemetry/realtime). Webhook deliveries
    are signed with an Epsilon3-Signature header verified against a per-workspace webhook
    key. Realtime authentication requires a team-scoped API key.'
  humanURL: https://docs.epsilon3.io/#realtime-introduction
  baseURL: https://api.epsilon3.io
  tags:
  - Realtime
  - Webhooks
  - Telemetry
  - Commanding
  properties:
  - type: Webhooks
    url: asyncapi/epsilon3-realtime-webhooks.yml
  - type: Documentation
    url: https://docs.epsilon3.io/#realtime-introduction
- name: Epsilon3 MCP Server
  description: 'Hosted, remote Model Context Protocol server exposing Epsilon3 procedures,
    runs, parts and inventory, and issues to MCP-capable assistants. Read-only in the
    current preview: it can search, open, query and trace records but cannot create,
    edit or delete. Authorization is OAuth 2.1 authorization-code with PKCE S256 and
    dynamic client registration, with fifteen scopes advertised via RFC 8414 and RFC
    9728 metadata; an Epsilon3 API key may also be presented as a bearer token. Regional
    endpoints are published for the UK and EU.'
  humanURL: https://www.epsilon3.io/behind-the-console/introducing-epsilon3-mcp-preview
  baseURL: https://mcp.epsilon3.io
  tags:
  - MCP
  - Agents
  - Search
  properties:
  - type: MCPServer
    url: mcp/epsilon3-mcp.yml
  - type: ToolCrosswalk
    url: mcp/epsilon3-tool-crosswalk.yml
  - type: OAuthScopes
    url: scopes/epsilon3-scopes.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.epsilon3.io/
- type: DeveloperPortal
  url: https://docs.epsilon3.io/
- type: Documentation
  url: https://docs.epsilon3.io/
- type: APIReference
  url: https://docs.epsilon3.io/#introduction
- type: GettingStarted
  url: https://support.epsilon3.io/en/articles/8779712-generate-api-key
- type: Support
  url: https://www.epsilon3.io/support
- type: HelpCenter
  url: https://support.epsilon3.io/
- type: Blog
  url: https://www.epsilon3.io/behind-the-console
- type: Pricing
  url: https://www.epsilon3.io/pricing
- type: SignUp
  url: https://app.epsilon3.io/
- type: TermsOfService
  url: https://www.epsilon3.io/terms
- type: PrivacyPolicy
  url: https://www.epsilon3.io/privacy
- type: StatusPage
  url: https://status.epsilon3.io/
- type: TrustCenter
  url: security/epsilon3-trust-center.yml
- type: Compliance
  url: https://www.epsilon3.io/security
- type: ChangeLog
  url: changelog/epsilon3-changelog.yml
- type: Lifecycle
  url: lifecycle/epsilon3-lifecycle.yml
- type: Deprecation
  url: lifecycle/epsilon3-lifecycle.yml
- type: Authentication
  url: authentication/epsilon3-authentication.yml
- type: OAuthScopes
  url: scopes/epsilon3-scopes.yml
- type: Conventions
  url: conventions/epsilon3-conventions.yml
- type: RateLimits
  url: rate-limits/epsilon3-rate-limits.yml
- type: Plans
  url: plans/epsilon3-plans-pricing.yml
- type: ErrorCatalog
  url: errors/epsilon3-problem-types.yml
- type: Conformance
  url: conformance/epsilon3-conformance.yml
- type: WellKnown
  url: well-known/epsilon3-well-known.yml
- type: MCPServer
  url: mcp/epsilon3-mcp.yml
- type: ToolCrosswalk
  url: mcp/epsilon3-tool-crosswalk.yml
- type: Webhooks
  url: asyncapi/epsilon3-realtime-webhooks.yml
- type: LLMsTxt
  url: llms/epsilon3-llms.txt
- type: Packages
  url: packages/epsilon3-packages.yml
- type: DomainSecurity
  url: security/epsilon3-domain-security.yml
x-enrichment:
  date: '2026-08-12'
  status: enriched
  artifacts_added: 20
  pass: local-v1