Epsilon3

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.

Epsilon3 publishes 3 APIs on the APIs.io network. Tagged areas include Company, Operations, Aerospace, Space, and Defense.

The Epsilon3 catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Epsilon3’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 25 more developer resources.

🌐 Visit website 📡 Source on GitHub
63.4/100 strong ▬ flat Agent 48/100 agent ready Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0
3 APIs 1 MCP Servers
CompanyOperationsAerospaceSpaceDefenseManufacturingProceduresWorkflowInventoryTelemetryTest ManagementProject ManagementMCP

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0
Composite quality — 63.4/100 · strong
Contract Quality 12.9 / 25
Developer Ergonomics 12.2 / 20
Commercial Clarity 18.4 / 20
Operational Transparency 10.3 / 13
Governance 1.5 / 12
Discoverability 8.2 / 10
Agent readiness — 48/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
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 7 / 7
Typed Event Surface 6 / 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
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/epsilon3: 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 3

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

Epsilon3 REST API

REST API for the Epsilon3 operations platform, organized into roughly twenty API families: Builds (work orders, parts, inventory, purchase and sale orders, vendors, tooling, shi...

Epsilon3 Realtime API

SocketIO and webhook realtime interface for integrating third-party systems with running Epsilon3 procedures. Four namespaces are published: commanding (/v1/commands/realtime), ...

Epsilon3 MCP Server

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 ...

MCP Servers 1

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

epsilon3-mcp.yml

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Epsilon3 Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Epsilon3 Rate Limits

3 limits

RATE LIMITS

Event Specifications 1

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

Epsilon3 Realtime Webhooks

ASYNCAPI

Security Posture 3

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

Epsilon3 Authentication

http/oauth2 · 4 schemes

SECURITY

Epsilon3 Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Epsilon3 Trust Center

SOC 2 Type II, FedRAMP High Authorization, NIST SP 800-171, DFARS 252.204-7012, CMMC, ITAR, EAR

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Epsilon3 Scopes

15 scopes · authorizationCode

15 scopes

SCOPES

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

WellKnown
WellKnown
 MCPServer
MCPServer
 LLMsTxt
LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Lifecycle
Lifecycle
 Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 Webhooks
Webhooks

Build 2

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk
ToolCrosswalk
 Packages
Packages

Access & Security 5

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 Compliance
Compliance
 Authentication
Authentication
 OAuthScopes
OAuthScopes
 DomainSecurity
DomainSecurity

Operate 6

Status, limits, changes, and where to get help

Support
Support
 HelpCenter
HelpCenter
 StatusPage
StatusPage
 ChangeLog
ChangeLog
 Deprecation
Deprecation
 RateLimits
RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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