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, Aerospace, Space, Defense, and Manufacturing.

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

60.2/100 strong ▬ flat Agent 50/100 agent ready Front door AI 5/6 prominent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessPaidSelf serve

3 APIs 1 MCP Servers

Company Aerospace Space Defense Manufacturing Procedures Workflows Inventory Telemetry Test Management Project Management MCP

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 60.2/100 · strong

Contract Quality 8.3 / 21

Developer Ergonomics 9.1 / 17

Access Clarity 13.4 / 17

Operational Transparency 8.7 / 11

Contract Governance 1.9 / 10

Discoverability 6.8 / 9

Regulatory Posture 5.9 / 15

Agent readiness — 50/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

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/.

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 github.com/api-evangelist/epsilon3: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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 Server

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

Conventions

ErrorCatalog

Conformance

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

Compliance

Authentication

OAuthScopes

DomainSecurity

Operate 6

Status, limits, changes, and where to get help

Support

HelpCenter

StatusPage

ChangeLog

Deprecation

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

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.
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: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-09-02'
  method: derived
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: '0.23'
created: '2026-08-12'
modified: '2026-08-12'
tags:
- Company
- Aerospace
- Space
- Defense
- Manufacturing
- Procedures
- Workflows
- Inventory
- Telemetry
- Test Management
- Project Management
- MCP
tags_raw:
- 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:
  - Procedures
  - Inventory
  - Work Orders
  - Test Management
  tags_raw:
  - 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:
  - Real-Time
  - Webhook
  - Telemetry
  - Commanding
  tags_raw:
  - 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

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