Zephyr Fusion

Zephyr Fusion is a Y Combinator (Fall 2025) company building the first in-orbit fusion power source: a compact, megawatt-class magnetic-confinement fusion reactor designed to enable large-scale industry in space at a fraction of the cost of equivalent solar. Founded by former Lawrence Livermore and Oak Ridge National Laboratory physicists, the company targets microgravity manufacturing, orbital data centers, defense, propulsion, and human habitation in space, exploiting the vacuum of space to accommodate larger plasma regions than Earth-based reactors. As an early-stage deep-tech hardware company, Zephyr Fusion currently publishes no public API, developer platform, SDK, or machine-readable specification; this profile captures its identity in the API Evangelist network. An enrichment pass on 2026-07-21 confirmed no API surface exists (no api./docs./developer. hosts resolve; no /developers, /docs, or /.well-known discovery surface is published).

Zephyr Fusion is profiled on the APIs.io network. Tagged areas include Company, Fusion Energy, Nuclear Fusion, Space, and Deep Tech.

🌐 Visit website 📡 Source on GitHub

6.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyFusion EnergyNuclear FusionSpaceDeep TechClean EnergyHardwareY Combinator

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 6.8/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 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

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Resources

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Company

Company

Source (apis.yml)

aid: zephyr-fusion
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zephyr-fusion.png
name: Zephyr Fusion
description: 'Zephyr Fusion is a Y Combinator (Fall 2025) company building the first in-orbit fusion power source: a compact,
  megawatt-class magnetic-confinement fusion reactor designed to enable large-scale industry in space at a fraction of the
  cost of equivalent solar. Founded by former Lawrence Livermore and Oak Ridge National Laboratory physicists, the company
  targets microgravity manufacturing, orbital data centers, defense, propulsion, and human habitation in space, exploiting
  the vacuum of space to accommodate larger plasma regions than Earth-based reactors. As an early-stage deep-tech hardware
  company, Zephyr Fusion currently publishes no public API, developer platform, SDK, or machine-readable specification; this
  profile captures its identity in the API Evangelist network. An enrichment pass on 2026-07-21 confirmed no API surface exists
  (no api./docs./developer. hosts resolve; no /developers, /docs, or /.well-known discovery surface is published).'
url: https://raw.githubusercontent.com/api-evangelist/zephyr-fusion/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-yc-batch: Fall 2025
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Fusion Energy
- Nuclear Fusion
- Space
- Deep Tech
- Clean Energy
- Hardware
- Y Combinator
apis: []
common:
- type: Website
  url: https://www.zephyrfusion.com/
- type: Company
  url: https://www.ycombinator.com/companies/zephyr-fusion
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: nochange
  artifacts_added: 0
  pass: local-v1