Hop Aero

Hop Aero is a Y Combinator (Summer 2026) aerospace and defense company based in Los Angeles, California, founded in 2024 by Jacob Balaj and Matija Milenovic. The company develops hypersonic rocket cargo vehicles that deliver payloads point-to-point into austere, contested environments hundreds of miles away in minutes, aiming to give the United States and its allies an asymmetric logistics advantage. Hop Aero has raised a $3M pre-seed round and won a $1.25M U.S. Air Force SBIR award; its team draws on experience from SpaceX, Virgin Orbit, Masten Space Systems, SpinLaunch, and Destinus. This is a hardware-stage company with no public API or developer surface at the time of profiling; this record was added to the API Evangelist network as a portfolio-lead stub and is maintained for network discovery and enrichment.

Hop Aero is profiled on the APIs.io network. Tagged areas include Company, Aerospace, Defense, Space, and Logistics.

🌐 Visit website 📡 Source on GitHub

5.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Aerospace Defense Space LogisticsRocketryHypersonics Y Combinator

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 5.0/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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.

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/hop-aero: 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 →

Security Posture 1

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

Hop Aero Domain Security

TLSv1.3

SECURITY

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Website

Website

LinkedIn

Source (apis.yml)

aid: hop-aero
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
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/hop-aero.png
name: Hop Aero
description: Hop Aero is a Y Combinator (Summer 2026) aerospace and defense company based in Los Angeles, California, founded
  in 2024 by Jacob Balaj and Matija Milenovic. The company develops hypersonic rocket cargo vehicles that deliver payloads
  point-to-point into austere, contested environments hundreds of miles away in minutes, aiming to give the United States
  and its allies an asymmetric logistics advantage. Hop Aero has raised a $3M pre-seed round and won a $1.25M U.S. Air Force
  SBIR award; its team draws on experience from SpaceX, Virgin Orbit, Masten Space Systems, SpinLaunch, and Destinus. This
  is a hardware-stage company with no public API or developer surface at the time of profiling; this record was added to the
  API Evangelist network as a portfolio-lead stub and is maintained for network discovery and enrichment.
url: https://raw.githubusercontent.com/api-evangelist/hop-aero/refs/heads/main/apis.yml
x-api-posture: no-product-api
x-api-posture-basis: observed
x-api-posture-note: This is a hardware-stage company with no public API or developer surface at the time of profiling; this
  record was added to the API Evangelist network as a portfolio-lead stub and is maintained for ne
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Aerospace
- Defense
- Space
- Logistics
- Rocketry
- Hypersonics
- Y Combinator
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis: []
common:
- type: DomainSecurity
  url: security/hop-aero-domain-security.yml
- type: Website
  url: https://hop-aero.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/hop-aero/
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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