# Castelion

**Canonical:** https://apis.io/providers/castelion/  
**Website:** https://www.castelion.com/  
**APIs profiled:** 0

Castelion is a vertically integrated defense technology company that designs, tests, and manufactures next-generation military systems, with a focus on affordable, mass-producible hypersonic strike weapons such as its Blackbeard system, built rapidly and at scale to deter future conflict. Founded by former SpaceX and defense-industry engineers, it operates manufacturing and test facilities in Torrance, CA; Rio Rancho, NM; Midland, TX; and Allen, TX. Castelion is privately held and backed by Andreessen Horowitz (a16z), General Catalyst, and Lightspeed Venture Partners. It publishes no public API, developer portal, or technical documentation; this API Evangelist profile tracks it as a company in the network.

## Kin Score — 9.7 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 9.7).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 2.4 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Castelion Domain Security** — TLSv1.3 · DMARC

## Tags

Company, Defense, Aerospace, Hypersonics, Manufacturing, Weapons Systems, National Security

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/castelion/). Scores are computed from the provider's own public artifacts under a published rubric.