Nine Fives
Nine Fives builds modern, simple-to-use RF (radio frequency) test equipment for next-generation spacecraft, drones, and cellphones. Founded in 2025 by Andrew Kurtz and Noah Levy — RF hardware engineers who spent a decade at SpaceX designing radios and test systems for Falcon 9, Dragon, and Starship — the Y Combinator-backed company sells programmable, network-connected instruments: the POE-ATTEN-6G programmable attenuator and the POE-SWITCH-6G programmable SPDT switch, powered over USB-C or Power over Ethernet. Each instrument is automation-first: it serves a JSON REST API and a SCPI command interface (raw TCP and HiSLIP/IVI-6.1) directly on the device, plus a browser Web UI and touchscreen, with no drivers to install — control it with a plain curl command. The NineVue platform adds version-controlled test-rack configuration and an LLM skill that turns a rack drawing into functional test-automation code.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Nine Fives the way a machine reads it — 13 machine-readable artifacts across 5 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Nine Fives scores 29.0/100 (thin), with a separate agent-readiness read of 39/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/nine-fives/"
title="Nine Fives on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/nine-fives.svg"
alt="Nine Fives Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/nine-fives/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/nine-fives/"
title="Nine Fives on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/nine-fives/card.svg"
alt="Nine Fives Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Nine Fives
Each block below is one kind of artifact we hold for Nine Fives. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 5
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Nine Fives Attenuator API
Attenuation setpoint control
Nine Fives Firmware API
Firmware status and dual-slot (A/B) updates
Nine Fives Network API
Ethernet and USB-C interface configuration
Nine Fives Switch API
SPDT switch state control
Nine Fives System API
Device status and reboot
Open Collections 6
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONNine Fives Programmable REST Attenuator API
OPEN COLLECTIONNine Fives Programmable REST Attenuator Firmware API
OPEN COLLECTIONNine Fives Programmable REST Attenuator Network API
OPEN COLLECTIONNine Fives Programmable REST Attenuator Switch API
OPEN COLLECTIONNine Fives Programmable REST Attenuator System API
OPEN COLLECTIONSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Nine Fives — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/nine-fives · machine-readable index on apis.io
This is an independent, third-party profile of Nine Fives, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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