Nine Fives website screenshot

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.

Nine Fives publishes 5 APIs on the APIs.io network, including Attenuator API, Firmware API, Network API, and 2 more. Tagged areas include Company, RF Test Equipment, Test and Measurement, Hardware, and IoT.

Nine Fives’ developer surface includes documentation, API reference, getting-started guide, engineering blog, support, signup flow, authentication, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
29.6/100 thin ▬ flat Agent 30/100 agent ready Front door AI 2/6 trace saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0
5 APIs
CompanyRF Test EquipmentTest and MeasurementHardwareIoTInstrumentationAutomationAerospaceAttenuatorRF SwitchSCPI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0
Composite quality — 29.6/100 · thin
Contract Quality 2.2 / 19
Developer Ergonomics 8.8 / 15
Access Clarity 3.6 / 15
Operational Transparency 0.0 / 10
Contract Governance 1.6 / 9
Discoverability 6.0 / 8
Regulatory Posture 3.1 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 30/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 6 / 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 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 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 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 5 / 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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/nine-fives: 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 5

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 API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Nine Fives Programmable REST Attenuator API

OPEN COLLECTION

Nine Fives Programmable REST Attenuator Firmware API

OPEN COLLECTION

Nine Fives Programmable REST Attenuator Network API

OPEN COLLECTION

Nine Fives Programmable REST Attenuator Switch API

OPEN COLLECTION

Nine Fives Programmable REST Attenuator System API

OPEN COLLECTION

Security Posture 2

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

Nine Fives Authentication

none · 0 schemes

SECURITY

Nine Fives Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

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 4

MCP servers, agent skills, and machine-readable catalogs

WellKnown
WellKnown
 LLMsTxt
LLMsTxt
 X-MCPServerCandidate
X-MCPServerCandidate
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conformance
Conformance
 DataModel
DataModel

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Blog
Blog
 Website
Website

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: nine-fives
name: Nine Fives
description: '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.'
url: https://raw.githubusercontent.com/api-evangelist/nine-fives/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://ninefives.com/cdn/shop/files/NineFivesLogo.svg?v=1775235707
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: profiled
x-tier-reason: has-device-api
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- RF Test Equipment
- Test and Measurement
- Hardware
- IoT
- Instrumentation
- Automation
- Aerospace
- Attenuator
- RF Switch
- SCPI
apis:
- aid: nine-fives:nine-fives-attenuator-api
  name: Nine Fives Attenuator API
  description: Attenuation setpoint control
  humanURL: https://docs.ninefives.com/attenuator/
  baseURL: http://192.168.0.95
  tags:
  - Attenuator
  properties:
  - type: OpenAPI
    url: openapi/nine-fives-attenuator-api-openapi.yml
  - type: Documentation
    url: https://docs.ninefives.com/attenuator/
  - type: APIReference
    url: https://docs.ninefives.com/attenuator/rest-api/overview/
  - type: GettingStarted
    url: https://docs.ninefives.com/attenuator/getting-started/
  - type: Documentation
    url: https://docs.ninefives.com/switch/
  - type: APIReference
    url: https://docs.ninefives.com/switch/rest-api/overview/
- aid: nine-fives:nine-fives-firmware-api
  name: Nine Fives Firmware API
  description: Firmware status and dual-slot (A/B) updates
  humanURL: https://docs.ninefives.com/attenuator/
  baseURL: http://192.168.0.95
  tags:
  - Firmware
  properties:
  - type: OpenAPI
    url: openapi/nine-fives-firmware-api-openapi.yml
  - type: Documentation
    url: https://docs.ninefives.com/attenuator/
  - type: APIReference
    url: https://docs.ninefives.com/attenuator/rest-api/overview/
  - type: GettingStarted
    url: https://docs.ninefives.com/attenuator/getting-started/
  - type: Documentation
    url: https://docs.ninefives.com/switch/
  - type: APIReference
    url: https://docs.ninefives.com/switch/rest-api/overview/
- aid: nine-fives:nine-fives-network-api
  name: Nine Fives Network API
  description: Ethernet and USB-C interface configuration
  humanURL: https://docs.ninefives.com/attenuator/
  baseURL: http://192.168.0.95
  tags:
  - Networks
  tags_raw:
  - Network
  properties:
  - type: OpenAPI
    url: openapi/nine-fives-network-api-openapi.yml
  - type: Documentation
    url: https://docs.ninefives.com/attenuator/
  - type: APIReference
    url: https://docs.ninefives.com/attenuator/rest-api/overview/
  - type: GettingStarted
    url: https://docs.ninefives.com/attenuator/getting-started/
  - type: Documentation
    url: https://docs.ninefives.com/switch/
  - type: APIReference
    url: https://docs.ninefives.com/switch/rest-api/overview/
- aid: nine-fives:nine-fives-switch-api
  name: Nine Fives Switch API
  description: SPDT switch state control
  humanURL: https://docs.ninefives.com/attenuator/
  baseURL: http://192.168.0.95
  tags:
  - Switch
  properties:
  - type: OpenAPI
    url: openapi/nine-fives-switch-api-openapi.yml
  - type: Documentation
    url: https://docs.ninefives.com/attenuator/
  - type: APIReference
    url: https://docs.ninefives.com/attenuator/rest-api/overview/
  - type: GettingStarted
    url: https://docs.ninefives.com/attenuator/getting-started/
  - type: Documentation
    url: https://docs.ninefives.com/switch/
  - type: APIReference
    url: https://docs.ninefives.com/switch/rest-api/overview/
- aid: nine-fives:nine-fives-system-api
  name: Nine Fives System API
  description: Device status and reboot
  humanURL: https://docs.ninefives.com/attenuator/
  baseURL: http://192.168.0.95
  tags:
  - System
  properties:
  - type: OpenAPI
    url: openapi/nine-fives-system-api-openapi.yml
  - type: Documentation
    url: https://docs.ninefives.com/attenuator/
  - type: APIReference
    url: https://docs.ninefives.com/attenuator/rest-api/overview/
  - type: GettingStarted
    url: https://docs.ninefives.com/attenuator/getting-started/
  - type: Documentation
    url: https://docs.ninefives.com/switch/
  - type: APIReference
    url: https://docs.ninefives.com/switch/rest-api/overview/
common:
- type: Overlay
  url: overlays/nine-fives-attenuator-overlay.yaml
- type: DomainSecurity
  url: security/nine-fives-domain-security.yml
- type: DeveloperPortal
  url: https://ninefives.com/pages/documentation
- type: Documentation
  url: https://docs.ninefives.com/
- type: APIReference
  url: https://docs.ninefives.com/attenuator/rest-api/overview/
- type: GettingStarted
  url: https://docs.ninefives.com/attenuator/getting-started/
- type: Blog
  url: https://blog.ninefives.com/
- type: Support
  url: https://ninefives.com/pages/contact
- type: SignUp
  url: https://ninefives.com/account/login
- type: PrivacyPolicy
  url: https://ninefives.com/policies/privacy-policy
- type: Website
  url: https://ninefives.com
- type: Authentication
  url: authentication/nine-fives-authentication.yml
- type: Conventions
  url: conventions/nine-fives-conventions.yml
- type: ErrorCatalog
  url: errors/nine-fives-problem-types.yml
- type: Lifecycle
  url: lifecycle/nine-fives-lifecycle.yml
- type: Conformance
  url: conformance/nine-fives-conformance.yml
- type: DataModel
  url: data-model/nine-fives-data-model.yml
- type: WellKnown
  url: well-known/nine-fives-well-known.yml
- type: LLMsTxt
  url: llms/nine-fives-llms.txt
- type: X-MCPServerCandidate
  url: mcp/nine-fives-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 20
  pass: local-v1

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/nine-fives"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/nine-fives/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/nine-fives/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.