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
41.2/100 developing ▬ flat Agent 41/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
5 APIs 1 MCP Servers
CompanyRF Test EquipmentTest and MeasurementHardwareIoTInstrumentationAutomationAerospaceAttenuatorRF SwitchSCPI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 41.2/100 · developing
Contract Quality 11.8 / 25
Developer Ergonomics 11.8 / 20
Access Clarity 4.7 / 20
Operational Transparency 0.0 / 13
Contract Governance 3.6 / 12
Discoverability 9.3 / 10
Agent readiness — 41/100 · 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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

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

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Nine Fives MCP Server

MCP SERVER

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
 MCPServer
MCPServer
 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
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:
  - 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: MCPServer
  url: mcp/nine-fives-mcp.yml
- 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