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 13 more developer resources.

🌐 Visit website 📡 Source on GitHub
40.6/100 thin ▬ flat Agent 55/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5
5 APIs 1 MCP Servers
CompanyRF Test EquipmentTest and MeasurementHardwareIoTInstrumentationAutomationAerospaceAttenuatorRF SwitchSCPI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 40.6/100 · thin
Contract Quality 12.4 / 25
Developer Ergonomics 13.5 / 20
Commercial Clarity 4.7 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 55/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
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 4 / 4
Consent & Bot Identity 0 / 3
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

MCP Servers 1

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

nine-fives-mcp.yml

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

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: '0.20'
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: 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