Argmax

Argmax, Inc. builds on-device inference infrastructure that lets developers run foundation models locally on user devices for privacy, real-time performance, and predictable per-device costs. Its products are commercial Pro SDKs on top of open-source cores: WhisperKit (speech-to-text with file transcription, real-time streaming, word timestamps, and subtitle export), SpeakerKit (speaker recognition, diarization, and voice-activity detection), DiffusionKit (image generation for Flux.1 and Stable Diffusion on Apple Silicon), and TTSKit. Argmax also ships the Argmax Local Server for macOS, a local transcription server that is API-compatible with the Deepgram Speech-to-Text (Live) API and driven by an official Node client (@argmaxinc/local-server). Devices are licensed through the ArgmaxSDK (ax_-prefixed API keys) with device-based billing measured by unique licenseId. Backed by General Catalyst.

Argmax is listed with 1 API on the APIs.io network. Tagged areas include Company, Enterprise, Artificial Intelligence, Machine Learning, and On-Device Inference.

Argmax’s developer surface includes documentation, API reference, getting-started guide, pricing, engineering blog, changelog, sandbox, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

42.0/100 developing ▬ flat Agent 3/100 human only Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 API

Company Enterprise Artificial Intelligence Machine LearningOn-Device InferenceSpeech Recognition Speech-to-Text Transcription Speaker Diarization Image Generation SDK Apple Silicon Edge AI

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 42.0/100 · developing

Contract Quality 0.0 / 21

Developer Ergonomics 12.1 / 17

Access Clarity 14.3 / 17

Operational Transparency 3.8 / 11

Contract Governance 0.0 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.7 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Contract Governance scores 0.0 — up to +12.0 composite points
Operational Transparency scores 34.2 — up to +8.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/argmax/apis.yml: open an issue on github.com/api-evangelist/argmax to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Speech and Voice AI	covered	26.8 (thin)	-	-
Apple Accessory & Device Ecosystem (MFi, Matter, Apple partners)	covered	26.8 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Argmax Local Server

A local transcription server for macOS that is API-compatible with the Deepgram Speech-to-Text (Live) API, exposing a WebSocket streaming interface (default ws://localhost:50060...

Argmax API pricing

Prices published by Argmax, read 2026-10-07 from www.argmaxinc.com/pricing. A free plan or tier is listed.

Plan	Price
Basic Plan	Free Includes: Open-source (MIT License), Public Discord support, WhisperKit, SpeakerKit, TTSKit
Pro Plan (monthly)	$1.33/device/month Includes: 1,000 monthly licenses minimum; everything in Basic Plan, WhisperKit Pro, SpeakerKit Pro, Private Sl
Pro Plan (yearly)	$1.00/device/month Includes: 10,000 monthly licenses minimum
Enterprise Plan	Custom Includes: Everything in Pro Plan, implementation support, custom model support, priority Slack support, custom

Plan details, limits and sources →

Billed by: device · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Argmax Plans Pricing

4 plans

PLANS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Argmax Finops

FINOPS

Security Posture 2

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

Argmax Authentication

apiKey · 1 scheme

SECURITY

Argmax Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

Sandbox

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Models

Models

Source (apis.yml)

aid: argmax
name: Argmax
description: 'Argmax, Inc. builds on-device inference infrastructure that lets developers run foundation models locally on
  user devices for privacy, real-time performance, and predictable per-device costs. Its products are commercial Pro SDKs
  on top of open-source cores: WhisperKit (speech-to-text with file transcription, real-time streaming, word timestamps, and
  subtitle export), SpeakerKit (speaker recognition, diarization, and voice-activity detection), DiffusionKit (image generation
  for Flux.1 and Stable Diffusion on Apple Silicon), and TTSKit. Argmax also ships the Argmax Local Server for macOS, a local
  transcription server that is API-compatible with the Deepgram Speech-to-Text (Live) API and driven by an official Node client
  (@argmaxinc/local-server). Devices are licensed through the ArgmaxSDK (ax_-prefixed API keys) with device-based billing
  measured by unique licenseId. Backed by General Catalyst.'
url: https://raw.githubusercontent.com/api-evangelist/argmax/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:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  try_now_blocked_by: loopback
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://cdn.prod.website-files.com/677fd5c33a098b58d447e17b/678ec5cb674cb149d3c4c026_Argmax-OpenGraph.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- general-catalyst
x-tier: profiled
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Enterprise
- Artificial Intelligence
- Machine Learning
- On-Device Inference
- Speech Recognition
- Speech-to-Text
- Transcription
- Speaker Diarization
- Image Generation
- SDK
- Apple Silicon
- Edge AI
tags_raw:
- Company
- Enterprise
- Artificial Intelligence
- Machine Learning
- On-Device Inference
- Speech Recognition
- Speech to Text
- Transcription
- Speaker Diarization
- Image Generation
- SDKs
- Apple Silicon
- Edge AI
- Machine-Learning
- Image-Generation
apis:
- name: Argmax Local Server
  description: A local transcription server for macOS that is API-compatible with the Deepgram Speech-to-Text (Live) API,
    exposing a WebSocket streaming interface (default ws://localhost:50060) driven by the official @argmaxinc/local-server
    Node client. Authenticated with an Argmax API key (ax_ prefix); a Python client is documented as coming soon.
  humanURL: https://app.argmaxinc.com/docs/guides/using-local-server
  baseURL: ws://localhost:50060
  tags:
  - Speech-to-Text
  - Transcription
  - Streaming
  - WebSocket
  - Deepgram-Compatible
  tags_raw:
  - Speech to Text
  - Transcription
  - Streaming
  - WebSocket
  - Deepgram-Compatible
  properties:
  - type: Documentation
    url: https://app.argmaxinc.com/docs/guides/using-local-server
  - type: SDKs
    url: https://www.npmjs.com/package/@argmaxinc/local-server
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/argmax-plans-pricing.yml
- type: DomainSecurity
  url: security/argmax-domain-security.yml
- type: Website
  url: https://www.argmaxinc.com
- type: DeveloperPortal
  url: https://app.argmaxinc.com
- type: Documentation
  url: https://app.argmaxinc.com/docs
- type: APIReference
  url: https://app.argmaxinc.com/docs/guides/using-local-server
- type: GettingStarted
  url: https://app.argmaxinc.com/docs/guides/upgrading-to-pro-sdk
- type: Models
  url: https://app.argmaxinc.com/docs/models
- type: Pricing
  url: https://www.argmaxinc.com/pricing
- type: Blog
  url: https://www.argmaxinc.com/blog
- type: GitHubOrganization
  url: https://github.com/argmaxinc
- type: StatusPage
  url: https://status.argmaxinc.com
- type: ChangeLog
  url: https://app.argmaxinc.com/docs/changelog
- type: Sandbox
  url: https://testflight.apple.com/join/Q1cywTJw
- type: Support
  url: mailto:pro-sdk-support@argmaxinc.com
- type: SignUp
  url: https://app.argmaxinc.com
- type: Login
  url: https://app.argmaxinc.com/login
- type: TermsOfService
  url: https://www.argmaxinc.com/terms-of-service
- type: PrivacyPolicy
  url: https://www.argmaxinc.com/privacy
- type: Packages
  url: packages/argmax-packages.yml
- type: SDKs
  url: packages/argmax-packages.yml
- type: Authentication
  url: authentication/argmax-authentication.yml
- type: Conventions
  url: conventions/argmax-conventions.yml
- type: LLMsTxt
  url: llms/argmax-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Argmax API — frequently asked questions

Does Argmax have an API?

Yes. APIs.io lists 1 API from Argmax, including Argmax Local Server.

How do I authenticate with the Argmax API?

Argmax uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Argmax Authentication.

How much does the Argmax API cost?

Argmax publishes its prices; its Pro Plan (monthly) plan is $1.33/device/month as of 2026-10-07. APIs.io lists 4 pricing plans for Argmax, with each plan's price, limits and inclusions under Pricing on this page.

Is the Argmax API ready for AI agents?

Argmax has a Kin Score of 42.0 out of 100 (developing) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-06.

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