Matter

Matter is a modern read-later application for people who take reading seriously — save articles, newsletters, podcasts, PDFs, and tweets from anywhere and read them in a clean, focused interface on iOS and the web, with highlighting, notes, tags, offline search, text-to-speech, and audio transcription of podcasts and videos. For Matter Pro subscribers, Matter ships a public REST API (api.getmatter.com/public/v1) to save, organize, search, and incrementally sync a reading library, secured with a personal Bearer token. It is complemented by a first-party CLI/TUI and official Obsidian, Roam, and Logseq highlight-export integrations. Matter is backed by GV (Google Ventures).

Matter publishes 6 APIs on the APIs.io network, including Account API, Annotations API, Items API, and 3 more. Tagged areas include Company, Consumer, Reading, Read Later, and Productivity.

Matter’s developer surface includes documentation, API reference, getting-started guide, authentication, CLI, support, signup flow, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub

54.3/100 developing ▬ flat Agent 79/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessSelf serve

6 APIs 1 MCP Servers

CompanyConsumerReadingRead LaterProductivityContentHighlightsBookmarking

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 54.3/100 · developing

Contract Quality 15.9 / 25

Developer Ergonomics 14.3 / 20

Commercial Clarity 6.8 / 20

Operational Transparency 7.2 / 13

Governance 0.0 / 12

Discoverability 10.0 / 10

Agent readiness — 79/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 15 / 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 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 3 / 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/matter: 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 6

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

MCP Servers 1

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

matter-mcp.yml

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer

AgentSkill

AgenticAccess

LLMsTxt

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

DataModel

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

Packages

Packages

CLI

CLI

GitHubOrganization

GitHubOrganization

Access & Security 5

Authentication, authorization, and security posture

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Deprecation

Deprecation

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: matter
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/matter.png
name: Matter
description: Matter is a modern read-later application for people who take reading seriously — save articles, newsletters,
  podcasts, PDFs, and tweets from anywhere and read them in a clean, focused interface on iOS and the web, with highlighting,
  notes, tags, offline search, text-to-speech, and audio transcription of podcasts and videos. For Matter Pro subscribers,
  Matter ships a public REST API (api.getmatter.com/public/v1) to save, organize, search, and incrementally sync a reading
  library, secured with a personal Bearer token. It is complemented by a first-party CLI/TUI and official Obsidian, Roam,
  and Logseq highlight-export integrations. Matter is backed by GV (Google Ventures).
url: https://raw.githubusercontent.com/api-evangelist/matter/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- gv
x-tier: profiled
x-tier-reason: enriched-2026-07-20
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 22
  pass: local-v1
tags:
- Company
- Consumer
- Reading
- Read Later
- Productivity
- Content
- Highlights
- Bookmarking
apis:
- aid: matter:matter-account-api
  name: Matter Account API
  description: Your user profile and API quota.
  humanURL: https://docs.getmatter.com/api
  baseURL: https://api.getmatter.com/public/v1
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/matter-account-api-openapi.yml
  - type: Documentation
    url: https://docs.getmatter.com/api
  - type: APIReference
    url: https://docs.getmatter.com/api
  - type: Authentication
    url: https://docs.getmatter.com/api/authentication
- aid: matter:matter-annotations-api
  name: Matter Annotations API
  description: Highlights and notes on items.
  humanURL: https://docs.getmatter.com/api
  baseURL: https://api.getmatter.com/public/v1
  tags:
  - Annotations
  properties:
  - type: OpenAPI
    url: openapi/matter-annotations-api-openapi.yml
  - type: Documentation
    url: https://docs.getmatter.com/api
  - type: APIReference
    url: https://docs.getmatter.com/api
  - type: Authentication
    url: https://docs.getmatter.com/api/authentication
- aid: matter:matter-items-api
  name: Matter Items API
  description: Articles, podcasts, videos, PDFs, and tweets in your library.
  humanURL: https://docs.getmatter.com/api
  baseURL: https://api.getmatter.com/public/v1
  tags:
  - Items
  properties:
  - type: OpenAPI
    url: openapi/matter-items-api-openapi.yml
  - type: Documentation
    url: https://docs.getmatter.com/api
  - type: APIReference
    url: https://docs.getmatter.com/api
  - type: Authentication
    url: https://docs.getmatter.com/api/authentication
- aid: matter:matter-reading-sessions-api
  name: Matter Reading Sessions API
  description: Reading time history.
  humanURL: https://docs.getmatter.com/api
  baseURL: https://api.getmatter.com/public/v1
  tags:
  - Reading Sessions
  properties:
  - type: OpenAPI
    url: openapi/matter-reading-sessions-api-openapi.yml
  - type: Documentation
    url: https://docs.getmatter.com/api
  - type: APIReference
    url: https://docs.getmatter.com/api
  - type: Authentication
    url: https://docs.getmatter.com/api/authentication
- aid: matter:matter-search-api
  name: Matter Search API
  description: Full-text search across Matter.
  humanURL: https://docs.getmatter.com/api
  baseURL: https://api.getmatter.com/public/v1
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/matter-search-api-openapi.yml
  - type: Documentation
    url: https://docs.getmatter.com/api
  - type: APIReference
    url: https://docs.getmatter.com/api
  - type: Authentication
    url: https://docs.getmatter.com/api/authentication
- aid: matter:matter-tags-api
  name: Matter Tags API
  description: Labels for organizing items.
  humanURL: https://docs.getmatter.com/api
  baseURL: https://api.getmatter.com/public/v1
  tags:
  - Tags
  properties:
  - type: OpenAPI
    url: openapi/matter-tags-api-openapi.yml
  - type: Documentation
    url: https://docs.getmatter.com/api
  - type: APIReference
    url: https://docs.getmatter.com/api
  - type: Authentication
    url: https://docs.getmatter.com/api/authentication
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DeveloperPortal
  url: https://docs.getmatter.com
- type: Documentation
  url: https://docs.getmatter.com/api
- type: APIReference
  url: https://docs.getmatter.com/api
- type: GettingStarted
  url: https://docs.getmatter.com/api/quickstart
- type: Authentication
  url: authentication/matter-authentication.yml
- type: Conventions
  url: conventions/matter-conventions.yml
- type: ErrorCatalog
  url: errors/matter-problem-types.yml
- type: RateLimits
  url: rate-limits/matter-rate-limits.yml
- type: Lifecycle
  url: lifecycle/matter-lifecycle.yml
- type: Deprecation
  url: lifecycle/matter-lifecycle.yml
- type: DataModel
  url: data-model/matter-data-model.yml
- type: Conformance
  url: conformance/matter-conformance.yml
- type: Packages
  url: packages/matter-packages.yml
- type: CLI
  url: cli/matter-cli.yml
- type: MCPServer
  url: mcp/matter-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: AgenticAccess
  url: agentic-access/matter-agentic-access.yml
- type: LLMsTxt
  url: llms/matter-llms.txt
- type: WellKnown
  url: well-known/matter-well-known.yml
- type: SecurityTxt
  url: well-known/matter-security.txt
- type: VulnerabilityDisclosure
  url: security/matter-vulnerability-disclosure.yml
- type: Security
  url: security/matter-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/matter-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/getmatterapp
- type: Support
  url: mailto:hello@getmatter.com
- type: SignUp
  url: https://web.getmatter.com
- type: Login
  url: https://web.getmatter.com
- type: TermsOfService
  url: https://www.getmatter.com/terms
- type: PrivacyPolicy
  url: https://www.getmatter.com/privacy
- type: Website
  url: https://www.getmatter.com

Matter

Kin Score

APIs 6

Matter Account API

Matter Annotations API

Matter Items API

Matter Reading Sessions API

Matter Search API

Matter Tags API

MCP Servers 1

matter-mcp.yml

Rate Limits 1

Matter Rate Limits

Security Posture 3

Matter Authentication

Matter Domain Security

Matter Vulnerability Disclosure

Agentic Access 1

Matter Agentic Access

Resources