Mattermark

Mattermark is a business-intelligence platform for data-driven deal making, providing profiles on roughly four million companies and twenty million key contacts along with their investors, funding events, and news. Relaunched as an independent company, Mattermark exposes its dataset through a REST API (api.mattermark.com) and a GraphQL API (eapi.mattermark.com), both authenticated with a Bearer API key and queryable with the Mattermark Search Filter Language (MSFL). Originally an a16z / Slow Ventures / Version One Ventures-backed startup, it is tracked in the API Evangelist network as a company profile.

Mattermark publishes 2 APIs on the APIs.io network. Tagged areas include Company, Business Intelligence, Company Data, Investors, and Funding.

Mattermark’s developer surface includes documentation, API reference, getting-started guide, pricing, engineering blog, authentication, changelog, and 15 more developer resources.

🌐 Visit website 📡 Source on GitHub

29.6/100 emerging ▬ flat Agent 36/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessSelf serve

2 APIs 1 MCP Servers

CompanyBusiness IntelligenceCompany DataInvestorsFundingSales IntelligenceMarket Research

Kin Score

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

Composite quality — 29.6/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 11.3 / 20

Commercial Clarity 6.3 / 20

Operational Transparency 2.7 / 13

Governance 0.0 / 12

Discoverability 9.3 / 10

Agent readiness — 36/100 · agent aware

Machine-Readable Contract 0 / 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 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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/mattermark: 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 2

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

Mattermark REST API

RESTful access to Mattermark company, investor, funding-event, news and personnel data, with page-based pagination and MSFL query endpoints.

Mattermark GraphQL API

GraphQL access to the Mattermark dataset using the Mattermark Search Filter Language (MSFL) for complex company and investor queries.

MCP Servers 1

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

mattermark-mcp.yml

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

ChangeLog

ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: mattermark
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/mattermark.png
name: Mattermark
description: Mattermark is a business-intelligence platform for data-driven deal making, providing profiles on roughly four
  million companies and twenty million key contacts along with their investors, funding events, and news. Relaunched as an
  independent company, Mattermark exposes its dataset through a REST API (api.mattermark.com) and a GraphQL API (eapi.mattermark.com),
  both authenticated with a Bearer API key and queryable with the Mattermark Search Filter Language (MSFL). Originally an
  a16z / Slow Ventures / Version One Ventures-backed startup, it is tracked in the API Evangelist network as a company profile.
url: https://raw.githubusercontent.com/api-evangelist/mattermark/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- slow-ventures
- version-one-ventures
x-tier: profiled
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Business Intelligence
- Company Data
- Investors
- Funding
- Sales Intelligence
- Market Research
apis:
- name: Mattermark REST API
  description: RESTful access to Mattermark company, investor, funding-event, news and personnel data, with page-based pagination
    and MSFL query endpoints.
  humanURL: https://developer.mattermark.com/reference
  baseURL: https://api.mattermark.com/
  properties:
  - type: Documentation
    url: https://developer.mattermark.com/docs
  - type: APIReference
    url: https://developer.mattermark.com/reference
  - type: Authentication
    url: authentication/mattermark-authentication.yml
- name: Mattermark GraphQL API
  description: GraphQL access to the Mattermark dataset using the Mattermark Search Filter Language (MSFL) for complex company
    and investor queries.
  humanURL: https://developer.mattermark.com/graphql
  baseURL: https://eapi.mattermark.com/
  properties:
  - type: Documentation
    url: https://developer.mattermark.com/graphql
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://mattermark.com
- type: DeveloperPortal
  url: https://developer.mattermark.com/
- type: Documentation
  url: https://developer.mattermark.com/docs
- type: APIReference
  url: https://developer.mattermark.com/reference
- type: GettingStarted
  url: https://developer.mattermark.com/docs
- type: Pricing
  url: https://mattermark.com/pricing
- type: TermsOfService
  url: https://mattermark.com/terms
- type: PrivacyPolicy
  url: https://mattermark.com/privacy
- type: Blog
  url: https://mattermark.com/blog
- type: GitHubOrganization
  url: https://github.com/mattermark
- type: LLMsTxt
  url: llms/mattermark-llms.txt
- type: Authentication
  url: authentication/mattermark-authentication.yml
- type: Conventions
  url: conventions/mattermark-conventions.yml
- type: ErrorCatalog
  url: errors/mattermark-problem-types.yml
- type: RateLimits
  url: rate-limits/mattermark-rate-limits.yml
- type: Lifecycle
  url: lifecycle/mattermark-lifecycle.yml
- type: ChangeLog
  url: changelog/mattermark-changelog.yml
- type: MCPServer
  url: mcp/mattermark-mcp.yml
- type: Packages
  url: packages/mattermark-packages.yml
- type: Conformance
  url: conformance/mattermark-conformance.yml
- type: DataModel
  url: data-model/mattermark-data-model.yml
- type: DomainSecurity
  url: security/mattermark-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 13
  pass: local-v1