# Mattermark

**Canonical:** https://apis.io/providers/mattermark/  
**Website:** https://mattermark.com  
**APIs profiled:** 2

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.

## Kin Score — 51.0 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: rising (+24.0 from 27.0).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 56.3 |
| Governance | 11.5 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 63.0 |
| Commercial Clarity | 63.2 |

## Agent readiness — 51.4 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | yes |
| MCP Server | derived |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | yes |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (2)

- **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. Read-only: the published schema declares 57...

## MCP servers (1)

- **mattermark-mcp.yml**

## Agentic access (1)

- **Mattermark Agentic Access** — 11 operations · 1 acting

## Security (2)

- **Mattermark Authentication** — apiKey/http · 2 schemes
- **Mattermark Domain Security** — TLSv1.3

## Plans (1)

- **Mattermark Plans Pricing**

## Tags

Company, Business Intelligence, Company Data, Investors, Funding, Sales Intelligence, Market Research

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/mattermark/). Scores are computed from the provider's own public artifacts under a published rubric.