Mattermark GraphQL API


The Mattermark GraphQL API allows you to query our expansive dataset of companies through a new unified interface.

Base URL

All URLs referenced in the documentation have the following base:


The Mattermark API is served over HTTPS. To ensure data privacy, unencrypted HTTP is not supported.


To assist in your integration process, we provide a sandbox endpoint with static data and no quota limits. Using 08e723e5b6e9e9f64784e2500d240d7ef3a567e39347327be792c2805a1c2d20 as the key, simply change your hostname to: