Introduction to Carbonmark API

Explore carbon market data, select and retire carbon programatically.


Carbonmark is a peer-to-peer platform for listing, selling and retiring carbon credits.

The Carbonmark Application Programming Interface (API) allows you to programatically access the growing supply of verified credits on the platform, automating the procurement process for your application.

Benefits of Carbonmark API include

  • Real-time quoting and pricing.

  • Instant transaction settlement complete with certificate.

  • Ability to offset fractional quantities, e.g. 0.8 tCO2 or 1.6 tCO2.

  • No need to carry inventory. Simply route orders through the API and receive an invoice at end of month.

Getting started with Carbonmark API

Get access and complete your first retirement with the QuickStart guide below.


Carbonmark API Reference Documentation

You can find the latest API Reference docs of the Carbonmark REST API at

The root domain is always running the latest version of the code on the main branch of the monorepo. As mentioned above, any breaking changes and hotfixes will be tagged with a version number in the monorepo.

These are generated from an OpenAPI JSON spec that is auto-generated from our Fastify schemas. The raw JSON spec is not kept in source control-- it can be accessed at

Fastify schemas are co-located with the respective route handlers, except for the root OpenAPI config, which is located in src/plugins/open-api.ts. For more info, see the @fastify/swagger plugin docs.


You can find the code repository for the Carbonmark REST API in the this monorepo - each version number can be found under tags.

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