Regenerating the voluntary carbon market through high-quality climate solutions. We enable financing for high-quality climate solutions through a data-driven, science-backed, and well-regulated framework.

Learn how Callirius
can provide you with impactful carbon credits.
Invest in climate solutions
Through carbon credits, you can invest in climate solutions which have positive social and environmental impact.
Support local projects
Investing in carbon credits issued by local projects generates higher biodiversity and creates positive social impact.
Kickstart your net zero journey
Reducing your carbon footprint is the first step in becoming a net zero business. Carbon credits help you achieve this.
Enable the 1.5°C pathway
Carbon credits make climate solutions more financially viable. Helping us reach the goals of the Paris Climate Agreement and fight climate change.

Learn how Callirius

can market your climate project.
Get funding for your project
If you’re looking to fund your high-impact carbon project, Callirius is the platform for you.
Sell on a transparent marketplace
Sick of hidden fees and questionable ethics? Callirius is the marketplace for transparent carbon projects.
Benefit from higher prices…
Your project will be sold directly to the customer using the Callirius platform. Better for the customer and for your margins.
and lower fees
There are no middlemen at Callirius. You won’t have to pay any extra fees to fund your carbon projects.

Why Callirius

High Quality

We manage a dynamic and diverse climate portfolio with nature-based climate solutions around the globe. All climate solutions are screened to ensure quality, passing strict evaluation criteria. This way we can maximise your climate impact.​


We ensure full transparency on all of our solutions. Tracking your carbon credits on-chain means every transaction is transparent and easy to access, eliminating hidden pricing and unnecessary red tape. You get the relevant carbon certificates at the right price. ​


Our climate projects create true community impact by focusing on solutions that strengthen the local biosphere. We work exclusively with projects which guarantee a net positive impact on the environment, biodiversity, social justice, and human rights. ​

All About Carbon Offsets

The founding team

Co-founder, CEO & Chairman

Ebrahim Attarzadeh

Co-founder, Head of Distribution

Rudolf Maier

Co-founder, Head of Project & Policy

Michael Grohmann

Co-founder, Head of Product & Technology

Tim Schuldt


What you do makes a difference, and you have to decide what kind of difference you want to make.

Dr. Jane Goodall

Partner with the planet.

Reach net zero with Callirius.

Carbon removal can be overwhelming. Callirius is here to make it real.