
"The voluntary carbon market is essential in mitigating the effects of climate change and creating a sustainable future. Our collaboration with OCELL, Klim, RSS and Open Forest Protocol will help us guarantee that the climate solutions financed through our marketplace are of the highest possible quality and have a real and measurable impact."
Ebrahim Attarzadeh, CEO of Callirius

Joining forces to revolutionize the VCM, OCELL, Klim GmbH, RSS GmbH, Open Forest Protocol and Callirius AG are implementing and enabling cutting-edge dMRV processes, ensuring transparency, integrity, and trust in every aspect of carbon project development and carbon credit transactions. The remote sensing and monitoring tools developed by OCELL, the integrated dMRV processes at Klim, the digital monitoring and verification of projects at RSS, and the decentralized proof-of-impact data platform of Open Forest Protocol, usher in a new era of climate action. These partnerships lay the foundation for continuous project monitoring on the Callirius marketplace that will foster greater collaboration and trust among all stakeholders in the VCM and redefine the standards for the whole industry.
“Although climate protection can be driven forward with technical innovations, it is not possible without the involvement of nature and the environment. Klim’s digital platform combines nature-based solutions with innovative technology and scientific knowledge to support farmers in their conversion to regenerative agriculture. We are proud to promote high-quality, nature-based climate solutions in partnership with trusted allies.”
Robert Gerlach, CEO at Klim
"OCELL is delighted to work alongside Callirius to bring our digital forest inventory technology and carbon credits to the forefront of the voluntary carbon market. Our technology helps ensure the validity and precision of carbon credits and favours the development of innovative nature-based solutions to tackle the climate crisis."
Christian Decher, co-CEO at OCELL
"Open Forest Protocol is thrilled to be partnering with Callirius and their partners as our two organizations are very much aligned on the necessity for enhanced transparency and quality of projects from their inception phase. We look forward to providing the transparency and accountability needed to build trust and confidence in the carbon credits market."
Frederic Fournier, CEO at Open Forest Protocol
"Remote Sensing Solutions (RSS) is proud to be a part of this partnership, which comes at the right time and with high expectations. We are excited to innovate the voluntary carbon market with our VerifAId-Transparency platform and to establish dMRV as a central pillar of nature-based solutions that have a high impact in scale and quality."
Jonas Franke, Managing Director of RSS

About Callirius
Callirius’ mission is to bring private capital directly to climate impact through a digital marketplace, providing climate solutions with access to new funding sources while giving enterprises & investors access to high-integrity nature-based climate projects. At Callirius, quality and integrity are based on a scalable data-driven, science-backed, and fully-regulated framework. Our AI-powered Callirius Quality Engine and due diligence identify the overall positive impact on climate, nature and society.
About OCELL
OCELL provides cutting-edge technologies for forestry, allowing forests to fully realise their potential as a sustainable resource and a highly efficient carbon dioxide reservoir. OCELL’s “Dynamic Forest” makes forest management information digitally accessible and actionable, making planning in the woods easier and more transparent. Based on the combined and holistic data from remote sensing and terrestrial measurements, OCELL generates high-quality and transparent carbon credits.
About Klim
Klim brings together farmers, businesses and consumers to make agriculture part of the climate solution. Klim enables farmers to digitally document climate protection services and unlock financial remuneration for verified activities.
About RSS
RSS is one of Germany’s leading value-adding companies for environmental monitoring using Earth Observation. RSS implements cutting-edge satellite monitoring technologies and AI-based image analysis to support land-based carbon projects. The VerifAId platform helps customers to monitor, report and verify the impacts of NbS (verifAId.ai).
About Open Forest Protocol
Open Forest Protocol is a scalable, on-chain platform that allows forest projects of any size, from around the world, to Measure, Report, and Verify (MRV) their forestation data.
Through OFP, individuals, communities, NGOs, entrepreneurs, and governments can create transparent, immutable, proof-of-impact data that is comprehensively verified by a network of independent experts. OFP is building the foundation for more inclusive, scalable, and data-backed financing mechanisms for nature-based climate solutions.
For more information, please contact: Michael Grohmann (Head of Project & Policy at Callirius) or Marina Herías Sáenz (COO at Callirius)