Callirius
Callirius is a Frankfurt- and Switzerland-based marketplace and asset manager, founded in 2022, that finances high-integrity nature-based carbon removal projects by connecting project developers with enterprises and institutional investors via its curated platform, Carbon Removal Fund, and proprietary Quality-AI screening framework.
- Company typePrivate
- Founded2022
- HeadquartersFrankfurt, Germany
- Headcount11–50
- GTM typeB2B
- OfferingDigital Commerce or Content
What Callirius does
Callirius is a Frankfurt- and Pfäffikon SZ-based financial technology and marketplace operator founded in 2022 that intermediates financing for high-integrity, nature-based carbon removal projects. The company runs a dual-sided platform (app.callirius.com) connecting project developers — forest owners, farmers, biochar producers, and regenerative agriculture operators — with enterprises and institutional investors seeking to finance nature-based climate solutions as part of their decarbonisation and CSRD/ESG strategies. All projects offered on the platform are screened through a proprietary Quality-AI and the Callirius Quality Framework, which evaluates projects across six dimensions including additionality, permanence, baseline scenario, SDG alignment, external factors, and owner diligence, with continuous rather than one-time screening.
Underlying the marketplace is a technology stack integrating remote sensing, machine data, soil samples, and camera trap data via partnerships with digital MRV providers such as Cula Technologies and Explorer.land, supporting ongoing verification of project performance. Callirius monetises through three revenue streams: marketplace commissions on carbon credit transactions, a flagship closed-end Carbon Removal Fund providing diversified early-stage project exposure to enterprise and institutional investors, and professional/advisory services for project developers covering financing structure design and go-to-market support. Distribution combines a consultative enterprise field-sales motion with a curated self-serve marketplace portal, supported by a bilingual content marketing programme and event presence including COP28. Confirmed enterprise customers include Bayer, and the company operates under regulated German investment brokerage (WpIG tied-agent) status via its Frankfurt subsidiary and partner Effecta GmbH.
Callirius firmographics
Firmographics- Name
- Callirius
- Legal name
- Callirius AG
- Website
- https://callirius.com
- Company type
- Private
- Founded year
- 2022
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Callirius is a Frankfurt- and Switzerland-based marketplace and asset manager, founded in 2022, that finances high-integrity nature-based carbon removal projects by connecting project developers with enterprises and institutional investors via its curated platform, Carbon Removal Fund, and proprietary Quality-AI screening framework.
- Ownership category
- akta.pro rank
Callirius industry classification
Industry- Product category
- Voluntary Carbon Market Platform
- NAICS
- Environmental Consulting Services (541620)
- SIC
- Services-Management Services (8741), Services-Computer Programming, Data Processing, Etc. (7370)
- akta.pro primary industry
- Carbon Removal Project Development, Financing & Offtake (Developers, Aggregators, Buyers Clubs) (EUABAFAL)
- akta.pro secondary industries
- Carbon Offtake Structuring & Contracting (ERPA, Long-term Offtakes, Price Floors) (EUABADAE), Carbon Finance & Investment Advisory (Project Finance, Funds, SPVs) (EUABADAD)
Keywords
Where Callirius is headquartered
LocationHeadquarters
- HQ city
- Frankfurt
- HQ country
- Germany
- HQ region
- Europe
Offices3 records
Markets served
Callirius business model
Business model- GTM type
- B2B
- Offering type
- Digital Commerce or Content
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations
Revenue model
- Marketplace Commission / Platform Fees: Callirius acts as a marketplace platform connecting project developers with enterprises and investors. Revenue is generated through fees charged for facilitating transactions of carbon credits. The company states it aims to reduce the carbon market value chain and keep only value-adding participants, with the goal of lower fees compared to traditional intermediaries.
- Carbon Removal Fund (Closed-End Investment Fund): Callirius operates a nature-based Carbon Removal Fund structured as a closed-end investment vehicle. The fund finances early-stage, high-impact nature-based carbon removal projects and offers investors (primarily enterprises) diversified exposure to a portfolio of projects. Returns are realised through appreciation of carbon credit values and fund distributions. This is a flagship financial product positioning nature as an asset class.
- Professional Services for Project Developers: Callirius provides structured financing solutions, process development, and sales structuring for project developers seeking funding. Services include risk assessment, financing structure design, and go-to-market support for carbon credit issuance. Fees are charged for these advisory and structuring services.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Pay-as-you-go | Carbon credit prices for nature-based solutions (NBS) |
| Other | Multi-year contract | Carbon Removal Fund investment units |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels5 records
Callirius product offering
Product offeringCore offering
Callirius operates a regulated, dual-sided marketplace (app.callirius.com) that curates high-integrity nature-based carbon removal projects and connects them to enterprise buyers and investors seeking carbon credits and climate investments. It supplements the marketplace with three investment vehicles — a closed-end Carbon Removal Fund, long-term offtake agreements, and direct project financing — and uses a proprietary Quality-AI and expert screening framework to pre-filter projects across six impact dimensions.
Product overview
Callirius operates a unified platform marketplace for financing nature-based climate projects and purchasing carbon credits. The core offering is the Callirius Marketplace Platform (accessible at app.callirius.com) and Project Portal, which together enable enterprises and investors to discover, evaluate, and directly finance pre-screened climate projects. Complementing the marketplace, Callirius offers three structured investment products: the Carbon Removal Fund (a closed-end diversified portfolio fund), Long-term Carbon Removal Offtake Agreements (supply-pre-commitment contracts), and Direct Project Financing (co-investment in specific projects). All projects on the platform are evaluated using the Callirius Quality Framework, which applies a proprietary Quality-AI combined with expert manual screening across six impact dimensions. Project developers can submit projects via a Pre-Qualification Form and proceed through a structured six-step process (pre-screening, methodology verification, risk assessment, financing structuring, process development, sales structuring). The platform covers project types across wetlands, forests, agriculture, soil, and oceans.
Differentiator
Problem solved
Functional benefit
Products and services
- Callirius Marketplace Platform Dual-sided marketplace that connects enterprises and investors with high-quality nature-based climate projects across wetlands, forests, agriculture, soil, and ocean ecosystems, enabling direct financing and purchase of carbon credits with transparent pricing and terms.
- Carbon Removal Fund Closed-end investment fund providing diversified exposure to a portfolio of high-quality, nature-based carbon removal (CDR) projects, providing early-stage financing to climate projects while mitigating risk through diversification.
- Long-term Carbon Removal Offtake Agreements Long-term offtake contracts providing enterprises with immediate access to future CO2 certificates through prepayment or purchase commitments at pre-defined prices, securing supply ahead of regulatory tightening.
- Direct Project Financing Long-term engagement or co-investment in specific individual climate projects, enabling deeper involvement and customized financing structures aligned with project lifecycles.
- Pre-Qualification and Financing Structuring Service for Project Developers Six-step structured service for project developers covering pre-screening, methodology verification, risk assessment, financing structuring, process development, and sales structuring, providing advisory and structuring support on a fee basis.
Quantifiable outcome
- NBS climate certificates range from EUR 10 to EUR 50 per tonne of CO2
- +1 more outcomes
Companies that use Callirius
Customer profileNamed customers1 record
Segments2 records
Ideal customer profiles2 records
Callirius technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration2 records
AI capability1 record
Feature3 records
Callirius partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core and minor.
- Cula TechnologiescoreCallirius and Cula Technologies formed a strategic partnership to scale high-impact biochar projects. Cula Technologies provides a monitoring platform based on machine data, tracking data, and laboratory data for accurate and reliable monitoring of the entire biochar production and usage process. Data flows via API to Carbon Standards International for verification. Callirius integrates this data into its platform and markets the resulting CO2 certificates. This partnership directly addresses quality concerns and fraud risk in the biochar carbon market by replacing manual data entry with automated, transparent data flows.
- BLOCK PflanzenkohleminorBLOCK Pflanzenkohle operates one of the first two plants worldwide integrating machine data into biochar verification, using Carbo-FORCE pyrolysis technology. Located in Dithmarschen, Schleswig-Holstein, the project sources biomass from neighbouring farms, processes it into biochar, and applies it to regional agricultural land. Callirius co-markets BLOCK's resulting CO2 certificates, and Cula Technologies monitors all production steps. This project is a live demonstration of the Callirius-Cula partnership in action.
- KlimcoreKlim is a German AgriTech company leading the transformation to regenerative agriculture. Callirius partnered with Klim to co-market CO2 certificates generated through regenerative agricultural practices on Klim's platform. Callirius makes Klim's regenerative agriculture CO2 certificates accessible through its marketplace portal. The collaboration aims to scale regenerative farming practices by providing financial incentives through the voluntary carbon market, supported by digital MRV systems for transparent measurement.
- Effecta GmbHcoreCallirius GmbH acts as a tied agent pursuant to section 3 para. 2 of the German Investment Firm Act (WpIG), operating in investment brokerage exclusively for the account and under the liability of Effecta GmbH, Florstadt. This is a critical regulatory compliance relationship enabling Callirius to conduct regulated investment brokerage activities in Germany.
Scale indicators4 records
Recent moves8 records
Expansion highlights6 records
Callirius competitors and assessment
Company assessmentDirect peers
- Pachama: AI- and satellite-based marketplace for nature-based carbon credits with integrated MRV. Direct competitor to Callirius in the high-integrity nature-based credit space, serving enterprise buyers on both sides of the marketplace.
- Patch: Carbon credit API and marketplace simplifying access for enterprises. Comparable to Callirius in connecting developers with corporate buyers, though more API/PLG and less fund-vehicle oriented.
- Cloverly: Carbon-offsetting API platform curating credits for enterprises, with emphasis on quality ratings and integrations. Competes with Callirius for corporate carbon procurement budgets.
- Carbonfuture: End-to-end platform for durable carbon removal credits (biochar, DAC), with MRV and marketplace. Closely comparable to Callirius's biochar and CDR project mix and quality-verification narrative.
- Klim: German AgriTech regenerating agriculture with CO2 certificate marketplace. Already a Callirius partner (co-marketed regenerative ag certificates) but also a potential competitor in the German developer-to-enterprise funnel.
Emerging players
- Sylvera: Independent carbon credit ratings provider using satellite and ML to rate nature-based projects. Overlaps with Callirius's Quality Framework function and could become a buy-side standard that displaces in-house ratings.
- Klima: Consumer- and SME-facing carbon removal app with a project marketplace. Partially overlapping with Callirius's project financing model, but focused on smaller ticket sizes and retail accessibility.
- BeZero: Independent ratings agency for the voluntary carbon market. Adjacent to Callirius's quality-assessment moat and likely to be a partner-or-threat dynamic in the enterprise buyer journey.
Broad incumbents
- South Pole Group: Large incumbent carbon project developer and advisory with end-to-end climate solutions. Comparable to Callirius on the developer/buyer intermediation layer but at much greater scale and with a broader services portfolio.
Others
- Charm Industrial: Engineered carbon removal (bio-oil injection) startup that also operates long-term offtake agreements. Comparable to Callirius on the offtake-contract and pre-financing structure, but on the engineered rather than nature-based side.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
Callirius social profiles
Digital presenceCallirius financial estimates
Financial estimateRevenue estimate
Valuation estimate
Callirius leadership team
Management profileNumber of profiles
Profiles5 records
Callirius subsidiaries and ownership
Company hierarchySubsidiaries1 record
Callirius funding detail
Funding detailFunding overview
Funding rounds1 record
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Callirius M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Callirius
What does Callirius do?
Callirius operates a regulated, dual-sided marketplace (app.callirius.com) that curates high-integrity nature-based carbon removal projects and connects them to enterprise buyers and investors seeking carbon credits and climate investments. It supplements the marketplace with three investment vehicles — a closed-end Carbon Removal Fund, long-term offtake agreements, and direct project financing — and uses a proprietary Quality-AI and expert screening framework to pre-filter projects across six impact dimensions.
Is Callirius a public or private company?
Callirius is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Callirius founded?
Callirius was founded in 2022. It employs 11 to 50 people.
Where is Callirius based?
Callirius is headquartered in Frankfurt, Germany, in the Europe region.
How does Callirius make money?
Three revenue lines are on record. Marketplace Commission / Platform Fees are the primary driver. The others are carbon Removal Fund (Closed-End Investment Fund) and professional Services for Project Developers.
Who are Callirius's main competitors?
Direct peers on record are Pachama, Patch, Cloverly, Carbonfuture and Klim. Emerging players are Sylvera, Klima and BeZero. South Pole Group is listed as a broad incumbent. Charm Industrial is listed as an others.
Does Callirius have an API?
No public API is recorded for Callirius.
What industry is Callirius in?
Callirius's product category is Voluntary Carbon Market Platform. Its primary akta.pro industry code is EUABAFAL, Carbon Removal Project Development, Financing & Offtake (Developers, Aggregators, Buyers Clubs), with a secondary code of EUABADAE, Carbon Offtake Structuring & Contracting (ERPA, Long-term Offtakes, Price Floors). Its NAICS code is 541620 and its SIC code is 8741.