List for Free. Reach More Buyers.
Carbonmark offers zero-cost onboarding and access to a growing global network of climate-conscious buyers.
List Once. Sell Globally.
Carbonmark offers open market access for verified carbon credits.
Start selling your carbon credits directly to buyers: list your projects and create your storefront to generate new demand.
- retired on behalf of our clients
- 1,000,000+ tCO2
- carbon projects listed
- 150+
- continents where we operate
- 6
Sell Faster. Sell Smarter. Sell More with Carbonmark.
Own Your Credits. Set Your Price.
Reach buyers without restrictions or exclusivity requirements.
One Platform. Multiple Channels.
List once and sell across our public marketplace, enterprise API integrations, and in-house sales outreach.
Sell with Confidence. Get Paid Instantly.
Carbonmark ensures traceability, instant settlement, and full transparency for every transaction.
Registry Integrations
Carbonmark is connected to leading carbon registries, including Puro.Earth, EcoRegistry, ICR, and more. Users can easily transfer credits from their host registry to their Carbonmark account for listing on our platform.
Direct Credit Issuance
Issue your credits faster through Carbonmark Direct. We invite project developers of innovative carbon removal technologies to issue and market their credits through our public, blockchain-enabled platform.
With Carbonmark Direct You Can:
- Issue credits through our secure, traceable, and transparent blockchain-based infrastructure.
- Manage your credit inventory, execute retirements on behalf of buyers, and transfer credits to third parties.
- List and sell carbon credits on our public marketplace or offer them via our API to our client network.
The entire process takes up to 3 weeks from submitting your application and project documentation.
Where Climate Action Gets Funded
Carbonmark is the fastest way to bring your carbon credits to market.
We offer project developers and credit suppliers a frictionless, transparent platform to list, manage, and sell credits—without intermediaries or upfront fees. With free onboarding, instant access to a global buyer base, and support from our in-house sales team, you stay in control of your credits and pricing while tapping into new demand channels.
Our Partners and Network
Key facts
- Carbonmark offers open market access for verified carbon credits: sellers list projects and create a storefront to sell directly to buyers globally.
- Listing is free — Carbonmark provides zero-cost onboarding with no exclusivity requirements, and sellers own their credits and set their own price.
- One listing sells across multiple channels: Carbonmark's public marketplace (app.carbonmark.com), enterprise API integrations, and in-house sales outreach.
- Track record: 1,000,000+ tCO2 retired on behalf of clients, 150+ carbon projects listed, and operations across 6 continents.
- Every transaction has traceability, instant settlement, and full transparency — sellers get paid instantly.
- Carbonmark is connected to leading carbon registries, including Puro.Earth, EcoRegistry and ICR; sellers can transfer credits from their host registry to their Carbonmark account for listing.
- Carbonmark Direct lets project developers of innovative carbon removal technologies issue credits on Carbonmark's public, blockchain-enabled platform; the entire process takes up to 3 weeks from submitting the application and project documentation (carbonmark.com/carbonmark-direct).
Frequently asked questions
How do you sell carbon credits?
To sell carbon credits, list them where buyers are already looking. On Carbonmark, onboarding as a supplier is free: transfer credits from your host registry to your Carbonmark account, set your own price, and list them on the public marketplace. Your listing is also exposed to enterprise buyers through the Carbonmark API, x402 endpoint, and via our in-house sales outreach.
Who buys carbon credits?
Carbon credits are bought by companies offsetting emissions as part of their Net Zero and ESG commitments, by consultancies and service providers purchasing on behalf of clients, by software platforms that embed offsetting into their products through APIs, and increasingly by individuals and AI agents. Listing on Carbonmark exposes your credits to all of these buyer channels at once.
How much does it cost to list carbon credits on Carbonmark?
Nothing. Carbonmark offers zero-cost onboarding with no upfront fees and no exclusivity requirements. You keep ownership of your credits and set your own price; fees apply only to buyers when a transaction occurs.
Which carbon registries does Carbonmark support?
Carbonmark is connected to leading carbon registries, including Puro.Earth, EcoRegistry, and ICR, with additional integrations ongoing. Suppliers transfer credits from their host registry to their Carbonmark account for listing or issue them directly to their account via Carbonmark Direct. Carbon retirements are linked back to registry records on a one-to-one basis where the registry supports it.