For Buyers
Discover and retire a global selection of verified carbon credits with full price transparency and instant settlement via our open marketplace or API.
Retire CarbonGlobal Carbon Credits Marketplace
Scaling climate finance,
for every market actor.
Digital infrastructure connecting buyers, sellers, developers, and AI agents across environmental markets.
- 1,000,000+ tCO2
- retired on behalf of our clients
- 150+
- carbon projects we support
- 500+
- orders for the last 24 hours
Building an open, scalable, and impactful carbon market
Our carbon credit marketplace connects high-impact environmental projects with critical financing.
- Retailers
- Buyers
- Exchanges
- SaaS & Fintech
- Registries
- AI Agents
- Project Developers
- Brokers
Carbonmark is the climate infrastructure layer for the next generation of the carbon market—delivering connection, transparency, speed, and accessibility to carbon markets.
With real-time pricing, traceability of each tonne of CO₂, and scalable APIs, Carbonmark provides end-to-end visibility and control across credit issuance to retirement.
Our Partners
For Sellers
List your carbon credits from supported registries on our marketplace for free and tap into the global demand via our platform.
Become a Supplier
For Software Developers
Enhance value for your customers by integrating automated carbon offsetting into your corporate sustainability software or consumer-facing app using our API.
Build with Purpose
For AI Agents
Carbonmark is agent-ready. Autonomous agents can discover credits, get live quotes, and execute verifiable retirements through our x402 endpoint and MCP integration.
Explore Agentic TransactionsPowering Carbon Markets That Work
Carbonmark connects all market participants, from pioneering project developers to climate-conscious businesses and individuals, with a frictionless, user-first carbon credits marketplace to sell, retire carbon credits, and integrate offsetting across digital products via our API.
Our aim is to help a diverse group of project developers and suppliers get to market efficiently, and ensure every buyer can find high-integrity projects that align with their sustainability goals and brand identity.
Our open infrastructure accelerates the flow of climate finance to where it’s needed most, and ensures every transaction is verifiable and secure.
The result: more capital is directed to climate projects, while buyers gain unmatched control over their positive climate impact.
Leveraging Blockchain for Scalable Climate Impact
A new wave of innovation is reshaping how the voluntary carbon market operates. Alongside emerging frameworks and regulations, blockchain technology is driving greater transparency, efficiency, and trust.
This transformation is essential — the VCM must scale tenfold in the coming years if humanity is to meet its climate goals. Modernizing the entire carbon market infrastructure is key to making it both high-integrity and future-ready.
In our latest report, we explore the pivotal role of blockchain in this process and highlight some of the pioneers leading the way.
Learn more in Carbonmark’s Report.
The Engine Behind Credible Climate Action
Trust Your Impact
From sub-tonne retirements to large-scale offsets, every credit is traceable and verifiable on the blockchain—instantly and transparently.
Support Real Climate Solutions
Your purchase provides direct funding to verified, high-integrity environmental projects on the ground, working to combat climate change.
Champion Open Climate Finance
Carbonmark is part of a growing shift toward transparent, interoperable, and efficient carbon markets that serve people and the planet.
Take Climate Action in Seconds
From individuals to corporations and governments, Carbonmark empowers everyone to be part of the solution within a few clicks and with full transparency.
Built for the Agentic Web
AI agents don’t browse — they transact.
Carbonmark’s infrastructure lets any agent or HTTP client take climate action in four steps: Discover available carbon credits, quote live market prices, retire credits in a single approved transaction, and receive a public Carbonmark certificate as permanent proof.
Our tooling enables verifiable climate action at machine speed.
- Step 1
Discover
Agent lists retirable carbon credits, projects, and available liquidity
GET /discover - Step 2
Quote
Live onchain price for the exact tonnage, with all fees included
GET /quote - Step 3
Retire
One approved transaction permanently retires the credit
GET /prepare/retire - Step 4
Certificate
Public Carbonmark proof — verifiable onchain, forever
GET /certificate
Choose From Diverse Carbon Projects
Fund Ocean Alkalinity Enhancement in Italy
Limenet is an Italian climate tech startup pioneering carbon removal through its patented pH-equilibrated Ocean Alkalinization technology. By mimicking natural processes, Limenet permanently stores CO₂ in seawater as calcium bicarbonates.
Learn MoreLive pricing
- Price per tonne:
- $650.00
- Tonnes available:
- 9
Support Organic Waste Composting in the USA
The Black Earth Organic Waste Compost project in Massachusetts, USA, is an organic waste composting initiative operational since December 1, 2021, diverting food waste from landfills to reduce 7,000 tCO2e annually.
Learn MoreLive pricing
- Price per tonne:
- $21.00
- Tonnes available:
- 5,391
Drive Paraguay's Reforestation
The Forestal Río Aquidabán project is restoring 301 hectares of degraded grasslands in Concepción, northeastern Paraguay, through a silvopastoral agroforestry system that integrates reforestation with sustainable cattle ranching.
Learn MoreLive pricing
- Price per tonne:
- $9.77
- Tonnes available:
- 67,940
Sequester Carbon in Argentina
The Urunday Afforestation Project in Corrientes, Argentina, has restored 3,143 hectares of degraded grasslands into FSC-certified eucalyptus forests, set to remove over 1 million tonnes of CO₂e.
Learn MoreLive pricing
- Price per tonne:
- $11.90
- Tonnes available:
- 681
What Our Clients and Partners Say
With Carbonmark's advanced platform, we can accelerate the trade of carbon credits while ensuring the communities we work with benefit directly from these projects. Together, we're creating a model for how nature-based solutions and innovative finance can drive environmental and social impact.
Paul Flynn
Founder and Trustee, GRO Foundation
Together with Carbonmark, we aim to create a more inclusive and transparent marketplace that empowers organisations and individuals to contribute more effectively to the fight against climate change.
Seth Elliott
CEO, XTCC
Through collaboration with Carbonmark, we're providing more than 27 million users with a straightforward and accessible pathway to engage in carbon offsetting. This initiative empowers individuals to actively contribute to climate change mitigation, making sustainability a practical, everyday choice.
Charukan Kaewjinda
Head of Business, Ascend Bit Company
Carbonmark’s Blog
Your resource for positive climate impact
Carbonmark at a glance
- Carbonmark is a global carbon credits marketplace: digital infrastructure connecting buyers, sellers, developers, and AI agents across environmental markets.
- Scale: 1,000,000+ tCO2 retired on behalf of clients across 150+ supported carbon projects.
- For buyers: discover and retire verified carbon credits with full price transparency and instant settlement via the open marketplace (app.carbonmark.com) or API.
- For sellers: list carbon credits from supported registries for free.
- For developers: REST API for automated carbon offsetting (carbonmark.com/api-and-integrations).
- For AI agents: x402 endpoint and MCP integration for autonomous discovery, quotes, and verifiable onchain retirements (carbonmark.com/ai-agents).
- Every retirement produces a public, permanently verifiable onchain Carbonmark certificate.