Verified Carbon Projects
All listed projects undergo independent third-party verification and meet rigorous quality criteria to ensure real climate impact.
Buy carbon credits with confidence. Fund what matters.
Whether you're purchasing a few tonnes or building a long-term climate strategy, we offer flexible solutions tailored to your needs. Access our marketplace and retire carbon instantly, or engage with our experts to curate an impactful portfolio.
How do you buy carbon credits?
You can buy carbon credits online in minutes: browse verified projects on the Carbonmark marketplace, choose one, enter the tonnage you want to retire, and pay by credit card or bank transfer. The credits are retired instantly in your name, and you receive a publicly verifiable retirement certificate as proof.
Why Buy Carbon Credits with Carbonmark Marketplace?
Seamless Offsetting at Any Scale
Whether you're offsetting 0.001 or 1,000,000 tonnes, Carbonmark makes it easy—through a user-friendly marketplace or API integration.
Global Supply, One Platform
Browse 150+ verified carbon projects across 20+ countries, spanning both established and emerging methodologies.
Real-time Retirement & Proof
Retire credits in seconds, with every transaction recorded on a publicly verifiable blockchain. Receive a digital certificate to showcase your climate action.
Verifiable provenance via our traceability tooling. Users can track a credit’s lifecycle, from registry issuance to final retirement.
Carbonmark
A Buyer’s Guide for Selecting Carbon Credits: Aligning Carbon-Offset Strategies
Not Sure Which Carbon Credits Are Right for You?
Download Our Buyer’s Guide for Selecting Carbon Credits.
A practical handbook to help you navigate the carbon market and align credit purchases with your broader business goals, brand identity, market positioning, and sustainability strategy.
This guide equips you with the tools to unlock the full potential of carbon markets—maximizing environmental impact while strengthening brand value.
Choose From Diverse Carbon Projects
We know what we sell. You know what you buy.
Explore a global selection of verified carbon projects spanning diverse methodologies and leading carbon registries. Whether you’re looking to buy carbon credits from nature-based solutions, renewable energy, or community-driven initiatives, Carbonmark offers a transparent and straightforward way to support projects that align with your sustainability goals.
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:
- From $767.90
- Tonnes available:
- 9.184
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 MoreIndicative pricing · live prices in the app
- Price per tonne:
- $19.50
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:
- From $9.78
- Tonnes available:
- 67,675.632
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 MoreIndicative pricing · live prices in the app
- Price per tonne:
- $11.05
How to Buy Carbon Credits with Carbonmark
Step 1 Go to our marketplace. Browse carbon projects by country or type of credits (e.g., forestry, blue carbon, etc.).
Step 2 Select the project you want to support and press the "Retire" button.
Step 3 Enter the number of tons you want to retire, the beneficiary's name, and the purpose of retirement (e.g., air travel).
Step 4 Pay with a credit card or bank transfer.
Step 5 Instantly receive your publicly available retirement certificate, which you can share on social media or in a PR campaign.
Step 6 If you want to offset your carbon emissions regularly and at scale, consider using the Carbonmark API, which can be seamlessly integrated into your corporate software.
Take Climate Action in a Few Clicks. Offset Emissions on Your Terms.
We make climate action simple and accessible. Whether you’re looking to invest in climate solutions to balance your carbon footprint or integrate programmatic offsetting into your software, Carbonmark empowers you to do so in real time and at any scale, from 0.001 to thousands of tonnes of CO₂e—as it should be in the 21st century.
Carbonmark is a compliance-grade solution that offers real climate accountability and regulatory readiness, with the depth required for thorough due diligence. Ideal for ESG reporting and investor assurance.
Still weighing your options? Compare seven carbon credit companies and providers on business model, minimum order, published fees and retirement APIs, or read our guide to how to buy carbon offsets if you are compensating for a specific footprint.
Portfolio Management, Quality Assurance and Due Diligence
We help you navigate a complex and fragmented market.
With 50+ years of combined experience in environmental markets, we bridge information gaps and provide the confidence needed to make informed decisions.
Our team conducts deep due diligence beyond standard documentation, including:
- Independent third-party interviews (e.g. NGOs operating locally)
- Assessment of project implementation and co-benefits
- Evaluation of long-term climate impact and delivery risk
Key facts
- Carbonmark is a marketplace for buying verified carbon credits: buyers can browse 150+ verified carbon projects across 20+ countries, spanning both established and emerging methodologies, at app.carbonmark.com.
- All projects listed on Carbonmark undergo independent third-party verification and meet rigorous quality criteria.
- Carbonmark supports offsetting at any scale, from 0.001 to 1,000,000 tonnes of CO2e, through a user-friendly marketplace or API integration.
- Credits retire in seconds, every transaction is recorded on a publicly verifiable blockchain, and buyers instantly receive a publicly available digital retirement certificate.
- How to buy: browse projects on the Carbonmark marketplace by country or credit type, press Retire, enter tonnes, beneficiary name, and purpose of retirement, then pay by credit card or bank transfer; the Carbonmark API supports regular, at-scale offsetting integrated into corporate software (carbonmark.com/api-and-integrations).
- Carbonmark's team has 50+ years of combined experience in environmental markets and conducts deep due diligence beyond standard documentation, including independent third-party interviews, assessment of project implementation and co-benefits, and evaluation of long-term climate impact and delivery risk.
- Carbonmark is a compliance-grade solution suited to ESG reporting and investor assurance, with real climate accountability and regulatory readiness.
Frequently asked questions
How much do carbon credits cost?
Carbon credit prices range from under $1 to more than $100 per tonne of CO₂e, depending on the project's methodology, technology, and vintage. Avoidance credits from established methodologies such as renewable energy are typically the least expensive, while engineered carbon removal commands premium prices. Every Carbonmark listing shows the full price before you pay, with no hidden fees.
How do I purchase carbon credits for my business?
Businesses can purchase carbon credits directly on the Carbonmark marketplace — browse verified projects, retire the tonnage you need, and pay by credit card or bank transfer. For recurring or high-volume offsetting, the Carbonmark API integrates programmatic purchases into your own software, and our team can help curate a credit portfolio aligned with your sustainability strategy.
Can individuals buy small amounts of carbon credits?
Yes. Carbonmark supports fractional retirement from as little as 0.001 tonnes (1 kg) of CO₂e, so individuals can offset a flight, a commute, or a year of emissions in a few clicks and pay by credit card. You receive the same publicly verifiable retirement certificate as an enterprise buyer.
What happens after I buy carbon credits?
Your credits are retired — permanently removed from circulation so they can never be resold or double-counted. The retirement is recorded on a publicly verifiable blockchain, and you instantly receive a digital retirement certificate naming the project, tonnage, and beneficiary, which you can share in reports, PR, or social media.
Which carbon credits should I buy?
It depends on your goals. If you want maximum climate impact per dollar, established avoidance projects offer low-cost verified reductions; if durability and innovation matter most, carbon removal projects like biochar or blue carbon may fit better despite higher prices. All projects on Carbonmark undergo independent third-party verification, and our Buyer's Guide walks through how to align credit selection with your strategy.