The Carbon Marketplace
The Carbon Marketplace

Buy verified carbon credits with confidence

Direct access to the world’s best climate projects. Twenty years of carbon expertise combined with market-leading ratings data, so funding climate action is simple, transparent and powerful, with greenwashing fears behind you.

Browse the marketplaceSee how it works
20+
years of carbon expertise
Instant
proof of purchase and certificate
All-in
pricing, every fee included
Global
portfolio of climate projects
Only verified projects: Verra VCS & Gold StandardICVCM CCP filteringAll-in pricingRetired on the registry in your nameSecure checkout via Stripe
How it works

A simple path to a powerful impact

From sign-up to a retired credit and a certificate in your inbox. No brokers, no minimum order, no waiting weeks for confirmation.

  1. Step 01 · Register
    Meaningful climate action starts here
    Under a minuteto register
    Step 01 · Register

    Meaningful climate action starts here

    Register for free to access a global marketplace of high-impact carbon projects. Your journey to net zero begins with a single click.

    • Free to join, with no commitment
    • No card details required to sign up
    • Secure access to your account anytime
  2. Step 02 · Discover
    A world of impactful projects
    1,800+rated projects
    Step 02 · Discover

    A world of impactful projects

    From wind farms in Asia to clean water initiatives in Africa, explore a diverse portfolio. Find the project that best tells your environmental story.

    • Sort by type, region, registry or impact
    • Independently rated for quality and credibility
    • Full project detail, no black boxes
  3. Step 03 · Verify
    Invest with unwavering confidence
    VerifiedVerra & Gold Standard
    Step 03 · Verify

    Invest with unwavering confidence

    We provide access to projects verified by leading standards. Filter for ICVCM Core Carbon Principles approved credits to ensure your contribution is genuine and effective.

    • Verra VCS and Gold Standard verified
    • Filter for ICVCM CCP-approved credits
    • An independent CRISP rating on every project
  4. Step 04 · Align
    Align your impact with your values
    17 SDGsfilterable
    Step 04 · Align

    Align your impact with your values

    Use our powerful filters to select projects by type, region, and even by their contribution to specific UN Sustainable Development Goals (SDGs).

    • Target the UN SDGs that matter to you
    • Mix and match projects in one purchase
    • Or let us blend a portfolio across removals and avoidance
  5. Step 05 · Certify
    Your commitment, certified and secure
    Instantproof of impact
    Step 05 · Certify

    Your commitment, certified and secure

    Pay securely online or download an invoice. Once complete, you can instantly download your official certificate to showcase your vital contribution.

    • Pay by card in GBP, USD or EUR, or by invoice
    • Certificate available the moment you buy
    • Credits retired on the registry in your name
The intelligence layer

Every project carries a CRISP rating

CRISP, the Carbon Ratings InSight Platform, is our independent rating system. Every project is assessed through the same transparent process, so ratings are comparable across project types, standards and countries.

  1. Review the project documentsPDDs, verification and monitoring reports, read end to end.
  2. Apply the AI-assisted algorithmThe project is rated out of 5 on each of the five criteria.
  3. Award the overall ratingThe average of those ratings, with a written justification for each.
Explore the rating system

  • Additionality

    Would the project have gone ahead anyway? If it was already viable without carbon finance, your money is not creating new climate impact.

  • Permanence

    How long does the reduction stay locked away, and what is the risk of reversal through fire, disease, felling or a change of land use?

  • Quantification

    Can the reductions be measured accurately and repeatably, under a methodology that stands up to independent verification?

  • Leakage

    Does protecting one hectare simply push the deforestation next door? Credible projects account for emissions displaced beyond their boundary.

  • ICVCM CCP status

    Whether the project’s methodology has been submitted, assessed and approved under the Core Carbon Principles.

Your guarantee

Every sale, matched by a retirement

When you buy on COMP, the credits are retired on the appropriate registry in your name, permanently and verifiably. They can never be resold or claimed twice, and your certificate is your proof.

Ready to make a real impact?

Reduce aggressively and compensate immediately. Waiting a decade to take responsibility for today’s emissions is no longer a credible position, and your journey to transparent climate action is one click away.

Visit the marketplace →Talk to our team
Call +44 (0)1256 592599Browse the project directoryBuying from the UK?