The documents every member trades under, plain-English guides to how carbon credits work, a glossary of the terms you will meet, and where to follow CTX news.
Members
The rules set out how membership, listing, trading and settlement work on the exchange. The fee structure sets out what each account type pays. Read both before you apply, so you know how the market runs and what it will cost you.
Guides on this site explain the market and how CTX works. Member documents and news are published on ctxglobal.com.
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One tonne, one serial number, one owner: what a credit represents, how it is issued and what retiring it means.
Measure your emissions, reduce what you can, then offset what remains. Why the order matters, and where credits fit.
What to check before you buy, from the standard and registry to the project type, host country and vintage.
Account types, joining, listing, buying, same-day settlement and retirement, explained step by step.
Where listed credits are issued and held, and how CTX's direct registry links make same-day settlement possible.
Article 6 transfers between countries, what an ITMO is, and the route forward for CDM projects and credit holders.
Short answers on accounts, trading, settlement, retirement and fees.
CTX's explainer on Internationally Transferred Mitigation Outcomes, and how Article 6.2 differs from Article 6.4.
The rules every member of the exchange trades under, covering membership, listing, trading and settlement.
Annual membership by account type, commission on trades and other charges for exchange members.
Account rules, how CDM credits are moved across and reissued, issuance parameters and links to the exchange.
The published charges for accounts and operations in the ITMO Registry.
Product launches, partnerships and market commentary from CTX, gathered on this site.
CTX's official announcements, including the launches of Corporate One and the CTX API.
Past issues of the CTX newsletter: member updates, new project listings and market commentary, back to 2023.
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Carbon markets come with their own vocabulary. These are the words used most across this site and in the CTX Rules, in plain English.
A tradable certificate for one tonne of CO₂e that a project has reduced, avoided or removed. A registry issues it under a standard, once the result has been independently verified.
Tonnes of carbon dioxide equivalent. It expresses other greenhouse gases, such as methane and nitrous oxide, as the amount of CO₂ that would cause the same warming over a set period, usually 100 years.
Cancelling a credit in its registry for good, so that nobody can sell or use it again. Retirement is the step that lets you count a credit against your own emissions.
The year in which the reduction or removal behind a credit took place. It is not the year the credit was issued or bought.
The database that issues credits with unique serial numbers and records who holds them, every transfer and every retirement. It is what stops the same tonne being counted twice.
The rulebook a project is certified against. It sets the methods for measuring reductions or removals and requires independent checks. Gold Standard and Verra's VCS are two examples.
A market where assets change hands for immediate delivery and payment at the current price, rather than on a set date in the future.
Short for "trade date plus zero days": settlement on the day of the trade itself. Credits and cash change hands the same day.
An Internationally Transferred Mitigation Outcome: a reduction or removal transferred between countries under Article 6 and counted towards the buying country's climate target. The host country makes a corresponding adjustment so the tonne is not claimed twice.
The part of the Paris Agreement that lets countries cooperate to meet their national climate targets. Article 6.2 covers transfers agreed between countries; Article 6.4 sets up a crediting mechanism supervised by the UN. Its core rules were agreed at COP26 in 2021, with further detail settled at later COPs.
The Clean Development Mechanism, set up under the Kyoto Protocol. It let projects in developing countries earn Certified Emission Reductions (CERs), each worth one tonne of CO₂e. The Article 6.4 mechanism is taking over its role.
The Carbon Offsetting and Reduction Scheme for International Aviation, adopted by the UN's International Civil Aviation Organization in 2016. Airlines offset growth in international flight emissions above a baseline, using eligible units.
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