CTX is a digital spot exchange for voluntary carbon credits. Members trade certified credits around the clock, and every trade settles the same day through direct links to the registries.
Working with partners and registries across the carbon market
Buyers need to know the credit is real and will arrive. Sellers need to know they will be paid. The exchange is designed around both.
CTX connects directly to the registries, so credits and sale proceeds move together. Every trade settles the same day (T+0), and delivery of the credits and payment to the seller are both guaranteed.
Buy, sell and retire from a single account, at prices sellers list in the open.
Live market pricing, with trade data and reports you can export for your own records and audits.
A global, low-cost market that trades 24 hours a day, 365 days a year, across every time zone.
CTX was the world's first digital exchange for spot trading voluntary carbon credits, and the first commercial partner to connect with the UN's CDM registry.
The same four steps whether you are buying 100 tonnes or listing a whole project.
Open an account online as a company or a project developer. Large corporates and listed companies have their own account type.
Send photo ID and a bank statement from the last three months. Once you're approved, you receive a signed trading agreement and your access code.
Sellers list credits at their own price. Buyers fund their account and buy instantly. The minimum trade is 100 tonnes.
Credits reach your registry account the same day. Retire them against your footprint, or hold them and sell them on.
Whether you trade a few hundred tonnes a year or move institutional volumes, there is an account built for it.
The eXchange
Members buy certified credits for cash at the listed price, with same-day settlement into their registry account. Sellers reach a global pool of buyers from a single listing.
Corporate One
An invite-only account for large project developers, corporate buyers and offtake brokers. There is no account fee and one flat fee per credit, so costs stay predictable at scale.
CTX API
The CTX API gives your software direct, programmatic access to the CTX marketplace, so you can build carbon credit buying into your own product or workflow.
ITMO Registry
Launched at COP25 in 2019, the ITMO Registry records Internationally Transferred Mitigation Outcomes under Article 6 of the Paris Agreement, and gives CDM projects a route forward as the old mechanism winds down.
Some emissions can't be engineered out yet. For those sectors, CTX runs dedicated programmes alongside the main exchange.
A.C.E.® gives operators an offsetting route built around how aviation reports emissions, including credits for CORSIA.
A dedicated offsetting service for the maritime sector, run by CTX at shipcarbon.com.
Measure your footprint, cut what you can, then offset what remains. Our life-cycle assessment partner Minviro helps with the measuring.
Credits on CTX come from projects certified under recognised standards, and every trade is delivered through a direct registry link. You always know which registry holds your credits, and when they were retired.
The exchange runs on Microsoft Azure's SOC 2-audited cloud, and our trading rules and fees are published for every member to read.
How we protect integrity →Offsetting should be the last step, not the first. Reduce what you can, then offset what remains with the most responsible credits available.
Whether you are offsetting a single event or a global footprint, buy from listed projects at open prices and retire straight from your registry account.
List your project's credits once and sell to a global pool of corporate and institutional buyers, with payment guaranteed on every trade.
Press release
A flat-fee, invite-only account for large project developers, corporate buyers and offtake brokers.
Partnership
Life-cycle assessment from Minviro, linked to trading on the exchange.
Press release
Programmatic access to the global carbon credit market for platforms and integrators.
A carbon credit represents one tonne of CO₂e reduced or removed by a certified project. A registry issues it with a unique serial number, and once it has been retired against an emission it can never be sold again.
Companies and project developers can apply online. For our checks you will need photo ID and a bank statement from the last three months. Large corporates and listed companies have their own account type, and Corporate One is available by invitation for institutional volumes.
The same day. CTX connects directly to the registries, so credits move to the buyer and proceeds move to the seller on T+0, with no counterparty or non-delivery risk.
100 tonnes, which is 100 credits. Corporate One accounts are designed for much larger volumes.
Sellers set their own asking prices, and buyers see them live on the exchange. Prices vary with the project type, the standard, the host country and the credit's vintage.
Exchange members pay an annual membership plus a commission on trades. Corporate One accounts pay no account fee and a flat US$0.10 per credit on each side. The full schedule is set out in our published rules and fees.
Get started
Open an account online, or talk to our team about volumes, project listings and Corporate One.