Carbon Trade eXchange (CTX) has run a spot market for voluntary carbon credits since 2008. Corporate buyers, project developers and brokers use it to buy, sell and retire certified credits.
Wayne Sharpe founded CTX in 2008, after a year of research and development. It was the world's first digital exchange for spot trading voluntary carbon credits, and the first commercial partner to connect with the UN's Clean Development Mechanism (CDM) registry.
The idea has not changed since. A carbon market should be reliable, open and easy to reach, whatever the size of the business using it. Sellers list certified credits at their own price. Buyers pay cash and receive the credits the same day. Every trade settles through a direct link to the registry that holds them.
Our members include corporate buyers, project developers and brokers. They trade 24 hours a day, 365 days a year, in credits issued under recognised standards and registries, from Gold Standard and the UN CDM to BioCarbon, the Global Carbon Registry and the Universal Carbon Registry.
Registries and standardsThe spot market sits at the centre. Around it, CTX runs accounts, tools and registries for particular kinds of trader and sector.
The spot market. Buy certified credits for cash at the seller's listed price, settled into your registry account the same day.
How it worksAn invite-only account for institutional volumes, with no account fee and a flat US$0.10 per credit, per side.
About Corporate OneDirect, programmatic access to the marketplace for platforms, brokers and corporate buyers. Launched in August 2026.
About the APIRecords Internationally Transferred Mitigation Outcomes under Article 6 of the Paris Agreement, with a route forward for CDM projects.
About the ITMO RegistryA.C.E.® gives airlines and business aviation an offsetting route, including credits for CORSIA.
A.C.E. on ctxglobal.comA dedicated offsetting service for the maritime sector, run by CTX at shipcarbon.com.
Visit shipcarbon.comPartners, standards and registries we work with
The principles behind how we run the exchange.
Offsetting should be the last step, not the first. We ask companies to measure their footprint and cut what they can. When they offset what is left, they should use the most responsible credits available.
Sellers set their prices and buyers see them live. Trade data exports for your records, and our rules and fees are published for every member.
The exchange serves a small company offsetting a single event and an institution trading at volume, in the same marketplace.
Credits come from certified projects and move through direct registry links, so you always know where yours are held and when they were retired.
Wayne Sharpe founds Carbon Trade eXchange, after research and development that began in 2007 at STOP (Stop Trashing Our Planet).
CTX launches in London, working with Deutsche Bank, with registries linked through Markit.
CTX moves to Australia and relaunches in Sydney, with an electronic interface to Westpac.
Partnership agreements with Gold Standard and the American Carbon Registry.
CTX was granted an Australian Financial Services Licence in 2012, and opened an office in New York in 2014.
CTX builds the first commercial interface with the UNFCCC CDM Registry. The same year, the UNFCCC and CTX agree a way for businesses and individuals to buy and cancel UN-certified emission reductions through the exchange.
Built for transfers under Article 6 of the Paris Agreement, the ITMO Registry launches at COP25 in Madrid.
CTX connects to the BioCarbon Registry and the Universal Carbon Registry. Around 150 new members sign up, and the team grows from 6 to 20.
CTX India launches under a sub-licence at COP28 in Dubai, an office opens in South Africa, and membership passes 600.
The Global Carbon Registry launches, and CTX runs a Gold Standard ITMO spot auction for credits from a clean cooking programme in Malawi.
Trading on CTX passes one billion tonnes of CO₂e. The CTX API launches in August and Corporate One in September, and Minviro joins as our life-cycle assessment partner.
The team leading trading, technology, sales and operations at CTX.
Founded CTX in 2008. His work centres on electronic exchanges that use the internet's reach to connect buyers and sellers.
Leads technology and operations as Chief Technology Officer and Chief Operating Officer.
Runs international trading support for clients and brings new members on board as buyers, sellers or brokers.
Leads and develops CTX's global sales team.
Joined CTX in October 2021 as executive assistant to the founder.
Joined CTX as an office assistant in 2021 and rose quickly to manage the UK office.
Our sales team works from London. Operations and technology run from the Gold Coast in Queensland, Australia.
Whichever office you reach, the exchange itself is online and open 24 hours a day, 365 days a year.
Get in touch
Get started
Open an account online, or talk to our team about buying credits, listing a project or Corporate One.