For buyers
Buy certified carbon credits, delivered the same day.
See every seller's asking price before you commit. Pay from your funded account, and the credits reach your registry account on the day you trade, ready to retire.
See every seller's asking price before you commit. Pay from your funded account, and the credits reach your registry account on the day you trade, ready to retire.
Some members offset a whole company's footprint. Others cover one event or one product, or buy on behalf of clients. The exchange works the same way for all of them.
Measure your emissions, cut what you can, then retire credits against what remains. That order matters, and our net-zero guide explains why.
Journey to net zeroCover the emissions from a conference, a product line or a service, and retire credits against that one claim rather than your whole organisation.
Buy on behalf of clients, or hold credits in your registry account and sell them on through the exchange later. Nothing forces you to retire straight away.
Large corporate buyers and offtake brokers can trade through Corporate One, an invite-only account with a single flat fee per credit.
CTX Corporate OneThe CTX API lets your software read live listings and buy credits directly, for example to offer customers an offset at checkout.
CTX APICTX runs sector programmes alongside the exchange: the Aviation Carbon Exchange (A.C.E.®) for aircraft operators, and Ship Carbon for the maritime industry.
Ship Carbon
Each credit on the exchange comes from a project certified under a recognised standard, and each one stands for one tonne of CO₂e. You see the seller's asking price before you buy, and that is the price you pay.
Trades settle through direct links to the registries, so you never carry the risk of a seller failing to deliver. CTX has run carbon markets since 2008, and the exchange runs on Microsoft Azure's SOC 2-audited cloud.
You only go through the first two once. After that, buying is a matter of funding your account and choosing a listing.
Apply online. There are two exchange account types: one for small companies and project developers, and one for large corporations and listed companies. Corporate One is by invitation.
Send photo ID and a bank statement less than three months old. Once you are approved, you receive a signed trading agreement and your access code.
Trades are paid for in cash from your exchange balance. With money in the account, you can buy the moment you find the right credits.
Choose a listing and buy at the seller's price, from 100 tonnes. The trade settles the same day, and the credits move to your registry account.
Retire the credits in the registry against your footprint, an event or a product. Or keep them in your account and sell them on through the exchange if your plans change.
Two listings can carry very different prices because the credits behind them are different. These details explain most of the gap, and they are worth noting for your own records.
The standard is the rulebook a project follows: how it measures the reduction or removal, and who checks the result. Under recognised standards, independent auditors validate the project and verify its results before any credits are issued. On CTX you will find credits from UNFCCC CDM, Gold Standard, Global Carbon Registry, BioCarbon and Universal Carbon Registry projects.
The registry gives each credit a unique serial number and records every transfer and retirement. That record is what stops one tonne being sold twice.
Some projects avoid or reduce emissions; others remove CO₂ from the air. Each type carries its own risks and its own benefits for local communities and nature.
Where a project sits shapes its co-benefits and the rules it works under. Under Article 6, the host government also decides whether its credits may be transferred abroad.
The vintage is the year the reduction or removal took place. Some schemes and claims guidance limit how old a credit can be, so check yours before you buy.
Corporate One is an invite-only account for corporate buyers, offtake brokers and large project developers. Costs stay predictable however large the order.
The Carbon Buyers Club is a simpler CTX account for SMEs and small brokers, and for larger companies that want to try the market before committing. You can buy from 10 tonnes, pay by card, and skip setting up a registry account, because retirement is handled for you.
There is a one-off US$50 account fee.
About the Carbon Buyers Club →
Sellers set their own prices, not CTX, and prices move with the market. They vary with the project type, the standard, the host country and the vintage. You see the asking price on every listing before you buy, and you pay that price plus CTX's commission and any registry fees.
The minimum trade on the exchange is 100 tonnes, which is 100 credits. If you need less, the Carbon Buyers Club lets you buy from 10 tonnes.
Credits bought on the exchange are delivered to your account at the registry that issued them, so in most cases yes. If you are not sure which account you need, ask our operations team at operations@ctxexchange.com. Carbon Buyers Club members do not need a registry account.
When you retire a credit, the registry cancels it permanently and records the retirement against its serial number, so it can never be sold or claimed again. Your CTX trade data and reports can be exported to sit alongside that record in your own reporting.
Yes, as long as you have not retired them. Credits you hold in your registry account can be listed and sold on through the exchange.
Verra VCS credits are available through CTX. Ask the trading desk at trading@ctxexchange.com about current supply and how a purchase would work for you.
Exchange members pay an annual membership, which depends on the account type, plus a commission on trades. The full schedule is in the CTX Fee Structure, and the CTX Rules set out how trading works. Corporate One accounts pay no account fee and US$0.10 per credit on each side.
Start buying
Apply online, pass our checks and fund your account. Or talk to the trading desk first about volumes, standards and what is listed today.