Questions about trading on CTX.

One credit represents one tonne of CO₂e reduced, avoided or removed by a certified project. A registry issues it with a unique serial number, and once it is retired against an emission it can never be sold again. Our carbon credit explainer covers the detail.

Registered companies can join to buy, sell or both. There are two account types: one for small companies and project developers, and one for large corporations and listed companies. CTX Corporate One, for institutional volumes, is available by invitation.

Apply online, then send photo ID and a bank statement dated within the last three months so CTX can complete its identity checks. Once you are approved, you receive a countersigned trading agreement, a welcome letter and your access code. Questions about an application go to operations@ctxexchange.com.

CTX is an online spot exchange. Sellers list credits at their own price, buyers fund their account and buy instantly, and the credits move to the buyer's registry account the same day. From there you can retire them or sell them on. See how the exchange works.

At any time. The exchange is open 24 hours a day, 365 days a year, across every time zone.

CTX has two offices: London, United Kingdom, which runs sales, and Gold Coast, Australia, which runs operations and technology. Contact details are on our contact page.

Credits from projects certified under recognised standards, held in registries including the UNFCCC CDM Registry, Gold Standard, the Global Carbon Registry, BioCarbon and the Universal Carbon Registry. For Verra (VCS) credits, contact sales@ctxexchange.com and the team will source them through its network of buyers and sellers. See registries and standards.

Sellers set their own prices, and these can change daily. Prices differ by project type, standard and vintage. You pay the listed price plus CTX's transaction fee and any registry fees. For current prices, email trading@ctxexchange.com.

Yes. The minimum trade is 100 tonnes, which is 100 credits.

It depends on the registry. You can buy UN CDM credits for voluntary cancellation without a registry account of your own, while Gold Standard credits need a Gold Standard registry account. Corporate One members can buy to transfer or buy to retire without holding their own registry accounts. Ask trading@ctxexchange.com which applies to the credits you want.

The credits are delivered to your registry account the same day. You can retire them against your emissions, or hold them and sell them on later.

Yes. For bespoke purchases or OTC trades, fill in CTX's buyer request form and the team will be in touch.

Join as a member, complete the identity checks, then list your credits at the price you choose. Your credits are moved into a CTX account at their registry and held there until they sell, which is how delivery can be guaranteed on the day of the trade. The operations team sends you a quick-start trading guide when you join.

Give your Gold Standard registry account details when you apply, then email your KYC documents to operations@ctxexchange.com. Once CTX has checked them, you transfer the credits to CTX's Gold Standard account, where they are frozen for sale but remain yours. Then send Gold Standard the listing details: project, type, quantity, whether to sell all or part, price and currency. The credits appear on the exchange once that is processed.

Yes. You can change your price in one click at no extra cost, and delist credits at any time for a small administration charge.

The same day. Trades settle on T+0, and payment of the proceeds is guaranteed, so you carry no counterparty risk.

CTX has traded CDM credits as a commercial partner to the UNFCCC CDM Registry since 2017. As the CDM winds down, CTX offers routes for CDM credits and projects through its CDM Fire Exit and the ITMO Registry. These have fixed deadlines, so contact info@ctxexchange.com early. See the ITMO Registry page.

The same day (T+0). CTX connects directly to the registries, so credits move to the buyer and proceeds move to the seller together, with delivery guaranteed on both sides and no counterparty or non-delivery risk.

A registry is the system that issues credits, tracks who owns them, and records every transfer and retirement. Because it records ownership, the same credit cannot be counted twice.

Credits on CTX are held in registries including the UNFCCC CDM Registry, Gold Standard, the Global Carbon Registry, BioCarbon and the Universal Carbon Registry. The full list is on our registries and standards page.

Yes. The exchange shows live market pricing, and you can export trade data and reports for your own records, reporting and audits.

On Microsoft Azure's SOC 2-audited cloud.

Yes. Exchange members pay an annual membership fee, set by account type: one rate for small companies and project developers, and another for large corporations and listed companies. Renewal fees are lower than the first year. Current rates are in the CTX Fee Structure.

CTX charges a commission on each trade, on top of the listed price. Any registry fees are charged separately. The rates are set out in the CTX Fee Structure and the CTX Rules.

Yes. Corporate One accounts pay no account fee and a flat US$0.10 per credit on each side of a trade, whatever the credit's price.

An invite-only, flat-fee account for organisations trading at institutional scale: large international project developers, corporate buyers, offtake brokers and institutional trading desks. See CTX Corporate One.

Corporate One has no self-service sign-up. If your organisation trades at volume, email corporateone@ctxexchange.com.

No account-opening fee and no minimum balance, with a flat US$0.10 per credit per side. Trades settle on T+0, 24/7/365, with electronic clearing and no paperwork. Members can buy to transfer or buy to retire without their own registry accounts, and see live FX rates through Westpac.

An Internationally Transferred Mitigation Outcome: one tonne of CO₂e reduced or removed, authorised for transfer between countries under Article 6.2 of the Paris Agreement. Countries use ITMOs towards their national targets (NDCs). A corresponding adjustment in the host country's accounts makes sure the tonne is only counted once.

A registry launched at COP25 in 2019 for Article 6 transfers. It issues Global Carbon Credits (GCCs) from projects that pass a design review and independent monitoring, reporting and verification. A GCC can be classed as an ITMO once the host country approves the transfer with a letter of authorisation. See the ITMO Registry page.

Yes. Credits issued in the ITMO Registry can be traded on the exchange at the seller's price, which needs a CTX account. No ITMO Registry transfer fees are charged on credits sold through CTX, though CTX's own trading fees apply. Credits can also be traded over the counter through the registry itself.