Article 6.2 allows countries to cooperate directly on mitigation outcomes and transfer them internationally. That flexibility has made bilateral agreements one of the fastest-moving parts of the Paris Agreement carbon market architecture. It has also created a common source of confusion: a signed cooperation agreement is not the same thing as an authorised project, and an authorised project is not yet a transferred ITMO.
What an Article 6.2 agreement actually does
A bilateral or multilateral cooperation agreement establishes the legal and administrative basis for transfers between participating countries. It normally sets out eligible activity types, sustainability requirements, reporting responsibilities, authorisation procedures and the way corresponding adjustments will be applied.
The agreement is therefore an enabling layer. Project developers still need to satisfy the host country's project approval process, demonstrate alignment with its nationally determined contribution and meet the technical requirements of the acquiring country or programme.
Where the market is developing fastest
Switzerland has been one of the most active acquiring countries, using bilateral implementation agreements to support mitigation activities that can generate internationally transferred mitigation outcomes. Japan's Joint Crediting Mechanism has also built a wide network of partner-country arrangements, while Singapore has signed cooperation agreements designed to support the use of eligible international credits under its domestic carbon tax framework.
Other buyers are developing Article 6 demand through national compliance systems, airline obligations, procurement programmes and sovereign climate finance. Host countries are taking different approaches. Some maintain central positive lists of eligible technologies. Others invite project submissions and assess each activity against national priorities, sustainable development objectives and NDC accounting needs.
The bottleneck is implementation, not signatures
The headline number of agreements can overstate how much supply is close to market. A functioning transfer requires several layers to line up:
- A cooperation framework between countries.
- A host-country approval process with clear institutional authority.
- A project methodology and monitoring plan.
- Validation and verification by an accepted independent body.
- Host-country authorisation for a specific use.
- Tracking, first transfer and corresponding adjustment.
Many agreements are young, and the administrative systems needed to complete these steps are still being built. For buyers, the practical question is not simply whether two countries have signed. It is whether the activity has a credible route through authorisation, monitoring, transfer and use.
What corporate and sovereign buyers should verify
Before treating an Article 6 opportunity as deliverable supply, buyers should examine the exact status of the host approval, whether the intended use is covered by the authorisation, which registry or tracking system will record the transfer and how changes in national policy are allocated contractually.
Article 6.2 creates a powerful route for sovereign-grade carbon finance, but its integrity comes from the accounting and governance around the project, not the existence of an agreement alone. Sentinel Earth develops Article 6 activities with these approval and transfer requirements built into project design from the start. See our Article 6 project development approach and the Föhn refrigerant abatement programme.
