The Delian League, a historic alliance led by Athens, stands as an enduring symbol of collaboration against common threats in ancient Greece. Fast forward to the 21st century, we bring together the founding and affiliate members of the Net-Zero Export Credit Agencies Alliance (NZECA) to discuss the alliance's goals and shed light on how these institutions plan to deliver net-zero economies by 2050 by supporting the decarbonisation of trade and facilitating joint action from public and private finance. We explore the implications of these commitments for exporters, banks and ECAs, and the mechanisms by which members will publish emissions data and adhere to climate portfolio alignment methodologies.