Climate finance transparency can help governments to reach a better understanding of the needs, gaps and opportunities in climate finance in their country. This allows them to attract and direct investments from national and international financial institutions and donors towards their country’s climate priorities. Article 6 of the Paris Agreement, which sets out the basic rules for international carbon markets and non-market approaches, represents a significant opportunity for countries, but it must be supported by adequate transparency. The ICAT toolbox offers guidance and tools to support countries in these efforts.