This document discusses downstream climate services provided by Copernicus Climate Change Services (C3S). C3S aims to support the climate services market and complement national climate service providers. It does this by providing climate information to both public and private stakeholders for adaptation initiatives and disaster risk management. The climate services market includes activities like vulnerability assessment, adaptation strategies, actions, and solutions. The size of the adaptation services market is estimated to be between 0.6-3.9 billion euros annually, while the overall climate services market is between 6.3-16.2 billion euros. C3S can help support this market by providing a public API for climate data and an API catalogue to help connect data providers and users.