Under the Paris Agreement, the Measurement, Reporting and Verification (MRV) requirements for greenhouse gas emissions of all countries will be harmonised. Sector-wide MRV systems developed for Nationally Appropriate Mitigation Actions (NAMAs), such as in the NAMA Readiness Programmes established under the Nordic Partnership Initiative in Vietnam and Peru, can provide important lessons learned for the development of the new transparency rules. NAMAs can serve as concrete building blocks for future Nationally Determined Contributions (NDCs) under the Paris Agreement.