This report was prepared by Thomas Boltshauser and Jean-Marc Seigneur as an input to the work of the Architecture Working Group (AIRU WG) on the standardization and interoperability of stablecoins based on the 8 stablecoins use-cases submitted and presented to the AIRU WG over 2020 and 2021. The authors would like to thank Mrs. Lisa JY Tan, Mrs. Suzana Maranhão Moreno, Mr. Vijay Mauree, Mr. Vipin Bharathan, Mr. Jorick Lartigau, and Mr. Ezechiel Copic for their valuable insights and contributions. The report is submitted for consideration to the AIRU WG.