Depending on whether you’ll be trading cash equities (physical stocks) or stock CFDs (derivatives not available to U.S. residents), you may need to set up a CDP Securities account with the Singapore Exchange (SGX). This involves connecting your local bank account for direct crediting services, and requires a Tax Identification Number (TIN), Singaporean Bank account number, and copy of your signature. In other words, if you are just trading CFDs on the SGX, you wont need a CDP, but if you are trading SGX products directly with your broker, the CDP account application will likely be required, and can be easily setup including using Singpass (learn more about setting up a CDP here: https://investors.sgx.com).