The useful central comparison For cash, compare Đồng Khởi with the Nguyễn An Ninh–Bến Thành cluster. The shops are close enough to test the same notes before committing. Traveller discussions disagree on a permanent winner, especially when note denomination and condition change. Hung Long at 86 Mạc Thị Bưởi showed 4.1 from 817 Google reviews on 31 August 2026. Current reviews included smooth exchanges and competitive quotes. The repeated negative pattern was lower rates for small or creased bills, a calculator quote changing after cash was handed over, and no clear screen. Hà Tâm Jewelry at 2 Nguyễn An Ninh showed 3.7 from 1,043 reviews. It attracts heavy comparison traffic and some reviewers reported strong rates. Others described long queues, unavailable VND, tiered rates, rejected worn notes and rude service; one review alleged short-changing. Eximbank 59 at 135 Đồng Khởi showed 3.4 from 397 reviews. Some recent visitors found uncommon currencies or a better quote than Hung Long. Lower reviews repeatedly mentioned old-note discounts, poor rates, rude service and missing receipts; one recent reviewer alleged a 50,000-VND shortage. Use your actual banknotes Before surrendering cash, ask: “For these two $100 notes and four $20 notes, what exact VND total will I receive?” Make the cashier enter or write the final amount. Count every note yourself, compare it with the agreed total and request a receipt. Do not let a queue rush the count. Vietnamese rules permit foreign-currency exchange through authorised banks and licensed agents. A busy jewellery shop is not proof of authorisation, so check the displayed licence or use a bank counter. At the airport, exchange only the amount needed to reach the city if the quote is materially worse. USDT Vietnam's crypto market is under a regulated pilot, not a general licence for any street desk. Use only an operator whose current status and service can be verified. Do not hand cash to a runner or send USDT to a third-party wallet without the legal entity, payout and receipt.