Where to compare cash Bangkok's useful comparison zone runs from Ratchadamri and Pratunam to Phaya Thai. It gives you several established counters within a short BTS or walking trip. Sukhumvit is easier if you are staying there, but compare the final payout before travelling across town for a small exchange. Superrich Thailand at 45 Soi Ratchadamri 1 showed 4.2 from 822 Google reviews on 31 August 2026. Recent reviews praised the rate, while lower reviews repeatedly described 50–120 minute waits and different treatment of note denominations. It is a reference quote, not an automatic winner. Siam Exchange at 422/3 Phaya Thai Road showed 4.8 from 710 reviews. Many reviewers described fast service and competitive rates. The contrary pattern was rude service, rejection of worn notes and weak quotes for less common currencies. Vasu Exchange on Sukhumvit Road showed 4.5 from 465 reviews. Reviews often praised its speed and USD rates; low-rated reports repeatedly mentioned website-to-counter differences and reduced rates or rejection for old, marked or damaged notes. How to compare Take the exact notes you plan to sell to two or three nearby counters. Ask: “For these $100 notes, exactly how many baht will I receive?” A board may quote a different tier for $50, $20 or imperfect notes. Count the baht at the counter. Keep your passport with you: passport requirements appear repeatedly in reviews of all three offices. At Suvarnabhumi, traveller discussions distinguish the basement counters near the Airport Rail Link from the convenience desks in arrivals. If you cannot compare, change only enough for transport, then check city quotes. Thailand's central bank publishes a list of authorised money changers, so verify the legal entity rather than relying on a familiar sign colour. USDT For crypto, check the exact operator in the Thai SEC's licensed digital-asset register. A Maps pin, Telegram contact or physical desk is not a licence. Before any transfer, get the THB payout, wallet owner, network, identity checks and receipt in writing; do not send to a personal or unrelated wallet.