Let's compare to TTS/TTS rates banks offering

When you want to make a deposit in foreign currencies at the bank, the TTS rate is applied for the exchange rate to buy the relevant foreign currency, while you can get Japanese Yen using the TTB rate when withdrawal. TTS/TTB rates are always shown at the counter in the bank. If the fixing rate for the day is 120.00 for a dollar, the TTS rate becomes 121.00 which is one big figure or one Yen higher than the fixing rate, and the TTB rate does 119.00 which is one big figure or one Yen lower. This spread between the TTS rate and the TTB rate gets 200 points or two Yen width in the end. Therefore, you should be happier to trade at the narrower spread, like 5 points or 10 in the forex margin trading.