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Answer: Exchange fees are expressed as the difference (spread) between TTS and TTB. TTS is an abbreviation for "Telegraphic Transfer Selling rate", the rate at which banks sell foreign currency to customers (the rate at which customers buy), TTB is "Telegraphic Transfer Buying rate", which is the rate at which a bank buys foreign currency from customers (the rate at which customers sell). The mid price between TTS and TTB is the TTM (Telegraphic Transfer Middle rate), which is the reference rate for foreign exchange. The difference from this TTM rate is the bank's profit as a foreign exchange fee. TTS and TTB are presented daily for all currencies that can be exchanged. Currency fees with a high circulation volume are cheaper, and currencies with a low circulation volume are expensive.