Or something to that effect since they may be buying fixed amounts in RUB or other major currencies, which will slightly affect your wording. There is no point in merely translating words here because this is not how it is actually said in English. Unless, that is, you want it to sound like you are translating words. The process is not called "bidding," it's called trading and that's all you really need to say. There's no need to say "organized" or "formal," or "regulated" because all currency trading is organized, formal and regulated - unless, that is, you are changing your money on the street in some third world paradise:) There's no need to say "on-exchange" because you mention the Moscow Exchange, and that in itself tells the readers what they need to know about the trading venue. If they were NOT trading on an exchange, they would say they were "trading over-the-counter" or "on the OTC market".

You also want to check the time stamp on your article because this currency trading platform in Moscow was known as MICEX before it merged with something else in 2011 and became what is known as the Moscow Exchange today.