This is the 10383rd most frequent Russian word.
валютно
"Валютно" means "pertaining to currency or foreign exchange."
In this sentence, 'валютной' refers to something related to currency or foreign exchange, specifically describing the nature of the market.
На валютной бирже сегодня наблюдается рост активности.
Today, there is increased activity observed on the foreign exchange market.
Here, 'валютные' describes the courses or rates as being related to foreign currency, namely exchange rates.
Этот банк предоставляет выгодные валютные курсы.
This bank provides favorable exchange rates.
In this context, 'валютные' modifies the checks, indicating they deal with foreign or international currency.