CurrencyPair consist of two fields: fromCurrency and toCurrency.
CurrencyPair should have crypto and fiat currency.
Currency dictionary:
| Currency name | Currency type | Currency scale |
|---|---|---|
| BTC | Crypto | 8 |
| ETH | Crypto | 8 |
| USDT | Crypto | 2 |
| BYN | Fiat | 2 |
| USD | Fiat | 2 |
| RUB | Fiat | 2 |