Rates are automatically calculated as Exchange Rate x 0.95 (for USDT to RUB) and Exchange Rate × 1.03 (for RUB to USDT) with 0.1 rounding in our favor.
When you enter 1 USDT → VND rate, the reverse rate (1M VND → USDT) is auto-calculated as 1 000 000 / (rate + spread). You can still edit the result manually.