The blockchain network required for stablecoin deposits (USDT or USDC).
For e.g, if USDT is specified in the currency field and TON here, it signifies USDT on TON USDT-TON.
Allowed networks for USDT: TRX, ETH, MATIC, TON, BNB.
Allowed networks for USDC: SOL, ETH, MATIC, TRX, BNB.