Interactive Brokers allows users to transfer $BTC, $ETH, and $SOL directly from external wallets into associated crypto accounts without having to sell first and then buy back, with commissions compressed to 0.12% to 0.18%. Once this type of gateway is smoothed out, funds remaining in the traditional brokerage system can more easily flow into crypto assets, which in the short term is a positive liquidity signal for $BTC, $ETH, and $SOL . $BTC is typically the first to be picked up by the market for trading.