Quote from EpiphanyTrading:
How is SwiftTrade? What is their pricing model?
execution fee $0.119 per order
For US markets:
clearing fee $0.065 per 1000 shares capped at $0.28 per fill
SEC fee $0.0000153 * share * price (or 0.0000153 x aggregate price of sell order)
Activity fee $0.0000307 * share * price (or 0.0000307 x aggregate price of sell order)
+ECN costs/rebates