Paper Trading Before Real Money
Paper trading proves your order mechanics and leaves psychology untested. See what simulator fills omit, how long to practice, and which metrics matter.
#trading costs
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How Much Does It Cost to Trade Options?
Options commissions may be zero, but the bid-ask spread is real. See the median cost to trade SPY, QQQ, IWM, GLD, and TSLA options, in basis points.
What It Costs to Trade a Stock, Measured
Commissions are zero, but every stock trade pays the bid-ask spread. See the real cost of trading stocks, measured in basis points across 12 household names.
Why Are Spreads Wider at the Open? Real Data
Why are spreads wider at the open? Tick-level quotes price the opening premium half hour by half hour, show how fast it fades, and what premarket really costs.
What Is a Bid-Ask Spread? Real Costs
Learn what a bid-ask spread is, how to calculate it, and what it costs per trade, with real spreads measured from tick-level quote data on US stocks.
How Do Market Makers Make Money? The Spread
What market makers do and how they earn the bid-ask spread, with real tick data: measured spreads, quote updates per second, and the SQL behind every number.