How Near-Midprice Order Book Depth Affects Short-Term Slippage
Summary
The document explains why order-book depth close to the mid-price can matter to intraday and high-frequency strategies with small per-trade targets. It focuses on the amount of resting liquidity within five basis points of mid, arguing that thin near-price books can push marketable orders into worse prices and raise round-trip costs. A comparison of semiconductor perpetual markets reports greater five-basis-point depth on Bitget than on the next-best venue for four tickers.
A worked NVDA example compares the estimated slippage and cumulative costs for a $20,000 order under deeper and thinner book conditions, then scales the difference across repeated trades. The examples illustrate how execution costs can erase a strategy’s expected edge even when headline fees appear modest. The figures are venue-specific claims and simplified estimates; actual fills depend on order type, timing, volatility, queue position, and market impact. The article provides no independent data methodology or live strategy validation.
Key ideas
- Near-midprice depth helps determine how much a marketable order may move through the book.
- Repeated small slippage costs can materially affect a high-turnover strategy with thin expected returns.
- Comparing depth within a defined price band can reveal execution differences that fee schedules alone miss.
- The document’s venue and ticker figures are presented as examples and may not generalize across conditions.
- Realized slippage depends on order handling, market conditions, and the size of the trade relative to available liquidity.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.