Notes on slippage in quiet and busy order books
Slippage is the difference between the price you expected and the average price you actually received. It depends on how much liquidity sits near the current price, and that changes through the day. In quiet hours, the book may be thin, with wide gaps between levels, so even a modest market order walks through several prices. In busy periods, the book is usually deeper, but prices can move quickly around news and large orders. This guide offers practical notes on observing and recording slippage on Binance, OKX, Bybit and Bitget, so that you can understand your own fills instead of guessing. It quotes no fees and makes no predictions about prices.
Look at the book before ordering
Before placing a market order, open the order book depth for the pair and look at how much quantity is available at the best few levels. Compare that with the size you intend to trade. If your order would consume several levels, expect slippage, and consider a limit order or splitting the order. Note also the gap between the best bid and best ask, because a wide spread is often a sign of a thin book.
Record expected and actual prices
For each trade you want to study, write down the time, pair, size, the price you saw before submitting and the average fill price afterwards. The difference, expressed as a percentage, is your slippage. Add a short note on market conditions, such as quiet weekend hours or a period around a scheduled announcement. After a few weeks, patterns appear that are specific to the pairs and sizes you actually trade.
Quiet periods
Thin books in quiet hours mean fewer orders near the price. A market order can therefore fill at noticeably worse levels, especially on smaller pairs. Limit orders give you control over the worst price you accept, at the cost of possibly not filling. If you regularly trade in quiet hours, your log will show whether smaller order sizes or patient limits would have served you better.
Busy periods
Busy periods often bring deeper books, but also rapid price moves. The price you saw a second ago may be gone by the time your order arrives. Avoid placing large market orders in the moments around major announcements, and consider protective limit prices. Compare the entries in your log from busy and quiet periods to see which conditions actually cost you more, rather than relying on general assumptions.
Risk boundary: BTC Pulse
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Scenario checkpoint
- Check order book depth against your order size before trading
- Record the expected price and average fill price for each studied trade
- Note whether the trade happened in a quiet or busy period
- Use limit orders to cap the worst price you accept
- Review your slippage log after a few weeks to find patterns