Slippage: The Fee Nobody Prints on the Pricing Page

What slippage is

Slippage is the difference between the price you expected and the price you actually got. It is not a fee any exchange prints on its pricing page, which is exactly why it catches people. You saw $100,000 on the ticker, pressed buy, and your average fill came back at $100,140. That $140 gap on a 1 BTC order is slippage.

It happens because a market order consumes the book level by level. The first slice fills at the best ask, the next slice at the next price up, and so on until your full size is done. The thinner the book, the faster the price climbs under you.

A worked example on two books

Say you market-buy $50,000 of BTC at a $100,000 ticker price. On Binance, with millions in the 0.1% band, your average fill might land at $100,010, about one basis point, or $5 of slippage. On a thin venue holding $60,000 in the same band, you exhaust the near book and average $100,350. That is $175 gone.

Now add fees. Binance takes 0.10% taker, or $50, for a total cost near $55. The thin venue could charge zero fees and still cost you three times more. This is the arithmetic that fee tables hide.

Market orders versus limit orders

A market order says fill me now at whatever the book offers. You get certainty of execution and you pay whatever slippage the book dictates. A limit order says fill me at this price or better. You cap your cost exactly, and in exchange you accept the risk of not being filled at all if the market runs.

There is a fee angle too. On most venues limit orders that rest on the book pay the maker rate, which is lower: Kraken charges 0.16% maker against 0.26% taker. On MEXC makers currently pay 0.00%. You get paid in fee savings for being patient.

How to cap slippage in practice

The bluntest tool is a limit order set a small distance through the touch, say 0.05% above the ask for a buy. You will usually fill immediately, and you have a hard ceiling on the price. Many venues also offer a slippage tolerance setting on market orders that cancels anything beyond your threshold.

For genuinely large tickets, split the order. Ten slices of $10,000 spaced over an hour let the book refill between fills. Past a certain size, roughly mid six figures on most books, an OTC desk quotes you one price and takes the execution problem away entirely.

Choosing the venue before choosing the tactic

Every tactic works better on a deep book. Our liquidity subscores exist to shortlist venues where slippage is a rounding error for ordinary sizes: Binance 9.9, Bybit 9.6, OKX 9.5, Coinbase 9.2 on USD pairs, Kraken 8.9. On venues we score below 7, assume market orders above a few thousand dollars carry real slippage.

As always, our numbers reflect the dataset date. Books breathe with the market, so for size, confirm depth on the venue before you commit.

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