What Is Slippage?

IntermediateOct 28, 2026 · 4 min read

Slippage is the difference between the price you expected for a trade and the price you actually got when it filled. Slippage is execution drift.

Definition

Slippage is the difference between the price you expected for a trade and the price you actually got when it filled.

In plain English:

Slippage is execution drift. You planned one price. The fill landed somewhere else.

It can be negative (worse than expected) or, less often, positive (better than expected). Traders care because repeated drift quietly eats edge — especially on size, thin markets, and fast moves.

In Trading

The real trading question

Knowing that fill price can differ from quote is only the start. The useful question is:

Is this clip small enough for this book or pool, at this moment, with a tolerance I can live with?

Shared amplifiers: volatility between quote and fill, thin liquidity, size versus depth, and delay — especially a pending on-chain confirmation while the market keeps moving.

Worked example: order-book walk

Suppose the best ask shows 100.00, and you market-buy 10 units into this thin ask ladder:

Level	Size	Price
1	2	100.00
2	3	100.40
3	5	101.00

Fill path: 2 @ 100.00 + 3 @ 100.40 + 5 @ 101.00.

Average fill ≈ 100.62, not 100.00.

That ~0.62% gap is slippage from walking depth. The top-of-book quote was real. Your size was simply larger than the top.

Same idea on a deep major book: the walk may be a few basis points. Same size on a thin alt book can be ugly fast. Size is relative to depth, not absolute dollars alone.

Worked example: AMM curve move

Constant-product pools move price as balances change. Simplified pool: 1,000 TOKEN and 100,000 USDC. Spot ≈ 100 USDC per TOKEN.

Buy a small clip that removes ~1 TOKEN: effective price barely lifts above 100.
Buy a much larger clip that removes ~50 TOKEN: the pool must rebalance harder; average buy price can jump several percent above the pre-trade spot.

Interfaces often label that movement price impact. It is one of the main ways AMM swaps create slippage on the ticket. The practical read is blunt: if quoted impact is already 3–8% before you sign, cutting size usually beats “accepting” it with a looser tolerance.

Two short trading scenes

Scene A — thin long-tail pool.

You want a new token. The pool is shallow. Quote shows several percent impact. Raising max slippage from 1% to 8% may make the swap land, but you are authorizing a much worse fill — and on public mempool routes that looser band can leave more room for sandwich-style extraction around your trade. Better first moves: shrink the clip, split, or skip.

Scene B — deep stable or major flow.

You rotate size in a deep stable/major market. Expected impact is tiny. A tight tolerance (for example low tenths of a percent) can be rational. If it keeps failing only because of noise, nudge tolerance slightly — do not jump to a wide band that turns a routine fill into an open-ended chase.

Slippage tolerance is a tradeoff, not a fee setting

Max slippage / slippage tolerance = the worst price move you will still accept.

Setting	What you buy	What you risk
Too tight	Stronger price protection	More failed swaps; possible wasted gas
Too loose	Higher chance the trade lands	Worse fills; more extractable room on some DEX routes

There is no universal correct percentage. Deep majors/stables can often stay tight. Thin or brand-new pools need either more room or, better, less size. If the quote already looks bad, change the trade design before you change the tolerance.

Design moves that change the fill

Read size against depth. A clip that is tiny on a major CEX book can be large inside a shallow pool.
Split when needed. Several smaller fills often move the book or curve less than one lump.
Prefer deeper routes when the asset allows it. Aggregators and deeper pools exist to reduce impact.
Use limit-style control when available. A limit does not invent liquidity; it stops blind chasing.
Budget the full stack. Slippage sits beside fees and gas. Cheap fees with ugly impact can still be expensive all-in.

For wallet-first trading on venues like edgeX, the habit is concrete: check quoted impact, set a max slippage you understand, and cut size when the market is thin — before you sign.

Don’t Confuse With

Slippage ≠ spread. Spread is the gap between best bid and best ask at a moment. Slippage is how far your actual fill drifts from the price you expected, often after walking depth or moving a pool.
Slippage ≠ trading fee. A fee is an explicit charge. Slippage is fill-price drift. You can pay both.
Slippage ≠ gas. Gas is network execution cost. A failed swap can still burn gas without giving you the fill you wanted.
Slippage ≠ price impact as a synonym dump. Price impact is how much your own order moves the market or pool. That movement is a major cause of slippage on AMMs; traders still use “slippage” for the expected-vs-executed gap on the ticket.
Slippage tolerance ≠ guaranteed good price. Tolerance only caps how bad a fill you will accept before the trade fails. It does not make a thin market deep.

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Disclaimer

This content is for educational purposes only and does not constitute investment advice. Trading digital assets and derivatives involves risk. Make sure you understand the products and consider your own circumstances before trading.

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