What Is Spread?

IntermediateNov 2, 2026 · 5 min read

Spread is the gap between the best bid and the best ask on an order book. Spread is the extra cost of getting filled right now.

Definition

Spread is the gap between the best bid and the best ask on an order book.

Trader feeling first:

Spread is the extra cost of getting filled right now. Market buy → you pay the ask. Market sell → you hit the bid. That gap is the spread.

Live scene: SOL/USDT, market buy $5,000

You open SOL/USDT on a CEX Spot book (Binance / OKX / Bybit / Coinbase-style) or a wallet-first order-book DEX ladder. The chart last / mid looks “about 148.35.” At the top of the book you actually see:

Side	Price	Size at touch (illustrative)
Best bid	148.20	enough for a small sell
Best ask	148.50	enough for a modest buy

Absolute spread = 148.50 − 148.20 = 0.30 USDT.

Mid ≈ 148.35.

% spread ≈ 0.30 / 148.35 ≈ 0.20%.

You click Market Buy for about $5,000 USDT.

You do not get filled at the pretty mid 148.35.
You pay near the ask: about 148.50.
Rough SOL received ≈ 5,000 / 148.50 ≈ 33.67 SOL.
If the mid had been “free”: 5,000 / 148.35 ≈ 33.70 SOL.
Difference ≈ 0.03 SOL — about $4–5 on this clip — paid just to fill now, before fees and before any deeper ladder walk.

That is the aha:

“Oh — that’s spread.” The chart mid is a reference. Your market buy buys the ask. The bid–ask gap is the immediacy tax.

Same book, sell-now feel: a market sell would hit 148.20, not 148.35. Round-trip ignore fees: buy ask / sell bid and you already gave away the full 0.30 gap.

Absolute spread = ask − bid.

% spread ≈ (ask − bid) / mid × 100.

You feel this before deeper walk or pool impact shows up as slippage. On a thin book, $5,000 can also walk past the top ask — that extra walk is slippage / depth, not the definition of spread. A wide quoted spread can still kill the ticket by itself.

If the screen is a pure AMM “SOL → USDT → Quote,” you are usually reading a pool quote, not a classic bid–ask → What Is an AMM?.

In Trading

Labels on the screen

You may see	Trader read
Bid / Best bid	Best price someone will pay you if you sell now
Ask / Offer / Best ask	Best price you pay if you buy now
Spread or ask−bid	The cash gap between those two
Spread %	That gap as a percent of mid

Some UIs print the gap. Others make you subtract. Same job either way.

Buy now vs wait (the real decision)

If you…	What happens to the spread
Take / market / “buy now” / “sell now”	You cross the spread — you pay for speed
Rest a limit inside or at the book	You try to avoid paying the full gap (may wait; may not fill)

Practical filter:

Do I need this fill now badly enough to pay this bid–ask gap on this size?

If no → limit, wait, shrink, or skip.

Do not hope a looser slippage setting will fix a touch that is already too expensive.

Tight book vs wide book (two live scenes)

Scene A — major, tight (like the SOL/USDT $5,000 buy).

Spread at the touch is small in % terms. Paying it for a modest clip can be fine. Next check is whether $5,000 still fits at the top ask or starts walking → What Is Liquidity? and What Is Slippage?.

Scene B — thin alt, wide.

Best bid 0.0120, best ask 0.0140. Mid 0.0130. Spread ≈ 15%.

A “quick buy” at the ask already eats a huge chunk of edge before any deeper walk.

Call: wait, careful limit, cut size hard, or skip. Do not treat the chart mid as your entry.

What makes the gap widen (short)

Few resting orders near the top
Fast markets — makers pull or step back
News / listing chaos / dead hours
Thin pairs with little maker competition

Full depth essay → What Is Liquidity?. Full ladder anatomy → What Is an Order Book?.

Quoted gap first

Quoted spread = what the top of the book shows right now (ask − bid or %).

Later fill quality can still worsen if size walks the ladder or timing slips — that is mostly slippage / fees.

Habit: if the quoted gap already kills the ticket, stop. Only then worry about walk and tolerance.

Judgment loop

What are the best bid and best ask on this pair?
What is the gap in cash and in %?
If I take now, is that extra cost still OK for this size?
Do I need now, or can a limit / wait work?
Is this a thin / jumpy book that may widen further?
If the gap already kills the trade, do not click take.

Can / cannot

Can

Treat the top gap as the price of filling now
Compare pairs / venues by absolute and % spread
Choose take vs rest on purpose
Kill dead tickets when the touch is already too wide

Cannot

Expect the mid to be your fill
Assume tight spread = deep book
Swap the word “spread” for “slippage”
Ignore venue fees / funding as separate cost lines

If you later trade on edgeX, read bid, ask, and any spread % on the live book before you take liquidity.

Don’t Confuse With

Spread ≠ slippage. Spread = bid–ask gap at the touch. Slippage = expected vs actual fill drift → What Is Slippage?
Spread ≠ liquidity. Liquidity = how much size sits near the touch → What Is Liquidity?
Spread ≠ the order book. The book is the ladder; spread is one top measurement → What Is an Order Book?
Spread ≠ trading fees. Fees are venue charges; spread is the bid–ask gap
Spread ≠ funding / basis (perps). Different cost stories — not this spot gap
Spread ≠ AMM pool quote. Pool screens often have no classic bid–ask → What Is an AMM?
Spread ≠ trading pair. Pair names the market → What Is a Trading Pair?

Ready for the next step?

Continue to registration or trading from this page using the official links.

Start trading on edgeX

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.

Glossary

What Is Spread?

IntermediateNov 2, 2026 · 5 min read

Spread is the gap between the best bid and the best ask on an order book. Spread is the extra cost of getting filled right now.

Definition

Spread is the gap between the best bid and the best ask on an order book.

Trader feeling first:

Spread is the extra cost of getting filled right now. Market buy → you pay the ask. Market sell → you hit the bid. That gap is the spread.

Live scene: SOL/USDT, market buy $5,000

Side	Price	Size at touch (illustrative)
Best bid	148.20	enough for a small sell
Best ask	148.50	enough for a modest buy

Absolute spread = 148.50 − 148.20 = 0.30 USDT.

Mid ≈ 148.35.

% spread ≈ 0.30 / 148.35 ≈ 0.20%.

You click Market Buy for about $5,000 USDT.

You do not get filled at the pretty mid 148.35.
You pay near the ask: about 148.50.
Rough SOL received ≈ 5,000 / 148.50 ≈ 33.67 SOL.
If the mid had been “free”: 5,000 / 148.35 ≈ 33.70 SOL.
Difference ≈ 0.03 SOL — about $4–5 on this clip — paid just to fill now, before fees and before any deeper ladder walk.

That is the aha:

“Oh — that’s spread.” The chart mid is a reference. Your market buy buys the ask. The bid–ask gap is the immediacy tax.

Same book, sell-now feel: a market sell would hit 148.20, not 148.35. Round-trip ignore fees: buy ask / sell bid and you already gave away the full 0.30 gap.

Absolute spread = ask − bid.

% spread ≈ (ask − bid) / mid × 100.

If the screen is a pure AMM “SOL → USDT → Quote,” you are usually reading a pool quote, not a classic bid–ask → What Is an AMM?.

In Trading

Labels on the screen

You may see	Trader read
Bid / Best bid	Best price someone will pay you if you sell now
Ask / Offer / Best ask	Best price you pay if you buy now
Spread or ask−bid	The cash gap between those two
Spread %	That gap as a percent of mid

Some UIs print the gap. Others make you subtract. Same job either way.

Buy now vs wait (the real decision)

If you…	What happens to the spread
Take / market / “buy now” / “sell now”	You cross the spread — you pay for speed
Rest a limit inside or at the book	You try to avoid paying the full gap (may wait; may not fill)

Practical filter:

Do I need this fill now badly enough to pay this bid–ask gap on this size?

If no → limit, wait, shrink, or skip.

Do not hope a looser slippage setting will fix a touch that is already too expensive.

Tight book vs wide book (two live scenes)

Scene A — major, tight (like the SOL/USDT $5,000 buy).

Scene B — thin alt, wide.

Best bid 0.0120, best ask 0.0140. Mid 0.0130. Spread ≈ 15%.

A “quick buy” at the ask already eats a huge chunk of edge before any deeper walk.

Call: wait, careful limit, cut size hard, or skip. Do not treat the chart mid as your entry.

What makes the gap widen (short)

Few resting orders near the top
Fast markets — makers pull or step back
News / listing chaos / dead hours
Thin pairs with little maker competition

Full depth essay → What Is Liquidity?. Full ladder anatomy → What Is an Order Book?.

Quoted gap first

Quoted spread = what the top of the book shows right now (ask − bid or %).

Later fill quality can still worsen if size walks the ladder or timing slips — that is mostly slippage / fees.

Habit: if the quoted gap already kills the ticket, stop. Only then worry about walk and tolerance.

Judgment loop

What are the best bid and best ask on this pair?
What is the gap in cash and in %?
If I take now, is that extra cost still OK for this size?
Do I need now, or can a limit / wait work?
Is this a thin / jumpy book that may widen further?
If the gap already kills the trade, do not click take.

Can / cannot

Can

Treat the top gap as the price of filling now
Compare pairs / venues by absolute and % spread
Choose take vs rest on purpose
Kill dead tickets when the touch is already too wide

Cannot

Expect the mid to be your fill
Assume tight spread = deep book
Swap the word “spread” for “slippage”
Ignore venue fees / funding as separate cost lines

If you later trade on edgeX, read bid, ask, and any spread % on the live book before you take liquidity.

Don’t Confuse With

Spread ≠ slippage. Spread = bid–ask gap at the touch. Slippage = expected vs actual fill drift → What Is Slippage?
Spread ≠ liquidity. Liquidity = how much size sits near the touch → What Is Liquidity?
Spread ≠ the order book. The book is the ladder; spread is one top measurement → What Is an Order Book?
Spread ≠ trading fees. Fees are venue charges; spread is the bid–ask gap
Spread ≠ funding / basis (perps). Different cost stories — not this spot gap
Spread ≠ AMM pool quote. Pool screens often have no classic bid–ask → What Is an AMM?
Spread ≠ trading pair. Pair names the market → What Is a Trading Pair?

Ready for the next step?

Continue to registration or trading from this page using the official links.

Start trading on edgeX

What Is Spread?

Definition

Live scene: SOL/USDT, market buy $5,000

In Trading

Labels on the screen

Buy now vs wait (the real decision)

Tight book vs wide book (two live scenes)

What makes the gap widen (short)

Quoted gap first

Judgment loop

Can / cannot

Don’t Confuse With

Share

Related articles

Ready for the next step?

Disclaimer

What Is Spread?

Definition

Live scene: SOL/USDT, market buy $5,000

In Trading

Labels on the screen

Buy now vs wait (the real decision)

Tight book vs wide book (two live scenes)

What makes the gap widen (short)

Quoted gap first

Judgment loop

Can / cannot

Don’t Confuse With

Share

Related articles

Ready for the next step?

Disclaimer