7 min read The bid-ask spread is the gap between the price you can sell at (the bid) and the price you can buy at (the ask). Every market has one, and it’s the first cost of every trade. But it doesn’t behave the same way in forex, crypto, and stocks. Where it’s tightest, and what moves it, comes down to one thing: liquidity.
The same idea, three different markets
The spread itself is simple everywhere: subtract the bid from the ask, and that gap is what you pay to cross the market. Buy at the ask, and you could only sell back at the lower bid, so every position starts slightly down. What changes from market to market is how the spread is quoted, how wide it runs, and what makes it move. For the underlying mechanics, the spread in trading guide is the place to start.
| Forex | Crypto | Stocks | |
|---|---|---|---|
| Quoted in | Pips | Price or % | Cents per share or % |
| Typical tightness | Tightest | Widest, most variable | Tight on large-caps, wide on small |
| Main driver | Pair liquidity | Coin and venue liquidity | Company size and volume |
| Hours | 24/5 | 24/7 | Exchange hours |
| Structure | Deep global interbank | Fragmented exchanges | Centralised exchange / NBBO |
Forex: the tightest spreads anywhere
Forex sets the benchmark. As the largest, most liquid market in the world, it produces the narrowest bid-ask spreads, quoted in pips. A major pair like EUR/USD or USD/JPY can trade from a fraction of a pip to about a pip in active hours, simply because so many buyers and sellers are present at once. Step away from the majors and the picture changes fast: an exotic pair such as USD/TRY can run tens of pips, because the order book is thin. Forex also trades around the clock on weekdays, so spreads tighten through the busy London and New York overlap and widen in the quiet hours. The full picture is in the forex spread guide.
Crypto: the widest and most variable
Crypto shows the most dramatic range. Large coins like Bitcoin and Ethereum carry the tightest crypto spreads thanks to deep, constant demand, but they’re still wider than a major forex pair, and they sit against far higher volatility. Smaller tokens can cost several percent just to enter and exit. Two things set crypto apart: it trades 24/7, with no close to reset liquidity, and it’s fragmented across many venues rather than one deep pool, so the same coin can show a different spread in different places. Because prices vary so widely, crypto spreads are often read as a percentage rather than an absolute number. The crypto spread guide goes deeper.
Stocks: it depends on the company
Stock spreads live or die on the individual company’s liquidity. A blue-chip like Apple or Microsoft trades millions of shares a day, so its spread can be a single cent, a few hundredths of a percent. A thinly traded small-cap might show a spread of 1% to 2%, because few buyers and sellers are around to tighten it. Stocks are quoted in cents per share, which is why a percentage view helps when comparing them to other assets: a $0.10 spread on a $25 share is 0.4%. They also trade only during exchange hours, with the best prices set across venues, and spreads widen sharply in pre-market and after-hours trading, and during stress; in the March 2020 shock, spreads on major indices blew out far beyond their usual range. Most retail traders access shares as CFDs, where the spread works the same way. The stock trading guide covers the basics.
Why the differences all trace to liquidity
Strip away the labels and one factor explains the whole table: liquidity. The more active buyers and sellers in a market, the closer the bid and ask sit, because someone is always ready to take the other side. Forex majors have the deepest pool on the planet, so they’re tightest. Blue-chip stocks are deep within their trading hours. Crypto majors are deep but fragmented, and everything below the top names thins out quickly. Volatility pushes the other way in every market at once: when uncertainty spikes, market makers widen their quotes to cover the risk, which is why spreads balloon around news in forex, around earnings in stocks, and around sharp moves in crypto. Tight or wide, the spread is really just liquidity made visible.
What it means for you
The practical takeaway is the same across all three markets: the spread is a cost you pay on every entry and exit, so it matters far more the more often you trade. For a long-term investor holding for months, a wider spread is a one-off rounding error. For a scalper or day trader, it’s a recurring tax that can quietly decide whether a strategy makes money. That’s why active traders gravitate to the most liquid instruments, the assets with the tightest spreads, and trade them in their busiest hours. Whichever market you choose, judge the spread as part of the all-in cost alongside any commission and overnight fee, and read it in percentage terms when you want to compare one asset class against another.
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What is the bid-ask spread?
It's the difference between the bid price, where you can sell, and the ask price, where you can buy. The gap is the built-in cost of trading: you buy at the higher ask and can only sell at the lower bid, so a position starts slightly negative by the size of the spread.
Which market has the tightest bid-ask spread?
Forex, specifically the major pairs like EUR/USD. As the most liquid market in the world, it produces the narrowest spreads of any asset class. Highly liquid stocks and the largest cryptocurrencies are next, while exotic pairs, small-cap stocks, and minor coins are widest.
Why are crypto spreads wider than forex spreads?
Two reasons. Crypto liquidity is spread across many separate exchanges rather than one deep global market, and most coins trade far less volume than major currencies. Both leave fewer orders on the book, so the gap between bid and ask is wider, and it varies more from venue to venue.
How do you compare spreads across different assets?
Use a percentage rather than the raw number. A spread quoted in pips, cents, or dollars isn't directly comparable, but dividing the spread by the price gives a percentage that is. A $0.10 spread on a $25 stock is 0.4%, which you can line up against a forex or crypto spread expressed the same way.
Does the bid-ask spread matter for long-term investors?
Much less than for active traders. If you hold for months or years, paying the spread once is a minor, one-time cost. If you trade frequently, you pay it on every round trip, so it compounds into a significant drag on returns and deserves close attention.
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