Open an order book and two prices sit right next to each other at the top. One is the most anyone will pay you for the asset right now. The other is the least anyone will sell it to you for. Two prices. One gap.
That gap looks small and easy to ignore, and it is part of every trade you make.
That pair is the bid and the ask. The words are familiar. What they describe is easy to misread: two separate offers from two separate groups of traders, with your order deciding which one you meet.
This piece stays provider-neutral on the mechanics, because bid and ask work the same way on any venue that runs a live order book. Where Hyperliquid or CarrotFunding's own handling matters, the article says so directly.
Key Takeaways
- The bid is the highest price a buyer is currently offering, and the ask is the lowest price a seller is currently accepting.
- When you sell at market you meet the bid, and when you buy at market you meet the ask.
- The spread is the gap between the best bid and the best ask, and crossing it costs you before any fee is charged.
- The mid price sits between the bid and the ask, but it is a reference point, not a price an order fills at.
- On CarrotFunding, the spread is not marked up: trading conditions reflect the live Hyperliquid environment.
What the Bid and the Ask Actually Are
The bid is the highest price at which someone currently wants to buy. It is a standing offer from a buyer, resting on the book and waiting for a seller to accept it. If you want to sell right now, the bid is the best price available to you.
The ask, sometimes called the offer, is the lowest price at which someone currently wants to sell. It is a standing offer from a seller, waiting for a buyer. If you want to buy right now, the ask is the best price available to you.
The naming trips people up because it is written from the other side of the trade. The bid is where you sell. The ask is where you buy. Mind the direction. Both words describe what the resting order wants, not what you want.
Neither price belongs to the exchange. Each one is simply the best of the orders other traders have placed and left waiting. That makes both of them live. An order gets added, cancelled, or filled, and the best bid or the best ask can change in that same moment.
Reading Bid and Ask in the Order Book
On a central limit order book, resting orders are sorted by price into two stacks. Sell orders sit on one side, ordered from the lowest asking price outward. Buy orders sit on the other side, ordered from the highest bid outward.
The usual layout draws the asks above and the bids below, with the two best prices facing each other in the middle.
That meeting point is the top of the book: the best bid and the best ask, often with the spread printed between them. Next to each price level you see a size, meaning how much is resting there. A price with almost nothing behind it is a much weaker promise than a price with real size.
This is where reading the top of the book stops being enough. The best ask only tells you what the first slice of a buy costs. A larger order uses up that level and moves on to the next one, at a worse price. That depth problem is what slippage covers in its own piece, so it is not repeated here.
For the bid and ask question, keep one point in mind. The quote at the top is the price of a small order, not the price of any order you might want to place.
The Spread: The Gap Between the Two Prices
The spread is the distance between the best ask and the best bid, or spread = best ask − best bid. It exists because buyers and sellers have not agreed yet.
If a buyer were willing to pay what a seller asks, those two orders would match and leave the book. What stays behind is, by construction, a gap.
A tight spread means the best buyer and the best seller are close together. That is typical of a busy market, where many traders keep orders near the current price. A wide spread means they are far apart. Fewer resting orders and sudden moves both tend to push the two sides away from each other. Wide spreads cost more.
The spread is easier to judge in relative terms than in absolute ones. The same price gap is large on a cheap asset and tiny on an expensive one. What matters for you is how big the gap is compared with the price, and compared with the move you are trying to catch.
A spread also changes from one moment to the next. Unlike a fee, it has no schedule. The spread is a live measurement. It widens and narrows with the book itself, which is why it is worth checking when you are about to trade, not only when you are planning the trade.
Why You Never Get the Mid
The mid price is the point exactly between the best bid and the best ask. It often appears on charts and price feeds, because it gives a tidy single number to an asset that really has two prices. It is useful as a reference. It is not a price you can trade at.
A market buy takes the ask. A market sell takes the bid. Never the mid.
No order that crosses the book lands at the midpoint, because nobody has an order resting there. The mid is a calculation, not an offer. You can place a limit order at the midpoint, but the moment it rests there it becomes the new best bid or best ask, and the midpoint moves with it.
This is also why a position starts slightly behind the moment you open it. Buy at the ask, and the best price you could sell at in that same instant is the bid, which is lower. Whatever price your screen uses to value the position, the price you could actually exit at right now sits on the other side of the spread.
In most perp designs, an open position is valued against a separate reference, the mark price. It has its own logic and its own job, explained in mark price vs index price. No one sends you a bill for the gap between bid and ask. You paid it anyway, by crossing the book.
The Spread as a Cost You Pay Up Front
A trading fee shows up as a line next to your fill. The spread does not. It is built into the price you get, so it is easy to treat as if it were not there at all.
Think of it as a round trip. If you bought at the ask and sold straight back at the bid, with nothing else changing, you would lose exactly the spread. Every trade that crosses the book on the way in and again on the way out pays that gap once in full.
Your position has to move at least that far in your direction before it is back where it started, and the fee comes on top.
That cost scales with how often you trade. Every crossing of the book costs something. One crossing is small. Then it adds up. A strategy built on many quick trades with small targets crosses the spread again and again, and the spread can end up larger than the profit it was chasing. The tighter your target, the bigger the spread looks next to it.
The spread is also separate from the other two costs that touch the same trade. Fees depend on whether your order added or took liquidity, which is the subject of maker vs taker fees. Slippage is what happens when your size goes past the top of the book. The spread is the cost that even a small order pays at the very first level.
If you trade on a firm's account rather than your own, it is worth knowing whether the spread you see is the market's own.
Bid, Ask, Mid, and Last Are Not the Same Number
A trading screen shows several prices, and they answer different questions. Mixing them up is how a chart can say one thing while your fill says another.
| Price | What it is | Can a new order fill there right now? |
|---|---|---|
| Bid | The highest resting buy order | Yes, if you sell at market |
| Ask | The lowest resting sell order | Yes, if you buy at market |
| Mid | The point between bid and ask | No, it is a calculation |
| Last | Where the most recent trade happened | Only if an order is still resting at that price |
The last price deserves a second look. It records a trade that already happened, on whichever side that trade hit. A chart built from last prices therefore jumps between bid and ask as buyers and sellers take turns crossing, even when the book itself has barely changed. That jitter is the spread showing through the chart.
Choosing Which Side You Pay
You do not have to cross the spread. You can also wait. A buy limit order placed below the current ask does not match on arrival. It rests on the book and joins the bid side. If it sits at a better price than the current best bid, it becomes the new best bid, and the spread narrows by the amount you improved it.
That is the other way to trade the same two prices. Instead of paying the spread, you wait for someone else to cross it toward you. The price for that is uncertainty. Your order may never fill, and the market can move away while you wait. The full trade-off between the two approaches sits in market order vs limit order.
A practical habit follows from this. Before you place an order, look at the top of the book: the best bid, the best ask, and the size sitting at each. That tells you what crossing would cost right now and whether waiting on one side is realistic for the size you have in mind.
What This Means on CarrotFunding
CarrotFunding uses Hyperliquid's fully on-chain central limit order book as its execution venue, and trades match by price-time priority.
During a challenge, you trade in a simulated trading environment reflecting live trading conditions of that venue. Trades there reflect live conditions, including real-time pricing, slippage, spreads, and execution logic. The venue itself is described on the Hyperliquid venue page in the docs.
The spread itself is passed through, not padded.
The spread you cross still counts in your results, through the fill price. You pay standard Hyperliquid maker/taker fees, those fees are taken from your account and included in your P&L, and they count toward your daily loss and maximum loss limits.
A fill on the far side of the book moves your equity in the same way, because equity is balance plus unrealized P&L and your equity limits apply to both realized and unrealized losses.
Conclusion
Bid and ask are not two names for one price. They are two offers from opposite sides of the market, and the gap between them is a cost that every crossing of the book pays before price has moved at all. That makes the spread part of the trade, not background noise. Compare it with your target rather than with the price, and decide on purpose whether a given trade should pay it now or wait on the book for someone else to pay it. A strategy that cannot clear the spread with room to spare has a problem no entry signal will fix.
FAQ
Why did my sell stop fill below my stop price?
A sell stop usually becomes a market order once it triggers, and a market sell fills at the bid. If the trigger watches the last price or the mark price, the bid can already sit below your level at that moment, and a thin book can push the fill lower still. The order mechanics are covered in stop-loss basics.
Does leverage make the spread more expensive?
Leverage does not change the spread itself; the gap between bid and ask is the same whatever margin you post. It changes how much that gap weighs. With a larger position on the same margin, the spread you cross is a bigger share of the money at risk, so a cost that looks trivial on the chart can matter against your margin.
Why does the spread often widen right before a sharp move?
Traders who rest orders near the price carry a risk: if the market jumps, their order fills at a price that is suddenly stale. When a move looks likely, resting orders tend to be cancelled or moved further from the price. Fewer orders near the top of the book leave a wider gap between the best bid and the best ask.
Can I see how much spread I paid on a trade?
Not as a separate line. Your fill shows the price you got, not the gap you crossed. To see it, compare your fill with the mid at the moment you traded. A market buy fills above the mid and a market sell fills below it, and the distance between your fill and the mid is the share of the spread that entry cost you.
