Put a perpetual futures chart next to the spot chart for the same coin, and the prices almost never match. The perp sits a little above spot or a little below it. The gap keeps moving. That gap is the basis.
A hedged position can be built to collect it. The same gap can also be read as a gauge of how crowded one side of the market is. Both uses start with knowing what the number actually measures.
This piece explains what basis is, how it behaves on dated futures and on perpetuals, and how the classic hedged structure around it works. It stays provider-neutral and uses no market data. Nothing in it is a recommendation to put on a trade.
Key Takeaways
- Basis is the derivative price minus the spot price; a positive basis is called contango, a negative one backwardation.
- A dated future's basis is forced to close at expiry, while a perp's premium is only pulled toward the index by funding.
- Long spot plus short derivative removes most price direction but keeps funding, basis, liquidation, cost and venue risk.
- An annualized funding figure is quoted on notional, not on the full capital a hedged position ties up.
What Basis Actually Measures
Basis is the difference between the price of a derivative and the price of the asset it tracks. As a formula: basis = derivative price - spot price. It is often expressed relative to spot, as basis / spot price, so that coins with very different prices can be compared side by side.
In traditional markets the term usually refers to dated futures on commodities, bonds or indices. In crypto it applies to dated futures, which expire on a fixed date, and to perpetual futures, which never expire. The arithmetic is identical. The behavior is not.
For a perpetual, "spot" usually does not mean the price on one exchange. It means an index built from several spot markets, so that no single order book defines fair value on its own. How that index is assembled, and how it differs from the price your margin is checked against, is covered in mark price vs. index price.
Contango and Backwardation, in Plain Words
When the derivative trades above spot, the basis is positive and the market is in contango. Buyers pay extra to hold exposure through the contract instead of holding the coin. In crypto, that usually reflects more demand for leveraged longs than for shorts.
When the derivative trades below spot, the basis is negative and the market is in backwardation. That tends to appear when shorts are crowded, after a sharp sell-off, or when holders hedge their coins with short contracts.
Neither state is good or bad. Basis describes positioning, not direction. A market can stay in contango while price falls. It can sit in backwardation through a rally. If you read a wide premium as a price forecast, you are reading the wrong instrument.
Dated Futures vs. Perpetuals: Where the Gap Ends
A dated future settles against spot on its expiry date, in cash or by delivery. On that date the contract stops existing. Any basis it carries today has to be gone by then.
That fixed end point makes dated-futures basis predictable in one specific way. You know when the gap closes. You do not know its path until then.
A perpetual never expires, so nothing forces it to meet spot on any particular day. Its gap to the index is usually called the premium. It can widen, narrow or flip sign at any time. What keeps it from drifting off for good is funding, which has its own article on funding rates and is only summarized here.
| Question | Dated future | Perpetual |
|---|---|---|
| What closes the gap | Settlement at expiry | Funding payments, interval by interval |
| Is the end point known | Yes, the expiry date | No |
| Where a carry return comes from | The basis shrinking to zero | Funding received while the position is open |
| Can the position start costing you | Mainly if you close before expiry | Yes, whenever funding turns against your side |
The last row is the one that gets skipped most easily. With a dated future, the payoff of a hedged position is largely set at entry. With a perpetual, the income is a stream. And a stream can stop or reverse.
How Funding Pulls the Perp Toward the Index
Without an expiry, a perpetual needs another way to stay close to spot. That way is funding: a periodic payment exchanged directly between longs and shorts. When the perp trades above the index, longs pay shorts. When it trades below, shorts pay longs.
In most funding designs, the premium is an input to the rate itself. A wider premium tends to mean a larger payment. Funding does not move the price directly. It makes holding the side that pushes price away from the index more expensive, and it pays the side that pulls it back.
You never collect the premium itself. On a perpetual, a hedged trader collects the funding stream the premium generates, for as long as that stream lasts. If the premium collapses, the stream shrinks. If the premium flips sign, the stream flips direction.
The Cash-and-Carry Structure, Step by Step
Cash-and-carry means holding the underlying, the cash leg, and selling the derivative against it. With a dated future, the trader buys the coin spot and sells the same quantity of the future. Held to expiry, the price moves cancel out. What remains is the basis locked in at entry, minus costs.
With a perpetual, the structure looks the same on the surface. The trader buys the coin spot and opens a short perp of the same size. Price moves on both legs largely offset each other. While funding is positive, the short leg receives payments.
The return here is not fixed at entry. It is earned interval by interval. That is why this version is often called funding capture rather than a carry with a known payoff.
A few things are easy to miss when you first see the structure.
- The legs sit on different instruments, often on different venues, and they do not move in perfect lockstep.
- The spot leg ties up the full value of the coins, and the short leg needs its own margin on top of that.
- Nothing in the structure keeps funding positive. The hedge removes direction; it does not guarantee income.
Reading an Annualized Number Without Being Fooled by It
Basis and funding are often quoted as an annualized rate. That makes them easy to compare with other ways of holding capital. The arithmetic behind such a figure is simple.
For a dated future, you take the basis as a share of spot. Then you scale it up by how many times the remaining time to expiry fits into a year. For a perpetual, you take the current funding rate per interval and assume it is paid at every interval for a full year.
Both shortcuts hide assumptions. The dated-future version assumes you hold to expiry and nothing forces you out earlier. The perpetual version assumes the rate never changes. It will.
There is a second trap, and it sits in the denominator. Annualized rates are quoted on notional. The figure describes income relative to the size of one leg. A hedged position, however, ties up the full value of the spot coins plus the margin for the short leg.
Measured against everything you actually committed, the same income is a smaller share than the headline suggests. So whenever you see an annualized basis or funding figure, ask what it is measured against. Then ask how long the rate behind it has really lasted.
Where the Structure Breaks
The appeal of basis trading is that it looks neutral. The risks are real anyway. They just stop being about direction.
Funding flips against you
Positive funding depends on longs being the crowded side. When sentiment turns, funding can fall to zero or below. A short perp leg that was receiving payments starts paying them. Crowds rotate. A rate that looked stable for weeks can reverse quickly, and an annualized figure computed in the good weeks says nothing about the bad ones.
The basis widens before it closes
If the basis on a dated future widens after entry, the hedged position shows a loss on paper. Held to expiry, the gap still closes. Closed early, the loss is real. On a perpetual, a widening premium means the short leg loses more than the spot leg gains until the gap narrows again. There is no date on which it has to.
The short leg gets liquidated in a squeeze
In a sharp rally, the spot leg gains value, but that gain usually sits in a different account or on a different venue. The short perp loses margin in real time. It can reach its liquidation level before collateral is moved across. Then the hedge is gone.
What is left is a long spot position with no hedge, often near the top of the move. Leverage on the short leg moves that threshold closer. That is why a hedged position still needs margin management.
Fees and slippage hit both legs
Every entry and every exit happens on both legs. Costs double up. Trading fees and slippage on each come straight out of whatever the position earns. When the basis or the funding rate is small, those costs can absorb all of it. A structure that looked like income turns into a slow, hedged loss.
Venues, collateral and split capital
Running the legs on separate venues means carrying the operational risk of each: outages, paused withdrawals, changed contract terms. Margin is often posted in a stablecoin, which carries its own risk of losing its peg. And because the coins and the margin sit in separate places, moving funds between them takes time. A fast market does not give you that time.
What Basis Tells a Directional Trader
Even if you never run a hedged position, basis is useful information. A rising premium alongside positive funding says longs are paying up to stay in. Read it together with open interest. Open interest climbing while the premium widens usually means new leveraged longs are arriving, and more positions that a drop could force out.
Extreme readings describe crowding. Crowding is fuel for squeezes in either direction. That is context, not a trading signal. A stretched premium can stay stretched longer than a position can stay margined.
The practical use is defensive. Before you hold a perpetual through several funding intervals, look at which side of the basis you are on. If you are on the crowded side, you are likely the one paying. That cost runs against you even while the chart does nothing.
Basis on a CarrotFunding Account
A full cash-and-carry needs a spot leg and a derivative leg held side by side. This article does not describe running that structure on a CarrotFunding account. What it can describe is how the rulebook treats the perpetual side, because that is where basis and funding show up for you.
CarrotFunding runs its own trading platform, with Hyperliquid as the native execution venue. The venue-side conditions are listed on the Hyperliquid venue page.
That last clause matters for anyone thinking in carry terms. Funding paid on a crowded position reduces equity just like a losing trade. Trading fees count toward the daily loss and maximum loss limits too. A position that is flat on price can still move you toward a limit.
The rulebook also names a related structure. Its list of forbidden trading practices includes "Hedging across accounts", defined as "Opening opposing positions on the same instrument across two or more Challenge accounts to guarantee that one account passes while the other breaches." If you are considering splitting a hedge across your own challenge accounts, read that definition first.
Conclusion
Basis is the price of holding exposure through a derivative instead of the coin. On a dated future that price has a deadline, because settlement closes the gap. On a perpetual it has none, and funding is the only force pulling the contract back toward its index. The hedged structure turns that force into a stream you can collect, but only while the stream lasts and only if the short leg survives every squeeze in between. So the real decision is rarely whether the rate looks attractive. It is whether you can carry the costs and the margin of both legs through the moment the rate turns. If you trade direction only, the same gap is still worth watching, as a reading of who is crowded.
FAQ
Is basis trading risk-free?
No. Hedging spot with a short derivative removes most direct price exposure, but funding can turn against the short side, the basis can widen before it closes, the leveraged leg can be liquidated in a fast rally, and both legs carry fees, slippage and venue risk. The risk changes shape; it does not disappear.
What is the difference between basis and the funding rate?
Basis is a price gap: the derivative price minus the spot price. The funding rate is a periodic payment between longs and shorts on a perpetual contract. In most designs the premium feeds into the funding calculation, so the two tend to move together. One is a price, the other is a cash flow.
Can basis be negative?
Yes. When the derivative trades below spot, the basis is negative and the market is in backwardation. On a perpetual this usually comes with negative funding, so shorts pay longs. A long-spot, short-perp position then pays funding at every interval for as long as the rate stays below zero.
Why does a dated future converge to spot at expiry?
On its settlement date the contract is settled against the spot price, in cash or by delivery. Shortly before that moment it cannot trade far from spot, because anyone could buy the cheaper side and sell the dearer one and lock in the difference, and that buying and selling closes the gap.
Does a wide premium mean price is about to fall?
Not on its own. A wide premium shows that one side, usually longs, is paying to hold its exposure. That crowding can unwind sharply, but it can also persist for a long time while price keeps rising. Treat it as a description of positioning and cost, not as a timing signal.
