Crypto Basis Trade Explained: How Cash-and-Carry Works

Short answer: Basis is the gap between a futures price and the spot price for the same asset, measured at the same moment. If a bitcoin future trades at $102,500 while spot trades at $100,000, the basis is $2,500. A cash-and-carry trade tries to collect that gap: buy the asset in the spot market, sell the same amount of the future, and hold both legs until the future expires. At expiry a dated future settles against a spot reference price, so the gap closes to near zero and the trader keeps the difference, minus fees, financing, margin costs, and roll costs if the position is extended. The trade has no directional bet in it. It has plenty of other risks, and most of this guide is about those.

Basis trading gets described as arbitrage, and the word makes it sound automatic. It is not. The two legs sit in different places, settle by different rules, and one of them can demand more margin at the worst possible moment. Professional desks run this trade at scale because they have cheap execution, deep margin buffers, and systems that watch both legs around the clock. A reader who understands the mechanics can still learn a lot from the basis itself, because the number is one of the cleanest public readings of how much the market is paying for futures exposure over spot.

What Basis Is, in One Formula

Basis = Futures price - Spot price

Three properties follow from that definition, and each one trips people up.

First, basis needs a matched pair. The futures price and the spot price must refer to the same asset, the same currency, and roughly the same timestamp. Comparing a CME future that settles against the CME CF Bitcoin Reference Rate (BRR) with the last trade on one small spot exchange mixes two different spot definitions. CME describes the BRR as a once-a-day reference rate built from trade flow on major bitcoin spot exchanges during a one-hour window, published as of 4 p.m. London time. Your spot leg trades wherever you bought it. The small gap between your venue and the settlement benchmark is part of the trade, not a rounding error.

Second, basis is quoted for a specific expiry. A future expiring in 30 days and a future expiring in 180 days are different contracts with different prices. A single number called "the basis" without an expiry attached is incomplete.

Third, the sign has names. Futures above spot is called contango, and the basis is positive. Futures below spot is called backwardation, and the basis is negative. CME's own education material explains the usual positive case this way: a futures contract carries an embedded cost of carry to expiry, which CME calls the implied financing of the contract, and the gap tends to grow with time to expiration and shrink as expiration approaches, until the contract converges and settles to the reference rate.

Annualized Basis: the Only Fair Comparison

A $2,500 gap sounds large or small depending on how long you must hold the trade to collect it. Annualizing puts contracts of different lengths on one scale:

Annualized basis (simple) = (Futures - Spot) / Spot x (365 / Days to expiry) x 100%

The table below uses one fixed spot price and varies the futures price and the time left. Every figure is hypothetical and was recomputed for this guide. The method is simple interest, no compounding, which is the convention most public basis dashboards use.

Read the third and fourth rows together. The 180-day contract offers twice the dollars of the 90-day contract, but a lower annualized rate, because you tie up capital for twice as long to earn them. Desks comparing a basis trade against a Treasury bill or a money market yield compare annualized numbers, after costs, for exactly this reason. The last row is backwardation: the future trades below spot, the cash-and-carry direction loses money before costs, and the profitable direction, if any, is the reverse trade covered later in this guide.

Two reading rules:

How Cash-and-Carry Works, Step by Step

The dated-futures version runs in a fixed order:

A Worked Example With the Arithmetic Shown (Hypothetical)

All prices in this section are round hypothetical numbers chosen so the arithmetic can be checked by hand. They are not market quotes and not a recommendation.

Setup, 90 days to expiry:

Now run two opposite expiry outcomes. The future settles against its reference price at expiry, and assume for this illustration that your spot sale price matches that settlement price exactly. Real trades carry a small mismatch here, covered in the risks section.

The combined gross result equals the entry basis in both rows. That equality is the entire appeal of the trade: the directional moves cancel, and what remains is the gap you locked at entry. It is also where the sales pitch usually stops, so keep going.

Costs decide the real result. Suppose, again hypothetically and only as an illustration of the categories, that the round trip costs $350 in total: spot and futures trading fees, the spreads crossed on entry and exit, and transfer or custody charges. Then:

That 8.72% is return on the spot capital. It is not return on margin, because margin requirements differ by venue, contract, and account type, and quoting a return on margin without naming those terms would inflate the result. It also assumes no margin call forced an early exit, no roll was needed, and the spot leg could be sold at the settlement price. Each assumption is a risk section below.

Dated Futures vs. Perpetuals: Two Different Carry Trades

Everything above used a dated future, a contract with an expiry. Crypto also offers perpetual futures, which never expire and stay near spot through funding payments instead of settlement. The two create different trades that share a name and little else.

In the perpetual version, the trader buys spot and shorts the perpetual, then collects funding while funding stays positive. Our funding rates guide works through the formula the large venues use, the 8-hour settlement rhythm on the biggest venue, and why a positive rate means longs pay shorts. The structural difference matters: a dated future promises convergence on a date you can circle, because settlement forces it. A perpetual promises nothing about any future date. Its premium can stay wide, shrink, or invert for reasons that have nothing to do with your entry, and your income depends on a rate that resets every interval. Desks run both. They size and monitor them differently, and so should anyone copying the shape of the trade.

A second difference hides in open interest. Basis inventory adds large, steady positions to futures open interest without expressing a directional view. Our open interest guide covers this distortion directly: when hedged carry inventory grows, aggregate open interest rises while nobody in that inventory is betting on direction at all. A rising open interest print during a wide-basis period may be carry desks building, not speculators piling in.

Who Runs This Trade, and Why the Basis Exists at All

If cash-and-carry collects a gap, why does the gap survive long enough to collect? Because closing it requires capital, margin, operational access to both markets, and tolerance for the risks in the next section. The basis is the market's payment for supplying those things. The regular suppliers are:

The common thread: the persistent basis is not a mistake in the market. It is a price for balance sheet, margin funding, venue access, and the risk that the trade goes wrong in ways the next section lists.

The Real Risks, in the Order They Usually Bite

1. Basis compression and the opportunity-cost trap

Your gross result is fixed at entry only if you hold both legs to expiry and nothing forces you out. The market can compress the basis for the next trade to near zero, and it can also widen the basis sharply against a position you already hold. Widening does not change your expiry math if you can hold on. It changes your margin balance today, which leads to the next risk. Compression matters most at roll time: the trade that paid 10% annualized for one quarter may pay 3% for the next, below cash alternatives, after you have built the operational habit of rolling it.

2. Margin and liquidation on the futures leg

The futures leg loses money in cash, daily, when price rises, even though the spot leg is gaining the same amount on paper. If the account cannot meet a margin call, the venue can close the short future. Then the hedge is gone, the spot leg is unprotected, and the "locked" basis was never locked at all. This is the single most common way a hedged trade becomes a directional loss. Our liquidations guide explains how margin balance against maintenance margin triggers forced closing, and why liquidation runs on a mark price rather than the last trade. Basis traders manage this with large cash buffers held specifically for margin top-ups, sized for a strong rally, not for an average week. Cross margin versus isolated margin changes how much of an account one leg can put at risk; our cross vs. isolated margin guide works through that choice with examples.

3. Exchange and counterparty risk

The two legs usually sit at different venues, and each venue is a counterparty. A spot exchange halt, a futures venue outage during a fast move, or a failure at either one can leave a single naked leg open while you cannot trade the other. Regulated futures clearing reduces one side of this risk and does not remove the spot side. A trade that is hedged on a spreadsheet is only hedged while both venues are open, solvent, and letting you trade.

4. Settlement mismatch

A CME future settles to the BRR, built from a basket of spot exchanges over a set window. A crypto-native dated future may settle to its own index, in Deribit's case described as an average of spot markets over a 30-minute window into expiry. Your spot leg sits at your price, on your venue. In calm markets the mismatch is small. In a fast expiry-hour market it can take a real bite out of a basis that looked fully priced, and it never appears in the headline annualized number.

5. Roll costs and roll timing

Extending the trade means closing one futures position and opening another, crossing spreads and paying fees on both, at prices set on roll day. Liquidity concentrates in the near contract and migrates as expiry approaches, so rolling late can mean trading the thin contract. Each roll also re-prices the whole trade: there is no rate lock beyond the current expiry, ever.

6. Execution and leg risk at entry

The two legs rarely fill at the exact instant at the exact prices on your screen. Enter the spot leg first and the futures price can move before the short is on; enter the future first and you hold a naked short until the spot buy fills. Desks reduce this with paired order types and by trading when both books are deep. A wide spread on either leg at entry comes straight out of the basis.

7. Capital lockup and funding cost

The spot leg ties up its full purchase price for the life of the trade, and the futures leg ties up margin that cannot be spent elsewhere. If the cash was borrowed, the borrow rate is the hurdle the net basis must beat, and a basis below that rate loses money slowly and safely-looking. Even with your own cash, the comparison is against what that cash would earn in a Treasury bill or money market fund over the same days. A 6% gross basis against a 5% cash alternative is a thin payment for the five risks above it.

The Reverse Trade: Backwardation

When futures trade below spot, the mirror position is reverse cash-and-carry: sell or borrow the spot asset, buy the future, and collect the negative basis as the future converges up to spot at expiry. It appears less often in bitcoin, usually during forced selling or heavy hedging demand for short exposure through futures. It is harder to run than the standard direction for practical reasons: borrowing spot bitcoin costs money and can be recalled, the borrow rate moves, and some participants cannot short spot at all. A negative annualized basis on a screen is therefore not automatically a trade. Often it is the market charging for scarce borrow, and the charge is the reason the gap persists.

Reading the Basis Without Trading It

You do not need to run this trade to use the number. Read as market data, the basis answers a narrow question: how much is the market paying, right now, for futures exposure over spot, at this expiry? A widening positive basis alongside rising open interest and positive funding describes demand for leveraged long exposure building across both dated and perpetual books. A basis pinned near zero in a quiet market describes the opposite: nobody needs to pay up for futures exposure, and carry desks have competed the spread down to their cost floor. A flip into backwardation during a selloff records futures being sold harder than spot, which has historically matched hedging and forced deleveraging rather than calm positioning. None of these readings predicts price. Each one describes who is paying whom to hold exposure, which is the information the basis actually contains.

Compare venues before trusting one print. A basis computed from a thin futures book or a stale spot price can be wide on a screen and impossible to trade at size. The executable basis is the one net of the spreads you would actually cross, on both legs, at your size.

A Pre-Trade Basis Checklist

Run through this before opening any cash-and-carry or funding-carry position:

Frequently Asked Questions

Is cash-and-carry risk-free?

No. It removes most directional price risk when both legs stay on, in equal size, to expiry. It keeps margin risk on the futures leg, counterparty risk at both venues, settlement mismatch, execution cost, and the chance that a forced exit breaks the hedge at the worst moment. Market-neutral and risk-free are different claims.

Why does the basis not get competed down to zero?

Because collecting it requires capital for the spot leg, margin and a buffer for the futures leg, accounts at two kinds of venues, and staff or systems to run it. The remaining spread is the payment for those inputs. It compresses toward the all-in cost of the cheapest large supplier, not toward zero.

Can I run this trade with a spot ETF as the spot leg?

Institutions do pair ETF shares with short CME futures, since both legs sit inside regulated markets. The pairing adds its own frictions: ETF shares trade only during market hours while crypto trades continuously, the fund charges an expense ratio that drags the spot leg, and share creation and redemption runs through authorized participants rather than the holder directly. The basis math is the same; the operating details are not.

What happens if the price rallies hard while I hold the trade?

Your spot leg gains value and your short future loses it, roughly dollar for dollar on a matched size. The futures loss is settled in cash as it accrues, so the practical question is liquidity: can you fund the margin account through the rally until expiry, when the two legs net out? Desks that cannot fund that path get stopped out of a trade that would have finished fine.

How is basis different from funding?

Basis is a price gap between a dated future and spot, collected once as the contract converges at expiry. Funding is a recurring payment between long and short holders of a perpetual contract, which has no expiry and no settlement convergence. A perpetual carry trade collects funding; a dated cash-and-carry trade collects basis. The two rates often move together because both price demand for long futures exposure, but they are paid by different mechanisms on different schedules.

Why did my annualized basis change after I entered?

It did not, for the position you hold: your gross basis was set by your two fills. What changed is the basis on new trades and on the next expiry, which is the rate you will get if you roll. Confusing the locked entry basis with the live screen basis leads traders to expect a rate at roll time that the market no longer offers.

Should a beginner run a basis trade?

The mechanics are a good thing to learn, and the number is a good thing to watch. Running the trade is an operational business: two venues, margin monitoring, roll discipline, and cost control decide the result more than the entry spread does. A beginner who cannot yet state their all-in cost per round trip, or who has no reserve buffer for a margin call, is not collecting arbitrage. They are holding a leveraged short future with a spot purchase attached and hoping the operational parts go well.

Sources and Method

This guide was published October 22, 2026. Contract specifications, settlement methods, and margin rules are venue-specific and change; check the current contract page and rulebook for any contract you trade. Every price in the worked examples is a labeled hypothetical chosen for checkable arithmetic, not a market quote. No live basis figure is stated as a current fact anywhere in this guide.

This article is educational research, not investment advice and not a recommendation to run a basis trade. A hedged structure can still lose money through margin calls, venue failure, settlement mismatch, and costs. Verify current contract terms with the venue and consider consulting a qualified financial professional before trading futures.