What Is Basis Trading?

Basis trading is a market-neutral strategy that tries to capture the price gap, or the basis, between an asset’s spot price and the price of a futures contract on that same asset. A trader buys the asset on the spot market and sells an equal-sized futures contract, then waits for the two prices to meet. Direction barely matters. What matters is the spread.

In crypto, most people call it the cash-and-carry trade. The name comes from commodities, where you literally buy something, carry it (pay to store and finance it), and deliver it against a futures contract later. This is an educational explainer, not financial advice. Rules and tax treatment differ by jurisdiction, and you should consult a qualified professional before acting.

What exactly is the basis?

The basis is the difference between a futures price and the spot price at one moment. Write it as futures minus spot. When futures trade above spot, the basis is positive, a market state called contango. When futures sit below spot, the basis is negative, which traders call backwardation.

Here is the part that makes the trade tick. At expiry, a dated futures contract must settle at the spot price. So the gap has to close. That closing process is called convergence, and it is the engine behind every basis trade.

How does a cash-and-carry trade work?

Picture a positive basis. Futures are richer than spot. A basis trader does two things at once:

• Buys the asset on the spot market (the long leg).
• Sells, or shorts, the same quantity in futures (the short leg).

Now the position is hedged. If the price crashes, the spot loss is offset by a futures gain. If it rips higher, the futures loss is offset by a spot gain. The trader is not betting on price. They are betting that the futures premium will erode toward zero as expiry approaches, and pocketing that premium when the legs converge.

The reverse trade exists too. In backwardation, futures sit below spot, so a trader could short spot and buy futures. In practice that reverse cash-and-carry is harder in crypto, because borrowing coins to short them is fiddly and expensive.

Where does the return actually come from?

From the premium. Nothing more romantic than that. If a three-month future trades 5% above spot, and you lock both legs, that 5% is roughly your gross return over three months, assuming you hold to expiry and the legs stay balanced. Annualize it and it looks bigger. That annualized figure is what people mean when they talk about the yield on a basis trade.

Perpetual futures add a twist. Perps never expire, so there is no fixed convergence date. Instead they use a funding rate, a periodic payment between longs and shorts that tugs the perp price back toward spot. A trader who is long spot and short a perp collects funding whenever it is positive. Same idea, different plumbing.

Cash-and-carry vs reverse cash-and-carry

The two mirror each other. This table lays out the difference.

Why do people call it market-neutral?

Because the two legs cancel most of the price risk. You are not really long Bitcoin or short Bitcoin. You are long the spread. That is why basis desks describe the payoff as closer to a fixed-income return than a directional bet, since the profit is defined up front, provided everything holds together.

And that phrase, provided everything holds together, is doing a lot of work. It rarely all holds together.

What are the risks?

Plenty. Market-neutral is not risk-free, and this is where people get burned.

Liquidation risk. The short futures leg uses margin. If price spikes hard, that leg can be liquidated before convergence, leaving you long spot in a position you never wanted. Convergence cannot rescue a leg that was already closed out.

Funding flips. On perpetuals, funding can turn negative. Suddenly the payment you were collecting becomes a payment you owe, and the yield evaporates.

Counterparty and custody risk. Your collateral usually sits on an exchange. If that venue freezes withdrawals or fails, the hedge is worthless. The 2022 exchange collapses made that lesson expensive for a lot of people.

Cost drag. Fees, slippage, and the spread between the two legs all nibble at a return that was thin to start with.

Regulators treat the futures side as a derivative. In the United States the Commodity Futures Trading Commission oversees crypto futures as commodity derivatives, so the venue, your eligibility, and your tax reporting all depend on where you live.

Is basis trading the same as arbitrage?

Sort of, but be careful with the word. True arbitrage is riskless and instant. A basis trade is closer to convergence arbitrage: the profit is likely, not guaranteed, and you have to hold the position for weeks or months while risks pile up. Calling it low-risk arbitrage oversells it.

Who actually runs these trades?

Mostly desks that can watch positions closely and move fast: proprietary trading firms, market makers, and some larger funds. The reason is simple. The premium on any single trade is usually thin, so the strategy leans on size, low fees, and tight execution to be worth the effort.

Retail traders can attempt it, but the edge shrinks once ordinary fees and slippage are counted, and the operational demands are higher than they look. Managing two legs across spot and futures, tracking margin, and reacting to funding shifts is a full-time job, not a set-and-forget one.

None of this suggests the trade is right or wrong for anyone. It only sketches who the mechanics tend to suit, and why the returns that read so cleanly in a spreadsheet are harder to hold onto in practice.

The bottom line

Basis trading captures the gap between spot and futures prices, betting the gap will close rather than betting on direction. The mechanics are old and well understood; the crypto version simply swaps commodities for coins and adds funding rates and perpetuals. The returns can look steady on paper. The risks (liquidation, funding reversals, exchange failure) are real, and they can wipe out a season of thin premium in a single bad hour. None of this is a recommendation to trade. It is a description of how the mechanism works, and the rules around it vary by country.