Crypto Cash and Carry Basis Trade

Thesis (edge)

A dated future is a contract to buy or sell a coin at a fixed price on a fixed future date. If bitcoin trades at 100 today and the future expiring in three months trades at 105, then someone is willing to pay a 5 percent premium for the privilege of getting their exposure in the future rather than now.

You can take the other side. Buy the coin at 100 in the spot market, sell the future at 105, and hold both until expiry. At expiry, the future must converge to the spot price. Whatever the coin is worth on that day, the gain on one leg cancels the loss on the other, and you are left with the 5 percent gap. Over three months, that is roughly a 20 percent annualized return, and it does not depend on whether bitcoin goes up, down or sideways.

This is the classic cash and carry trade, and it is older than crypto by a century. It exists in crypto in unusually generous form because the demand for leveraged long exposure has been persistent, structural, and largely unsatisfied by traditional lenders. Somebody has to be the patient seller. That is the role you are being paid for.

The word arbitrage gets used here freely. It should be used carefully. The payoff is mathematically locked only if both legs are honoured, and in crypto that assumption has failed in expensive ways.

Where it works (regimes)

The basis is widest during bull markets and speculative frenzies. In late 2020 and early 2021 the annualized basis on major venues reached levels that would be unthinkable in any mature market, because the eagerness to hold leveraged long positions overwhelmed the supply of capital willing to short.

The basis compresses when enthusiasm fades, and in genuine bear markets it can go negative, meaning the future trades below spot. At that point the trade reverses: you would short the coin and buy the future, though shorting spot crypto is harder and more expensive than being long, so the reverse trade is less accessible in practice.

The pattern to internalize is the same one that runs through every carry strategy on this site. The return is highest exactly when the underlying market is most speculative and most fragile. The basis is not a free lunch that happens to be lying around. It is a payment for standing on the risky side of a crowded, leveraged market.

Signals

• Annualized basis: the percentage gap between future and spot, converted to an annual rate by scaling for the time remaining. A 2 percent gap with one month to expiry is far more attractive than a 4 percent gap with six months to run, and only the annualized figure makes that comparison correctly.
• Days to expiry: as expiry approaches the basis mechanically shrinks toward zero. That convergence is the return. It also means the same gap earns you less and less as time passes, so entry timing matters.
• Term structure: compare the basis across the front, second and third contracts. A far-dated contract sometimes offers a better annualized return with less rollover risk than the crowded front month.
• Cross-venue dispersion: the basis differs across exchanges. A wider basis usually reflects a weaker counterparty, not a better opportunity, and treating it as free extra return is how people end up with a large position on a venue that later collapses.

Portfolio construction

The trade is long spot and short future in matched size. The net exposure to the coin's price is close to zero.

The central design problem is collateral. The short future position loses money on paper whenever the coin rallies. The long spot position gains an exactly offsetting amount, but the exchange holding the short does not care about assets it cannot see. If your spot is on a different venue, or in self-custody, you can face a margin call on a position that is economically flat.

There are two ways to handle this. Use a venue that lets you post your spot holding as collateral against the short, so the two legs offset within the same margin system. Or hold a very large excess of free collateral against the short leg, sized to survive a violent upward move. Crypto has produced 40 percent moves in a week. Size accordingly.

The choice of venue is the highest-stakes decision in the strategy. Regulated futures, such as those listed on CME, offer a smaller basis and therefore a lower return. They also offer clearing, segregation and a counterparty that is not going to disappear overnight. The extra yield on offshore venues is not alpha. It is the fee you are charging for taking on that counterparty risk, and it should be evaluated exactly as such.

Risk model

The terminal payoff is fixed. The path is not, and it is the path that hurts.

• Mark-to-market risk: the basis can widen before it converges. If you entered at a 5 percent premium and it goes to 9 percent, you have an unrealized loss, even though holding to expiry still delivers the original 5 percent. If that unrealized loss triggers a margin call you cannot meet, you are forced out and the paper loss becomes a real one.
• Margin and liquidation on the short leg, as described above. This is the most common practical failure.
• Exchange insolvency. This is the risk that actually ends the strategy. Every participant in the crypto basis trade who was using FTX in November 2022 had a perfectly hedged, mathematically sound position, and it did not matter. The trade was fine. The exchange was not.
• Withdrawal freezes, which can trap the spot leg while the future leg needs collateral.
• Settlement mechanics. Understand exactly how your contract settles, against which index, and what happens if that index misbehaves during a flash crash.

The correct mental model is that you are earning a spread for lending balance sheet to a leveraged market through an intermediary whose failure probability is not small. Price the position with that failure probability included.

Costs & implementation

Fees on both legs, spread on entry and exit, and the opportunity cost of capital tied up for the full holding period. Because the trade requires capital on both sides, it is capital-intensive relative to the return it generates.

Capacity is meaningfully constrained. Shorting the future in size compresses the basis, which is the return. The trade is self-limiting, and the wide historical spreads existed precisely because not enough professional capital was willing to touch these venues.

Operationally, expect to manage collateral actively, monitor margin continuously, and have a documented plan for rapid unwind. This is not a set and forget position.

Failure modes

• Calling it arbitrage and therefore not sizing it as a risk position.
• Choosing the venue with the widest basis, which is a direct selection for counterparty fragility.
• Being liquidated on the short leg during a rally because collateral was thin, thereby losing money on a trade that was structurally flat.
• Ignoring the mark-to-market path and assuming the terminal payoff is all that matters. It is only all that matters if you survive to collect it.
• Failing to account for the full cost of capital and concluding the annualized return is far higher than it is.
• Backtesting the basis as a pure spread series without modelling margin calls, fees, or the possibility that the exchange simply stops honouring the contract.

Our Notes & Suggestions

If you want to study this trade, study the CME version first. The basis is smaller, the mechanics are cleaner, and the counterparty is a regulated clearinghouse. Understanding why the offshore basis is so much wider than the CME basis teaches you more about the strategy than any backtest will, because that difference is a direct market price of counterparty risk, quoted daily.

For a smaller book, the discipline that matters most is a hard cap on exchange exposure. Decide the maximum share of capital you are willing to lose entirely, put no more than that on any one venue, and treat that number as inviolable even when the basis is screaming at you to add more.

The trade is genuinely elegant and the economics are genuinely real. The people who lost everything in this trade were not wrong about the mathematics. They were wrong about who was holding their money.