The Crypto Cash-and-Carry Basis

Bitcoin trades at $60,000 on spot exchanges. A three-month futures contract on the same coin trades at $61,500. Nothing about that gap requires believing bitcoin will actually be worth $61,500 in three months — it is simply the market's price for holding the coin versus committing to deliver it later, and that gap can be captured directly.

Building the trade

The mechanics mirror the classic cash-and-carry arbitrage from traditional commodities and index futures, adapted to crypto's fragmented, always-on market. A trader buys $1 of bitcoin on spot and simultaneously sells $1 notional of a bitcoin future expiring in three months. From that moment, the position's value no longer depends on where bitcoin's price goes — a rise in spot is offset almost exactly by a loss on the short future, and vice versa. What's left is the fixed dollar gap between the two entry prices, realized as the future converges to spot at expiry.

The annualized return on this trade is the basis expressed as a rate:

$$r_{basis} = \left(\frac{F}{S} - 1\right) \times \frac{365}{t}$$

In words: take the percentage gap between the future and spot price, then annualize it by scaling for how many days until the future expires — turning a one-off price gap into a rate comparable to a money-market yield.

Worked example

Spot BTC is $60,000, the 90-day future trades at $61,500. The raw basis is $61{,}500/60{,}000 - 1 = 2.5\%$ over 90 days. Annualized: $2.5\% \times (365/90) \approx 10.1\%$. A trader with $1 million buys spot bitcoin and sells $1 million notional of the future. Whether bitcoin ends the quarter at $50,000 or $75,000, the future converges to spot at expiry and the trader nets close to the $25,000 basis captured at entry — roughly 10% annualized, funded from an asset that itself paid no yield while held.

What this means in practice

This is why the crypto basis trade became a favored strategy for institutional desks: it converts bitcoin's price volatility, which most funds don't want on their books, into something closer to a fixed-income-like yield. It only works cleanly, though, if a trader can actually hold the spot position and post the future without excessive margin costs, and if the venues involved don't fail — a risk traditional cash-and-carry trades in Treasuries or gold don't carry to the same degree.